Quasiparticle Mass Enhancement Close to the Quantum Critical Point in BaFe2(As1-xPx)2

被引：107

作者：

Walmsley, P. ^{[1
]}

Putzke, C. ^{[1
]}

Malone, L. ^{[1
]}

Guillamon, I. ^{[1
]}

Vignolles, D. ^{[2
]}

Proust, C. ^{[2
]}

Badoux, S. ^{[2
]}

Coldea, A. I. ^{[3
]}

Watson, M. D. ^{[3
]}

Kasahara, S. ^{[4
]}

Mizukami, Y. ^{[4
]}

Shibauchi, T. ^{[4
]}

Matsuda, Y. ^{[4
]}

Carrington, A. ^{[1
]}

机构：

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

[2] Lab Natl Champs Magnet Intenses CNRS INSA UJF UPS, F-31400 Toulouse, France

[3] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

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

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 25期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

20;

D O I：

10.1103/PhysRevLett.110.257002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a combined study of the specific heat and de Haas-van Alphen effect in the iron-pnictide superconductor BaFe2(As1-xPx)(2). Our data when combined with results for the magnetic penetration depth give compelling evidence for the existence of a quantum critical point close to x = 0.30 which affects the majority of the Fermi surface by enhancing the quasiparticle mass. The results show that the sharp peak in the inverse superfluid density seen in this system results from a strong increase in the quasiparticle mass at the quantum critical point.

引用

页数：5

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