Why we still don`t know the symmetry of the order parameter in high temperature superconductors

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One of the most elusive topics in the study of high temperature superconductors (HTCS) is the orbital symmetry of the superconducting order parameter {Delta}. The low temperature T behavior observed in many experiments suggests that {Delta} might exhibit line nodes, as expected for d{sub x}{sub {minus}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 {Delta}, was recently observed in Nb. Some phase-sensitive Josephson junction experiments gave strong evidence for a substantial isotropic, or s-wave, component to {Delta}, whereas others supported the ... continued below

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14 p.

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Klemm, R.A. March 1, 1997.

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  • Klemm, R.A. Argonne National Lab., IL (United States). Materials Science Div.

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One of the most elusive topics in the study of high temperature superconductors (HTCS) is the orbital symmetry of the superconducting order parameter {Delta}. The low temperature T behavior observed in many experiments suggests that {Delta} might exhibit line nodes, as expected for d{sub x}{sub {minus}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 {Delta}, was recently observed in Nb. Some phase-sensitive Josephson junction experiments gave strong evidence for a substantial isotropic, or s-wave, component to {Delta}, 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.

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14 p.

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INIS; OSTI as DE97008661

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  • International workshop on high-temperature superconductivity: ten years after its discovery, Jaipur (India), 16-21 Dec 1996

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  • Other: DE97008661
  • Report No.: ANL/MSD/CP--92965
  • Report No.: CONF-961233--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 563262
  • Archival Resource Key: ark:/67531/metadc699358

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  • March 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 12:16 p.m.

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Klemm, R.A. Why we still don`t know the symmetry of the order parameter in high temperature superconductors, article, March 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc699358/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.