Magnetism of europium under extreme pressures

被引：21

作者：

Bi, W. ^{[1
,2
]}

Lim, J. ^{[3
,4
,5
]}

Fabbris, G. ^{[1
,3
,6
]}

Zhao, J. ^{[1
]}

Haskel, D. ^{[1
]}

Alp, E. E. ^{[1
]}

Hu, M. Y. ^{[1
]}

Chow, P. ^{[7
]}

Xiao, Y. ^{[7
]}

Xu, W. ^{[8
]}

Schilling, J. S. ^{[3
]}

机构：

[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[2] Univ Illinois, Dept Geol, Urbana, IL 61801 USA

[3] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[4] Washington State Univ, Inst Shock Phys, Pullman, WA 99164 USA

[5] Washington State Univ, Dept Chem, Pullman, WA 99164 USA

[6] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[7] Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA

[8] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 18期

基金：

美国国家科学基金会;

关键词：

ANTIFERROMAGNETIC TRANSITION; HYPERFINE INTERACTIONS; SYNCHROTRON-RADIATION; QUANTUM CRITICALITY; HEAVY FERMIONS; METAL YBRH2SI2; SUPERCONDUCTIVITY; MOSSBAUER; SCATTERING; VALENCE;

D O I：

10.1103/PhysRevB.93.184424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using synchrotron-based Mossbauer and x-ray emission spectroscopies, we explore the evolution of magnetism in elemental (divalent) europium as it gives way to superconductivity at extreme pressures. Magnetic order in Eu is observed to collapse just above 80 GPa as superconductivity emerges, even though Eu cations retain their strong local 4f(7) magnetic moments up to 119 GPa with no evidence for an increase in valence. We speculate that superconductivity in Eu may be unconventional and have its origin in magnetic fluctuations, as has been suggested for high-T-c cuprates, heavy fermions, and iron-pnictides.

引用

页数：6

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