Phase diagram of the electron-doped La2-xCexCuO4 cuprate superconductor from andreev bound states at grain boundary junctions

被引：12

作者：

Wagenknecht, M. ^{[1
]}

Koelle, D.

Kleiner, R.

Graser, S.

Schopohl, N.

Chesca, B.

Tsukada, A.

Goennen, S. T. B.

Gross, R.

机构：

[1] Univ Tubingen, Phys Inst Experimentalphys 2, D-72076 Tubingen, Germany

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.100.227001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use quasiparticle tunneling across La(2-x)Ce(x)CuO(4) grain boundary junctions to probe the superconducting state and its disappearance with increasing temperature and magnetic field. A zero bias conductance peak due to zero energy surface Andreev bound states is a clear signature of the phase coherence of the superconducting state. Hence, such a peak must disappear at or below the upper critical field B(c2)(T). For La(2-x)Ce(x)CuO(4) this approach sets a lower bound for B(c2)(0)approximate to 25 T which is substantially higher than reported previously. The method of probing the superconducting state via Andreev bound states should also be applicable to other cuprate superconductors.

引用

页数：4

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