Universal temperature dependence of the London penetration depth in κ−(ET)2X superconductors

dc.contributor.author Giannetta, R. W.
dc.contributor.author Olheiser, T. A.
dc.contributor.author Schlueter, J. A.
dc.contributor.author Tanatar, Makariy
dc.contributor.author Prozorov, Ruslan
dc.contributor.department Ames National Laboratory
dc.contributor.department Physics and Astronomy
dc.contributor.department Ames Laboratory
dc.date 2020-11-03T22:24:23.000
dc.date.accessioned 2021-02-24T20:27:03Z
dc.date.available 2021-02-24T20:27:03Z
dc.date.issued 2020-06-04
dc.description.abstract <p>High-precision radio-frequency magnetic susceptibility measurements were performed on single crystals of fully deuterated kappa-(ET)(2)Cu[N(CN)(2)]Br, hereafter designated as kappa-(D8 ET)(2)Cu[N(CN)(2)]Br. This material phase separates into superconducting and antiferromagnetic regions, the degree of which depends strongly upon the cooling rate. We show that the screening fraction rise varies logarithmically with the cooling rate over nearly five decades. The average size of superconducting regions is estimated to vary from 5 to 40 mu m, depending upon cooling rate, consistent with previous infrared microscopy measurements. In the region T less than or similar to T-c/3, the effective magnetic penetration depth exhibits power-law behavior lambda(T) - lambda(0) similar to T-n with n = 1.6, independent of the cooling rate. Changes in cooling rate and the consequent phase separation evidently do not introduce the kind of disorder that would alter the exponent n in a d-wave superconductor. The exponent remains close to n = 1.5, reported in single crystals of kappa-(ET)(2)Cu[N(CN)(2)]Br and kappa-(ET)(2)Cu(NCS)(2) [A. Carrington et al., Phys. Rev. Lett 83. 4172 (1999)]. The transition temperature fell linearly with 1 - eta(sc). Measurements were also made on kappa-(ET)(2)Cu[N(CN)(2)]Cl of normal isotopic abundance in which a very small amount of superconducting phase rise eta(sc) approximate to 10(-4) developed, presumably through the strain-induced sample mounting. This material showed a power-law exponent of n = 1.64, independent of the cooling rate.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/734/
dc.identifier.articleid 1730
dc.identifier.contextkey 20068961
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/734
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/93177
dc.language.iso en
dc.relation.ispartofseries IS-J 10247
dc.source.bitstream archive/lib.dr.iastate.edu/ameslab_manuscripts/734/IS_J_10247.pdf|||Sat Jan 15 01:46:35 UTC 2022
dc.source.uri 10.1103/PhysRevB.101.214503
dc.subject.disciplines Condensed Matter Physics
dc.title Universal temperature dependence of the London penetration depth in κ−(ET)2X superconductors
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
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