Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements

被引：171

作者：

Hashimoto, K. ^{[1
]}

Serafin, A. ^{[2
]}

Tonegawa, S. ^{[1
]}

Katsumata, R. ^{[1
]}

Okazaki, R. ^{[1
]}

Saito, T. ^{[3
]}

Fukazawa, H. ^{[3
,4
]}

Kohori, Y. ^{[3
,4
]}

Kihou, K. ^{[4
,5
]}

Lee, C. H. ^{[4
,5
]}

Iyo, A. ^{[4
,5
]}

Eisaki, H. ^{[4
,5
]}

Ikeda, H. ^{[1
]}

Matsuda, Y. ^{[1
]}

Carrington, A. ^{[2
]}

Shibauchi, T. ^{[1
]}

机构：

[1] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan

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

[3] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[4] JST, Transformat Res Project Iron Pnictides TRIP, Chiyoda Ku, Tokyo 1020075, Japan

[5] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

STATE;

D O I：

10.1103/PhysRevB.82.014526

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Among the iron-based pnictide superconductors the material KFe2As2 is unusual in that its Fermi surface does not consist of quasinested electron and hole pockets. Here we report measurements of the temperature dependent London penetration depth of very clean crystals of this compound with residual resistivity ratio >1200. We show that the superfluid density at low temperatures exhibits a strong linear-in-temperature dependence which implies that there are line nodes in the energy gap on the large zone-centered hole sheets. The results indicate that KFe2As2 is an unconventional superconductor with strong electron correlations.

引用

页数：6

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