Evidence of a d - to s-wave pairing symmetry transition in the electron-doped cuprate superconductor Pr2-xCexCuO4 -: art. no. 207004

被引：164

作者：

Biswas, A ^{[1
]}

Fournier, P

Qazilbash, MM

Smolyaninova, VN

Balci, H

Greene, RL

机构：

[1] Univ Maryland, Dept Phys, Ctr Superconduct Res, College Pk, MD 20742 USA

[2] Univ Sherbrooke, Dept Phys, Ctr Rech Proprietes Elect Mat Avances, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.88.207004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present point contact spectroscopy (PCS) data for junctions between a normal metal and the electron-doped cuprate superconductor Pr2-xCe xCuO4 (PCCO). For the underdoped compositions of this cuprate (xsimilar to0.13 ) we observe a peak in the conductance-voltage characteristics of the point contact junctions. The shape and magnitude of this peak suggest the presence of Andreev bound states at the surface of underdoped PCCO which is evidence for a d -wave pairing symmetry. For overdoped PCCO (xsimilar to0.17 ) the PCS data do not show any evidence of Andreev bound states at the surface suggesting an s -wave pairing symmetry.

引用

页数：4

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