
	Where results make sense

Topic: Unconventional superconductors

Related Topics

Superconductivity

BCS theory

Copper

Copper

In the News (Tue 22 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	9th Symposium of High Temperature Superconductors in High Frequency Fields - HTSHF 2006
		AGASSI YD Theory and measurement of the nonlinear response of a superconductor thin film to a microwave frequency radiation field
		Discerning intrinsic and extrinsic nonlinearities in the microwave response of superconductors
		Dielectric resonators for surface impedance measurement of superconductor thin films in magnetic fields at high microwave frequencies
	www.htshff.bham.ac.uk /programme.html (619 words)

	Superconductivity - Wikipedia, the free encyclopedia
		In conventional superconductors, superconductivity is caused by a force of attraction between certain conduction electrons arising from the exchange of phonons, which causes the conduction electrons to exhibit a superfluid phase composed of correlated pairs of electrons.
		Superconductors are also able to maintain a current with no applied voltage whatsoever, a property exploited in superconducting electromagnets such as those found in MRI machines.
		In a class of superconductors known as type II superconductors (including all known high-temperature superconductors), an extremely small amount of resistivity appears when an electrical current is applied in conjunction with a strong magnetic field (which may be caused by the electrical current).
	en.wikipedia.org /wiki/Superconductor (2566 words)

	Unconventional superconductor - Wikipedia, the free encyclopedia
		Unconventional superconductors are materials that display superconductivity but that do not conform to BCS theory or its extensions.
		The first unconventional superconductor was discovered by J.G. Bednorz and K.A. Müller in 1986.
		These include some that do not superconduct at high temperatures, such as the strontium-ruthenate oxide compounds, but that, like the high-temperature superconductors, are unconventional in other ways (for example, the origin of the attractive force leading to the formation of Cooper pairs may be different from the one postulated in BCS theory).
	en.wikipedia.org /wiki/Unconventional_superconductors (320 words)

	Superconductivity (Site not responding. Last check: 2007-10-19)
		In conventional superconductors, superconductivity is caused by a force of attraction between certain conduction electronss arising from the exchange of phonons, which causes the conduction electrons to exhibit a superfluid phase composed of correlated pairs of electrons.
		Superconductors are also quite willing to maintain a current with no applied voltage whatsoever, a property exploited in the coils of MRI machines, among others.
		Many stories attribute additional properties to their hypothetical superconductors, ranging from infinite heat conductivity in Niven's novels (real superconductors conduct heat poorly, though liquid helium has immense heat conductivity) to teleportation in the Stargate movie and TV series.
	www.sciencedaily.com /encyclopedia/superconductivity (2301 words)

	Superconductivity - Open Encyclopedia (Site not responding. Last check: 2007-10-19)
		When a superconductor is placed in a weak external magnetic field H, the field penetrates for only a short distance λ, called the penetration depth, after which it decays rapidly to zero.
		These problems may soon be alleviated with the development of high temperature superconductors suitable for use in industry, as these can be cooled using liquid nitrogen rather than liquid helium (which is more expensive and difficult to handle.) Promising future applications include high-performance transformers, power storage devices, electric power transmission, electric motors (e.g.
		Many stories attribute additional properties to their fictional superconductors, ranging from infinite heat conductivity in Niven's novels (real superconductors conduct heat poorly, though superfluid helium has immense but finite heat conductivity) to teleportation in the Stargate movie and TV series.
	open-encyclopedia.com /Superconductivity (2301 words)

	High-temperature superconductor - Wikipedia, the free encyclopedia
		The term high-temperature superconductor was initially employed to designate the new family of cuprate-perovskite ceramic materials discovered by J.G. Bednorz and K.A. Müller in 1986.
		These materials are characterized by presenting superconductivity at a higher temperature than conventional superconductors (which require temperatures a few degrees above absolute zero (−273.15 °C or −459.67 °F)), and by other unconventional features.
		So-called high-temperature superconductors are generally considered to be those that demonstrate superconductivity at or above the temperature of liquid nitrogen, or −196 °C (77 K).
	en.wikipedia.org /wiki/High-temperature_superconductor (181 words)

	Atypical Superconductors
		Organic superconductors are composed of an electron donor (the planar organic molecule) and an electron acceptor (a non-organic anion).
		Heavy fermions are compounds containing rare-earth elements such as Ce or Yb, or actinide elements such as U. Their (inner shell) conduction electrons often have effective masses (known as quasiparticle masses) several hundred times as great as that of "normal" electrons, resulting in what's known as low "Fermi energy" (Ef).
		However, a superconductor has been discovered that exhibits no measurable change in its specific heat (the amount of energy required to increase its temperature by one degree) while going through up to 3 different "critical" magnetic fields.
	superconductors.org /atypical.htm (1726 words)

	Inhaltsverzeichnisseite (Site not responding. Last check: 2007-10-19)
		Apart from the fact that the superconducting transition temperatures dramatically differ by orders of magnitude between these categories, probably the most significant distinction between conventional and unconventional superconductors is found in the symmetry of their order parameters.
		For anisotropic superconductors these experiments reveal exotic patterns, such as those shown in seen in the figures to the left, which serve as fingerprints for the underlying unconventional order parameter.
		Unconventional superconductivity continues to be a rich field, constantly revolutionized by the discovery of new materials, the refinement of modern experimental techniques, and the development of new theoretical ideas and methods.
	physics.usc.edu /CCM/uncsup.htm (825 words)

	Abstr
		For these superconductors, the splitting of the phase transition is found to be absent for arbitrary directions of the external field.
		For superconductors with anisotropic pairing a situation in which the critical fields of two irreducible representations have close values is characteristic.
		In this model, the UPt3 is a nearly isotropic d-wave superconductor whose transition temperature is split slightly by the crystal field.
	www.itp.ac.ru /~lukyanc/weblukyanc/publslctabs.html (2767 words)

	Unconventional wisdom (March 2005) - News - PhysicsWeb
		In conventional superconductors, electrons pair up as a result of their interactions with vibrations of the crystal lattice known as phonons.
		In contrast, it is thought that the electron pairs in unconventional superconductors are formed as a result of interactions with magnetic fluctuations in the material.
		In addition to allowing physicists to explore the phenomenon of unconventional superconductivity in more detail, the results also suggest that related classes of exotic superconductors may yet be discovered.
	physicsweb.org /articles/news/9/3/17/1 (460 words)

	[No title]
		In unconventional superconductors like those with a dwave symmetry, the order parameter is sensitive to scattering from non-magnetic impurities and surface roughness.
		We assume that the superconductors contain a small concentration of impurities, and we would like to study the influence of these impurities on the quasiparticle bound states formed at the junction [3,4].
		In unconventional superconductors, the order parameter is spatially inhomogeneous close to obstacles like surfaces or interfaces.
	www.ubka.uni-karlsruhe.de /vvv/1998/physik/6/6.text (2687 words)

	Physics Today January 2001
		The pairs in a superconductor are in a spatially uniform state with respect to their center-of-mass coordinate, and their possible internal motion will be classified by those symmetry operations centered on a Ru ion that leave the crystal invariant--that is, the "point group" of the crystal.
		In a singlet superconductor, the electrons in the Cooper pairs are bound in spin singlets; they are not polarized at all in the small fields applied in NMR experiments.
		But for triplet superconductors with the parallel spins lying in the plane, the application of a magnetic field in the plane changes the relative numbers of pairs with spin parallel and antiparallel to the field, and the Knight shift is unchanged from its value in the normal state.
	www.physicstoday.org /pt/vol-54/iss-1/p42.html (3587 words)

	Research (Site not responding. Last check: 2007-10-19)
		"Studies of unconventional superconductors with the scanning SQUID microscope", Dept. of Physics seminar, University of Texas, Austin, Sept.
		"Studies of unconventional superconductors using the scanning SQUID microscope", Seminar, University of Augsburg, Augsburg, Germany, June 2, 1998.
		"Studies of Unconventional Superconductors with the Scanning SQUID Microscope", I.N.F.N. Sezione di Genova, Genoa, Italy, September 26, 1996.
	www.research.ibm.com /people/k/jrk/talks.htm (2472 words)

	Superconductor Device Physics, Dale J. Van Harlingen
		At present, our main efforts are studies of the pairing symmetry of unconventional superconductors, and the development and application of scanning probe microscopies.
		Our work on unconventional superconductors is directed toward determination of the pairing symmetry in superconductors using a SQUID interferometry technique that we pioneered.
		In the scanning probe work, we are using cryogenic scanning tunneling microscopy (STM) to study superconductor interfaces, and scanning SQUID microscopy (SSM) to study vortex structure and dynamics in superconductor materials and microfabricated arrays of Josephson junctions.
	www.physics.uiuc.edu /groups/gsac/Abstracts.f96/harlingen.html (248 words)

	UWM News Release (Site not responding. Last check: 2007-10-19)
		A superconductor is a substance that, when properly chilled (and we're talking serious chilling here), conducts electricity with no resistance whatsoever.
		The unconventional superconductors can be cooled with liquid nitrogen, which is plentiful and inexpensive enough to serve as a mainstay of physics demonstrations all over the world (dip a rose, tennis ball, banana or other object into the nitrogen, remove it, strike something with it and watch it shatter).
		Agterberg studies these new ceramic superconductors as a theorist, rather than an experimentalist, though he's quick to point out that he doesn't theorize in a vacuum.
	www.uwm.edu /News/PR/02.12/superconduct.html (374 words)

	High-temperature and other unconventional superconductors
		In the weak-coupling case the calculations are based on the fluctuation-enhanced exchange (FLEX) approximation, whereas in the strong-coupling case the leading terms of a 1/N expansion (N is the number of internal degrees of freedom for the electrons consisting of a spin and an additionally introduced flavor index) are considered.
		Elementary excitations in superconductors are of central interest in order to learn more about the correlations and the mechanism for Cooper-pairing.
		In analogy to conventional superconductors in which the tunneling density of states was analyzed, we calculate the feedback effect of the superconducting gap function Δ(k,ω) on the spin susceptibility for high-Tc cuprates.
	www.fkf.mpg.de /metzner/research/hightc/hightc.html (1739 words)

	USC College : Kazumi Maki (Site not responding. Last check: 2007-10-19)
		Professor Maki's research is dedicated to the exploration of unconventional superconductors (or nodal superconductors), unconventional charge density wave (UCDW) and unconventional spin density wave (USCD).
		"Quasiparticle spectrum in vortex state in Unconventional Superconductors" at the workshop on vortex state and vortex liquid, Dec. 11-12, 2000, Komaba (Tokyo), Japan.
		"Introduction to Unconventional Superconductors," "Vortex state in Unconventional Superconductors" at the symposium on Modern Problems in Condensed Matter Physics, Oct. 15-23, 2000, Tbilissi, Georgia.
	www.usc.edu /assets/college/faculty/profiles/277.html (282 words)

	Unconventional Superfluidity
		He does; yet, in a superconductor they are able to flow without electrical resistance or dissipation.
		The basic idea of BCS theory is that the electrons in a metal interact with the ions in the metal, in such a way that pairs of electrons will be attracted to each other.
		It is a 2-D superfluid with an unconventional, p-wave symmetry.
	www.ccmr.cornell.edu /~jcdavis/thirdsound/3SUnconventional.html (1671 words)

	1997 CIAR summer school on superconductivity (Site not responding. Last check: 2007-10-19)
		The systematic existence of twin planes in the high temperature superconductor YBCO causes vortices to be involved in pinning, peak effects, guided motion, locking angles and fishtails leading also to additional contributions to the anomalous Hall effect and to peculiar current distributions.
		The question of anomalous transport due to a band of impurity states in unconventional superconductors is discussed.
		It is argued here that the situation in High-Tc superconductors is very different: the superconducting state is characterised by a high density of (spin) pairs but the phase stiffness, determined by the density and mobility of holes on the stripes, is very low.
	www.physique.usherbrooke.ca /cerpema/Ecole/1997/Ciar-2.htm (2810 words)

	INVITED LECTURES, COLLOQUIA, AND SEMINARS
		Superconductors'', University of Miami Workshop on High-Temperature Superconductivity: Physical Properties and Mechanisms, Coral Gables, FL ``Theory of Electronic Raman Scattering in Disordered Unconventional Superconductors'', Simon Fraser University, Burnaby, BC (1995).
		``Effect of Impurities on the Raman Spectra of Superconductors'', University of Illinois at Urbana-Champaign, Urbana, IL (1993).
		``Raman Scattering in Unconventional Superconductors'', Joseph Stefan Institute, University of Ljubljana, Ljubljana, Slovenia (1993).
	www.science.uwaterloo.ca /~tpd/cvweb/node8.html (888 words)

	USRA Wei (Site not responding. Last check: 2007-10-19)
		This project is aimed at studying unconventional superconductors with several nanoscale techniques, using both "tops-down" and "bottoms-up" approaches.
		These superconducting materials are unconventional in that their electrons order at very short length scales, in both charge and spin.
		The student will be assist in the operation and refinement of cryomagnetic, nanoprobe and nanofabrication equipment, to measure the nanoscale tunneling and transport characteristics of these materials.
	www.physics.utoronto.ca /~graduate/usra/2005/weiusra.html (80 words)

	Bibliography
		A.Larkin A. Varlamov, ``Флуктуационные явления в сверхпроводниках`` глава в книге ``Handbook on Superconductivity: Conventional and Unconventional Superconductors,`` edited by K.-H.Bennemann and J.B. Ketterson, Springer, 2002.
		He-B by rapid thermal quench'' in: Vortices in Unconventional Superconductors and Superfluids, N. Schopohl, R. Huebener, and G. Volovik, eds.
		N. Kopnin, ``Vortex Dynamics and the Problem of the Transverse Force in Clean Superconductors and Fermi Superfluids'' in: Vortices in Unconventional Superconductors and Superfluids, N. Schopohl, R. Huebener, and G. Volovik, eds.
	www.itp.ac.ru /eng/reports/2002/cmsc (440 words)

	Unconventional Superconductors Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-19)
		Looking For unconventional superconductors - Find unconventional superconductors and more at Lycos Search.
		Look for unconventional superconductors - Find unconventional superconductors at one of the best sites the Internet has to offer!
		Search for unconventional superconductors - Find results for unconventional superconductors and anything else you are looking for instantly!
	www.karr.net /search/encyclopedia/Unconventional_superconductors (495 words)

	LIST OF PUBLICATIONS
		Unconventional Electronic Raman Spectra of Borocarbide Superconductors, I.-S. Yang, M. Klein, T. Devereaux, I.
		Role of Symmetry in Raman Spectroscopy of Unconventional Superconductors, T. Devereaux, in Spectroscopic Studies of Superconductors I. Bozovic and D. van der Marel, Editors, Proc.
		Theory for the Effect of Impurities on the Raman Spectra of Superconductors.
	www.science.uwaterloo.ca /~tpd/cvweb/node11.html (828 words)

	Doppler Effect Reveals Gap Nodes, Physics Research Highlights, University of Illinois at Urbana-Champaign
		They believe this phenomenon should be common to many so-called unconventional superconductors, those whose Cooper pairs have symmetries more complex than originally envisaged in the classic BCS theory of superconductivity.
		In the vortex state of such superconductors, the zero-energy density of states of such nodal quasiparticles depends on the angle between the vortex line and the direction of the node.
		C, is a member of a fascinating class of superconductors that are believed to exhibit d-symmetry.
	www.physics.uiuc.edu /research/Highlights/Superconductor-gap-nodes.htm (331 words)

	Peter Hirschfeld c.v.
		``Infrared Conductivity of a d_x^2-y^2 Superconductor with Impurity and Spin-fluctuation Scattering", S.M. Quinlan, P.J. Hirschfeld, and D.J. Scalapino, Phys.
		``Inhomogeneous order-parameter supression in disordered d-wave superconductors", W.A. Atkinson, P.J. Hirschfeld and A.H. MacDonald, Phys.
		``Observability of Phase Fluctuations in Cuprate Superconductors", H.-J. Kwon, A. Dorsey and P.J. Hirschfeld, Phys.
	www.phys.ufl.edu /~pjh/cv/cv.html (2003 words)

	Unconventional superconductor : Unconventional superconductors (Site not responding. Last check: 2007-10-19)
		Unconventional superconductors are materials that display superconductivity but that do not conform toBCS theory or its extensions.
		All is still licensed under the GNU FDL.
		The macer made room for the son of the presiding coloured, misbegotten caitiff, Duncan Jopp, on trial for his life.
	www.termsdefined.net /un/unconventional-superconductors.html (453 words)

Try your search on: Qwika (all wikis)