Suppression of time-reversal symmetry breaking superconductivity in Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12

被引：35
|
作者：
Shu, Lei [1 ,10 ]
Higemoto, W. [2 ]
Aoki, Y. [3 ]
Hillier, A. D. [4 ]
Ohishi, K. [2 ]
Ishida, K. [5 ]
Kadono, R. [6 ]
Koda, A. [6 ]
Bernal, O. O. [7 ]
MacLaughlin, D. E. [8 ]
Tunashima, Y. [3 ]
Yonezawa, Y. [3 ]
Sanada, S. [3 ]
Kikuchi, D. [3 ]
Sato, H. [3 ]
Sugawara, H. [9 ]
Ito, T. U. [2 ]
Maple, M. B. [10 ]
机构：
[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA
[2] Japan Atom Energy Agcy, Tokai, Ibaraki 3191195, Japan
[3] Tokyo Metropolitan Univ, Dept Phys, Tokyo 1920397, Japan
[4] STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[5] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan
[6] KEK, Meson Sci Lab, Tsukuba, Ibaraki 3050801, Japan
[7] Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA
[8] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA
[9] Univ Tokushima, Fac Integrated Arts & Sci, Tokushima 7708502, Japan
[10] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
来源：
PHYSICAL REVIEW B | 2011年 / 83卷 / 10期
基金：
美国国家科学基金会;
关键词：
CRYSTALLINE-ELECTRIC-FIELD; MUON SPIN RELAXATION; ZERO-FIELD; PROS4SB12; UPT3; PHASE;
D O I：
10.1103/PhysRevB.83.100504
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Zero-field muon spin relaxation experiments have been carried out in the Pr(Os1-xRux)(4)Sb-12 and Pr1-yLayOs4Sb12 alloy systems to investigate broken time-reversal symmetry (TRS) in the superconducting state, signaled by the onset of a spontaneous static local magnetic field B-s. In both alloy series B-s initially decreases linearly with solute concentration. Ru doping is considerably more efficient than La doping, with a similar to 50% faster initial decrease. The data suggest that broken TRS is suppressed for Ru concentration x greater than or similar to 0.6 but persists for essentially all La concentrations. Our data support a crystal-field excitonic Cooper pairing mechanism for TRS-breaking superconductivity.
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页数：4
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