s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa2Cu4O8

被引：53

作者：

Khasanov, R. ^{[1
]}

Shengelaya, A. ^{[2
]}

Karpinski, J. ^{[3
]}

Bussmann-Holder, A. ^{[4
]}

Keller, H. ^{[1
]}

Mueller, K. A. ^{[1
]}

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] Tbilisi State Univ, Inst Phys, GE-0128 Tbilisi, Georgia

[3] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[4] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2008年 / 21卷 / 02期

关键词：

D O I：

10.1007/s10948-007-0302-z

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

To clarify the order parameter symmetry of cuprates, the magnetic penetration depth lambda was measured along the crystallographic directions a, b, and c in single crystals of YBa2Cu4O8 via muon spin rotation. This method is direct, bulk sensitive, and unambiguous. The temperature dependences of lambda(-2)(a) and lambda(-2)(b) exhibit an inflection point at low temperatures as is typical for two-gap superconductivity (TGS) with s+d-wave character in the planes. Perpendicular to the planes a pure s-wave gap is observed thereby highlighting the important role of c-axis effects. We conclude that these are generic and universal features in the bulk of cuprates.

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页码：81 / 85

页数：5

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