Evidence for a Nodal-Line Superconducting State in LaFePO

被引：191

作者：

Fletcher, J. D. ^{[1
]}

Serafin, A. ^{[1
]}

Malone, L. ^{[1
]}

Analytis, J. G. ^{[2
,3
]}

Chu, J. -H. ^{[2
,3
]}

Erickson, A. S. ^{[2
,3
]}

Fisher, I. R. ^{[2
,3
]}

Carrington, A. ^{[1
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[2] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[3] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 14期

基金：

英国工程与自然科学研究理事会;

关键词：

GAPS;

D O I：

10.1103/PhysRevLett.102.147001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In several iron-arsenide superconductors there is strong evidence for a fully gapped superconducting state consistent with either a conventional s-wave symmetry or an unusual s(+/-) state where the gap changes sign between the electron and hole Fermi-surface sheets. Here we report measurements of the penetration depth lambda(T) in very clean samples of the related iron-phosphide superconductor, LaFePO, at temperatures down to similar to 100 mK. We find that lambda(T) varies approximately linearly with T strongly suggesting the presence of gap nodes in this compound. Taken together with other data, this suggests the gap function is not universal for all pnictide superconductors.

引用

页数：4

共 36 条

[11] Penetration depth study of superconducting gap structure of 2H-NbSe2 [J].