Renormalizations in unconventional superconducting states of Ce1-xYbxCoIn5

被引：6

作者：

Ding, Z. F. ^{[1
]}

Zhang, I. J. ^{[1
]}

Tan, I. C. ^{[1
]}

Huang, K. ^{[1
,8
]}

Chen, Q. Y. ^{[2
]}

Lum, I ^{[3
]}

Bernal, O. O. ^{[4
]}

Ho, P-C ^{[5
]}

MacLaughlin, D. E. ^{[6
]}

Maple, M. B. ^{[3
]}

Shu, L. ^{[1
,7
]}

机构：

[1] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[2] Sci & Technol Surface Phys & Chem Lab, Mianyang 621908, Peoples R China

[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[4] Calif State Univ, Dept Phys & Astron, Los Angeles, CA 90032 USA

[5] Calif State Univ, Dept Phys, Fresno, CA 93740 USA

[6] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[7] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[8] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW B | 2019年 / 99卷 / 03期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

MUON SPIN ROTATION; PENETRATION DEPTH; DENSITY; CECOIN5; TC;

D O I：

10.1103/PhysRevB.99.035136

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have measured the superconducting penetration depth Lambda(T) in the heavy-fermion/intermediate-valent superconducting alloy series Ce1-xYbxCoIn5 using a transverse-field muon spin relaxation to study the effect of intermediate-valent Yb doping on Fermi-liquid renormalization. From Lambda(T) we determine the superfluid density rho(s)(T) and find that it decreases continuously with increasing nominal Yb concentration x, i.e., with increasing intermediate valence. The temperature-dependent renormalization of the "normal" fluid density rho(N)(T)= rho(s)(0) - rho(s)(T) in both the heavy-fermion and intermediate valence limits is proportional to the temperature-dependent renormalization of the specific heat. This indicates that the temperature-dependent Fermi-liquid Landau parameters of the superconducting quasiparticles entering the two different physical quantities are the same. These results represent an important advance in understanding of both intermediate valence and heavy-fermion phenomena in superconductors.

引用

页数：6

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