Effective thickness of two-dimensional superconductivity in a tunable triangular quantum well of SrTiO3

被引：43

作者：

Ueno, K. ^{[1
,2
]}

Nojima, T. ^{[3
]}

Yonezawa, S. ^{[4
]}

Kawasaki, M. ^{[5
,6
,7
]}

Iwasa, Y. ^{[5
,6
,7
]}

Maeno, Y. ^{[4
]}

机构：

[1] Univ Tokyo, Dept Basic Sci, Tokyo 1538902, Japan

[2] Japan Sci & Technol Agcy, PRESTO, Tokyo 1020076, Japan

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[4] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[5] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan

[6] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[7] RIKEN, CEMS, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 02期

基金：

日本科学技术振兴机构;

关键词：

FIELD; TRANSITION; STATE;

D O I：

10.1103/PhysRevB.89.020508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report two-dimensionality and effective thickness of the superconductivity of a SrTiO3 single-crystal surface induced by electric double-layer gating. The carrier density was tuned from 3 x 10(13) to 1.1 x 10(14) cm(-2) by gating, where superconductivity appears with T-c of around 0.4 K. Typical two-dimensional behavior perfectly described by the Ginzburg-Landau equation was observed in the angular and temperature dependence of the upper critical magnetic field. The effective thickness of the superconducting layer remains nearly invariant, ranging from 11 to 13 nm, with increasing charge carrier density. This invariance contradicts the expected reduction in the thickness of the accumulation layer in a triangular quantum well model. This unexpected invariance of the superconducting layer thickness is probably a unique nature for a two-dimensional electron system in the incipient ferroelectric SrTiO3.

引用

页数：5

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