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Title: Onset of surface superconductivity beyond the Saint-James–de Gennes limit

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1395389
Grant/Contract Number:
AC02-07CH11358
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 10; Related Information: CHORUS Timestamp: 2017-09-28 10:54:58; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Xie, Hong-Yi, Kogan, Vladimir G., Khodas, Maxim, and Levchenko, Alex. Onset of surface superconductivity beyond the Saint-James–de Gennes limit. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.104516.
Xie, Hong-Yi, Kogan, Vladimir G., Khodas, Maxim, & Levchenko, Alex. Onset of surface superconductivity beyond the Saint-James–de Gennes limit. United States. doi:10.1103/PhysRevB.96.104516.
Xie, Hong-Yi, Kogan, Vladimir G., Khodas, Maxim, and Levchenko, Alex. Thu . "Onset of surface superconductivity beyond the Saint-James–de Gennes limit". United States. doi:10.1103/PhysRevB.96.104516.
@article{osti_1395389,
title = {Onset of surface superconductivity beyond the Saint-James–de Gennes limit},
author = {Xie, Hong-Yi and Kogan, Vladimir G. and Khodas, Maxim and Levchenko, Alex},
abstractNote = {},
doi = {10.1103/PhysRevB.96.104516},
journal = {Physical Review B},
number = 10,
volume = 96,
place = {United States},
year = {Thu Sep 28 00:00:00 EDT 2017},
month = {Thu Sep 28 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 28, 2018
Publisher's Accepted Manuscript

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  • The onset of superconductivity in homogeneous ultrathin films is found to occur when their normal-state sheet resistance falls below a value close to h/4e/sup 2/, the quantum resistance for pairs. The data further suggest that in the T..-->..0 limit such films are either superconducting or insulating. The existence of a threshold in systems which are not granular implies that its explanation involves more general arguments than those which follow from the modeling of films by Josephson-coupled arrays.
  • The transition between insulating and superconducting behavior in the low-temperature limit has been explored with use of ultrathin Dy-Ba-Cu-O {ital c}-axis-oriented films prepared by molecular-beam epitaxy. The transition appears as a separatrix between sets of {ital R}({ital T}) curves that exhibit either insulating or superconducting behavior in the {ital T}{r arrow}0 limit. Superconductivity is found only when the normal-state sheet resistance is below a value close to {ital h}/4{ital e}{sup 2}, or 6450 {Omega}. Hall-effect data relate the depression of {ital T}{sub {ital c}} with increasing sheet resistance to a reduction in hole concentration.
  • The superconducting transition temperatures ({ital T}{sub {ital c}}) and N{acute e}el temperatures ({ital T}{sub {ital N}}) have been determined for thirty ({ital R}{sub 1{minus}{ital x}}{ital R}{prime}{sub {ital x}})Ni{sub 2}B{sub 2}C single crystals. For {ital T}{sub {ital c}}{approx_gt}{ital T}{sub {ital N}}, deviations from de Gennes scaling occur that are probably due to crystalline electric field effects. For {ital T}{sub {ital c}}{lt}{ital T}{sub {ital N}} there is a {ital complete} {ital breakdown} of de Gennes scaling. In (Dy{sub 1{minus}{ital x}}{ital R}{prime}{sub {ital x}})Ni{sub 2}B{sub 2}C, {ital R}{prime}=Lu suppresses {ital T}{sub {ital c}} an order of magnitude more rapidly than {ital R}{prime}=Ho. Thismore » breakdown is inferred to arise from pair breaking by collective magnetic excitations. {copyright} {ital 1996 The American Physical Society.}« less