Model Evidence of a Superconducting State with a Full Energy Gap in Small Cuprate Islands

被引：21

作者：

Black-Schaffer, Annica M. ^{[1
]}

Golubev, Dmitri S. ^{[2
]}

Bauch, Thilo ^{[3
]}

Lombardi, Floriana ^{[3
]}

Fogelstrom, Mikael ^{[3
]}

机构：

[1] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[2] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany

[3] Chalmers, Dept Microtechnol & Nanosci, S-41296 Gothenburg, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 19期

基金：

瑞典研究理事会;

关键词：

T-C SUPERCONDUCTORS; TIME-REVERSAL; SYMMETRY; YBA2CU3O7-DELTA; SURFACES; TEMPERATURE; JUNCTIONS; BREAKING; DENSITY; FIELD;

D O I：

10.1103/PhysRevLett.110.197001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate subdominant order parameters stabilizing at low temperatures in nanoscale high-T-c cuprate islands, motivated by the recent observation of a fully gapped state in nanosized YBa2Cu3O7-delta [D. Gustafsson et al., Nature Nanotech. 8, 25 (2013)]. Using complementary quasiclassical and tight-binding Bogoliubov-de Gennes methods, we show on distinctly different properties dependent on the symmetry being d(x2-y2) + is or d(x2-y2) + id(xy). We find that a surface-induced d(x2-y2) + is phase creates a global spectroscopic gap which increases with an applied magnetic field, consistent with experimental observation.

引用

页数：5

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