Why we still don`t know the symmetry of the order parameter in high temperature superconductors [electronic resource].

Published: Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description: 14 pages : digital, PDF file
Additional Creators: Argonne National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

One of the most elusive topics in the study of high temperature superconductors (HTCS) is the orbital symmetry of the superconducting order parameter Δ. The low temperature T behavior observed in many experiments suggests that Δ might exhibit line nodes, as expected for dₓ{sub −y}2 orbital symmetry. However, such behavior also arises from intrinsic proximity coupling and surface states, etc. The paramagnetic Meissner effect, once cited as indirect evidence for a d-wave Δ, was recently observed in Nb. Some phase-sensitive Josephson junction experiments gave strong evidence for a substantial isotropic, or s-wave, component to Δ, whereas others supported the above d-wave form. However, such experiments are intrinsically unreliable in experimental geometries with sample corners, or with meandering grain boundary junctions and stoichiometry inhomogeneities. Finally, the pseudogap observed recently in underdoped HTCS could arise from a charge-density wave.

Report Numbers

E 1.99:anl/msd/cp--92965
E 1.99: conf-961233--
conf-961233--
anl/msd/cp--92965

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Note

Published through SciTech Connect.
03/01/1997.
"anl/msd/cp--92965"
" conf-961233--"
"DE97008661"
International workshop on high-temperature superconductivity: ten years after its discovery, Jaipur (India), 16-21 Dec 1996.
Klemm, R.A.

Funding Information

W-31109-ENG-38

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