Superconductivity in CeCoIn5-xSnx:: Veil over an ordered state or novel quantum critical point? -: art. no. 047001

被引：68

作者：

Bauer, ED ^{[1
]}

Capan, C ^{[1
]}

Ronning, F ^{[1
]}

Movshovich, R ^{[1
]}

Thompson, JD ^{[1
]}

Sarrao, JL ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.94.047001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Measurements of specific heat and electrical resistivity in magnetic fields up to 9 T along [001] and temperatures down to 50 mK of Sn-substituted CeCoIn5 are reported. The maximal -ln(T) divergence of the specific heat at the upper critical field H-c2 down to the lowest temperature characteristic of non-Fermi-liquid systems at the quantum critical point (QCP), the universal scaling of the Sommerfeld coefficient, and agreement of the data with spin-fluctuation theory provide strong evidence for quantum criticality at H-c2 for all xless than or equal to0.12 in CeCoIn5-xSnx. These results indicate the "accidental" coincidence of the QCP located near H-c2 in pure CeCoIn5, in actuality, constitute a novel quantum critical point associated with unconventional superconductivity.

引用

页数：4

共 25 条

[1] OBSERVATION OF NON-FERMI-LIQUID BEHAVIOR IN U0.2Y0.8PD3 [J].