Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe2

doi:10.1088/1674-1056/27/3/037501

中国物理B ›› 2018, Vol. 27 ›› Issue (3): 37501-037501.doi: 10.1088/1674-1056/27/3/037501

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂

Wen Zhang(张文), Yi Liu(刘毅), Xiaoying Wang(王小英), Yun Zhang(张云), Donghua Xie(谢东华)

Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, China

收稿日期:2017-10-26 修回日期:2017-12-04 出版日期:2018-03-05 发布日期:2018-03-05
通讯作者: Yi Liu E-mail:liuyifat@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11404297), the Science Challenge Project (Grant No. TZ2016004), and the Science and Technology Foundation of China Academy of Engineering Physics (Grant Nos. 2013B0301050 and 2014A0301013).

Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂

Wen Zhang(张文), Yi Liu(刘毅), Xiaoying Wang(王小英), Yun Zhang(张云), Donghua Xie(谢东华)

Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou 621908, China

Received:2017-10-26 Revised:2017-12-04 Online:2018-03-05 Published:2018-03-05
Contact: Yi Liu E-mail:liuyifat@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11404297), the Science Challenge Project (Grant No. TZ2016004), and the Science and Technology Foundation of China Academy of Engineering Physics (Grant Nos. 2013B0301050 and 2014A0301013).

摘要/Abstract

摘要： The heavy fermion physics arises from the complex interplay of nearly localized 4f/5f electrons and itinerant band-like ones, yielding heavy quasiparticles with an effective mass about 100 times (or more) of the bare electrons. Recently, experimental and theoretical investigations point out a localized and delocalized dual nature in actinide compounds, where itinerant quasiparticles account for the unconventional superconductivity in the vicinity of a magnetic instability. Here we report the strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂. The coupling is nearly antiferromagnetic. As embedded in the ferromagnetic matrix of localized 5f moments below T_C ≈ 52 K, this coupling leads to short-range dynamic correlations of heavy quasiparticles, characterized by fluctuations of magnetic clusters. Those cluster-like spins of itinerant quasiparticles show a broad hump of magnetization at T_X ≈ 28 K, which is typical for the spin-glass freezing. Thus, our results present the direct observation of itinerant quasiparticles coexisting with localized 5f moments by conventional magnetic measurements, providing a new route into the coexistence between ferromagnetism and superconductivity in heavy fermion systems.

关键词: UGe₂, ferromagnetic superconductor

Abstract: The heavy fermion physics arises from the complex interplay of nearly localized 4f/5f electrons and itinerant band-like ones, yielding heavy quasiparticles with an effective mass about 100 times (or more) of the bare electrons. Recently, experimental and theoretical investigations point out a localized and delocalized dual nature in actinide compounds, where itinerant quasiparticles account for the unconventional superconductivity in the vicinity of a magnetic instability. Here we report the strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂. The coupling is nearly antiferromagnetic. As embedded in the ferromagnetic matrix of localized 5f moments below T_C ≈ 52 K, this coupling leads to short-range dynamic correlations of heavy quasiparticles, characterized by fluctuations of magnetic clusters. Those cluster-like spins of itinerant quasiparticles show a broad hump of magnetization at T_X ≈ 28 K, which is typical for the spin-glass freezing. Thus, our results present the direct observation of itinerant quasiparticles coexisting with localized 5f moments by conventional magnetic measurements, providing a new route into the coexistence between ferromagnetism and superconductivity in heavy fermion systems.

Key words: UGe₂, ferromagnetic superconductor

中图分类号: (Spin-glass and other random models)

75.10.Nr

75.40.Gb (Dynamic properties?) 75.30.Mb (Valence fluctuation, Kondo lattice, and heavy-fermion phenomena)

张文, 刘毅, 王小英, 张云, 谢东华. Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂[J]. 中国物理B, 2018, 27(3): 37501-037501.

Wen Zhang(张文), Yi Liu(刘毅), Xiaoying Wang(王小英), Yun Zhang(张云), Donghua Xie(谢东华). Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂[J]. Chin. Phys. B, 2018, 27(3): 37501-037501.

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Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂

Strong coupling between localized 5f moments and itinerant quasiparticles in the ferromagnetic superconductor UGe₂

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