Evidence of a Kondo Destroying Quantum Critical Point in YbRh2Si2

被引：17

作者：

Steglich, Frank ^{[1
]}

Pfau, Heike ^{[1
]}

Lausberg, Stefan ^{[1
]}

Hamann, Sandra ^{[1
]}

Sun, Peijie ^{[2
]}

Stockert, Ulrike ^{[1
]}

Brando, Manuel ^{[1
]}

Friedemann, Sven ^{[3
]}

Krellner, Cornelius ^{[4
]}

Geibel, Christoph ^{[1
]}

Wirth, Steffen ^{[1
]}

Kirchner, Stefan ^{[1
,5
]}

Abrahams, Elihu ^{[6
]}

Si, Qimiao ^{[7
]}

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[4] Goethe Univ Frankfurt, Inst Phys, Frankfurt, Germany

[5] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[6] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[7] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2014年 / 83卷 / 06期

关键词：

HEAVY; SUPERCONDUCTIVITY; PRESSURE; FLUCTUATIONS; TEMPERATURE; TRANSITIONS;

D O I：

10.7566/JPSJ.83.061001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The heavy-fermion metal YbRh2Si2 is a weak antiferromagnet below T-N = 0.07 K. Application of a low magnetic field B-c = 0.06 T (perpendicular to c) is sufficient to continuously suppress the antiferromagnetic (AF) order. Below T approximate to 10 K, the Sommerfeld coefficient of the electronic specific heat gamma(T) exhibits a logarithmic divergence. At T < 0.3 K, gamma(T) similar to T-epsilon (epsilon : 0.3-0.4), while the electrical resistivity rho(T) = rho(0) + aT (rho(0): residual resistivity). Upon extrapolating finite-T data of transport and thermodynamic quantities to T = 0, one observes (i) a vanishing of the "Fermi surface crossover" scale T* (B), (ii) an abrupt jump of the initial Hall coefficient R-H(B) and (iii) a violation of the Wiedemann Franz law at B = B-c, the field-induced quantum critical point (QCP). These observations are interpreted as evidence of a critical destruction of the heavy quasiparticles, i. e., propagating Kondo singlets, at the QCP of this material.

引用

页数：8

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