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

[1]

ANALYTIS JG, ARXIV08105368

[2]

[Anonymous], ARXIV08073149

[3] Absence of nonlinear Meissner effect in YBa2Cu3O6.95 [J].

Carrington, A ;

Giannetta, RW ;

Kim, JT ;

Giapintzakis, J .

PHYSICAL REVIEW B, 1999, 59 (22) :14173-14176

[4] A BCS-like gap in the superconductor SmFeAsO0.85F0.15 [J].

Chen, T. Y. ;

Tesanovic, Z. ;

Liu, R. H. ;

Chen, X. H. ;

Chien, C. L. .

NATURE, 2008, 453 (7199) :1224-1227

[5] Magnetism, superconductivity, and pairing symmetry in iron-based superconductors [J].

Chubukov, A. V. ;

Efremov, D. V. ;

Eremin, I. .

PHYSICAL REVIEW B, 2008, 78 (13)

[6] Fermi Surface of Superconducting LaFePO Determined from Quantum Oscillations [J].

Coldea, A. I. ;

Fletcher, J. D. ;

Carrington, A. ;

Analytis, J. G. ;

Bangura, A. F. ;

Chu, J. -H. ;

Erickson, A. S. ;

Fisher, I. R. ;

Hussey, N. E. ;

McDonald, R. D. .

PHYSICAL REVIEW LETTERS, 2008, 101 (21)

[7]

DAGHERO D, ARXIV08121141

[8] Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2 [J].

Ding, H. ;

Richard, P. ;

Nakayama, K. ;

Sugawara, K. ;

Arakane, T. ;

Sekiba, Y. ;

Takayama, A. ;

Souma, S. ;

Sato, T. ;

Takahashi, T. ;

Wang, Z. ;

Dai, X. ;

Fang, Z. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. .

EPL, 2008, 83 (04)

[9]

*EPAPS, EPRLTAO102021916 EPA

[10] Momentum dependence of the superconducting gap in Ba1-xKxFe2As2 [J].

Evtushinsky, D. V. ;

Inosov, D. S. ;

Zabolotnyy, V. B. ;

Koitzsch, A. ;

Knupfer, M. ;

Buechner, B. ;

Viazovska, M. S. ;

Sun, G. L. ;

Hinkov, V. ;

Boris, A. V. ;

Lin, C. T. ;

Keimer, B. ;

Varykhalov, A. ;

Kordyuk, A. A. ;

Borisenko, S. V. .

PHYSICAL REVIEW B, 2009, 79 (05)

← 1 2 3 4 →