Momentum dependence of the superconducting gap in NdFeAsO0.9F0.1 single crystals measured by angle resolved photoemission spectroscopy

被引：230

作者：

Kondo, Takeshi ^{[1
,2
]}

Santander-Syro, A. F. ^{[3
,4
]}

Copie, O. ^{[5
]}

Liu, Chang ^{[1
,2
]}

Tillman, M. E. ^{[1
,2
]}

Mun, E. D. ^{[1
,2
]}

Schmalian, J. ^{[1
,2
]}

Bud'ko, S. L. ^{[1
,2
]}

Tanatar, M. A. ^{[1
,2
]}

Canfield, P. C. ^{[1
,2
]}

Kaminski, A. ^{[1
,2
]}

机构：

[1] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] ESPCI, CNRS, UPR 5, Lab Photons & Mat, F-75231 Paris, France

[4] Ctr Univ Paris Sud, Phys Solides Lab, UMR 8502, CNRS, F-91405 Orsay, France

[5] CNRS Thales, Unite Mixte Phys, F-91767 Palaiseau, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 14期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.101.147003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use angle resolved photoemission spectroscopy to study the momentum dependence of the superconducting gap in NdFeAsO0.9F0.1 single crystals. We find that the Gamma hole pocket is fully gapped below the superconducting transition temperature. The value of the superconducting gap is 15 +/- 1: 5 meV and its anisotropy around the hole pocket is smaller than 20% of this value -consistent with an isotropic or anisotropic s-wave symmetry of the order parameter. This is a significant departure from the situation in the cuprates, pointing to the possibility that the superconductivity in the iron arsenic based system arises from a different mechanism.

引用

页数：4

共 41 条

[1]

Campuzano JC, 2004, PHYSICS OF SUPERCONDUCTORS, VOL II, P167

[2] Direct observation of particle-hole mixing in the superconducting state by angle-resolved photoemission [J].

Campuzano, JC ;

Ding, H ;

Norman, MR ;

Randeira, M ;

Bellman, AF ;

Mochiku, T ;

Kadowaki, K .

PHYSICAL REVIEW B, 1996, 53 (22) :14737-14740

[3] 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

[4] Even parity, orbital singlet, and spin triplet pairing for superconducting LaFeAsO1-xFx [J].

Dai, Xi ;

Fang, Zhong ;

Zhou, Yi ;

Zhang, Fu-Chun .

PHYSICAL REVIEW LETTERS, 2008, 101 (05)

[5] Angle-resolved photoemission studies of the cuprate superconductors [J].

Damascelli, A ;

Hussain, Z ;

Shen, ZX .

REVIEWS OF MODERN PHYSICS, 2003, 75 (02) :473-541

[6] Magnetic order close to superconductivity in the iron-based layered LaO1-xFxFeAs systems [J].

de la Cruz, Clarina ;

Huang, Q. ;

Lynn, J. W. ;

Li, Jiying ;

Ratcliff, W., II ;

Zarestky, J. L. ;

Mook, H. A. ;

Chen, G. F. ;

Luo, J. L. ;

Wang, N. L. ;

Dai, Pengcheng .

NATURE, 2008, 453 (7197) :899-902

[7] 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)

[8] Signature of superfluid density in the single-particle excitation spectrum of Bi2Sr2CaCu2O8+δ [J].

Feng, DL ;

Lu, DH ;

Shen, KM ;

Kim, C ;

Eisaki, H ;

Damascelli, A ;

Yoshizaki, R ;

Shimoyama, J ;

Kishio, K ;

Gu, GD ;

Oh, S ;

Andrus, A ;

O'Donnell, J ;

Eckstein, JN ;

Shen, ZX .

SCIENCE, 2000, 289 (5477) :277-281

[9] Fermi surface of Bi2Sr2CaCu2O8 [J].

Fretwell, HM ;

Kaminski, A ;

Mesot, J ;

Campuzano, JC ;

Norman, MR ;

Randeria, M ;

Sato, T ;

Gatt, R ;

Takahashi, T ;

Kadowaki, K .

PHYSICAL REVIEW LETTERS, 2000, 84 (19) :4449-4452

[10]

HASHIMOTO K, ARXIVCONDMAT08063149

← 1 2 3 4 5 →