Synchrotron x-ray spectroscopy studies of valence and magnetic state in europium metal to extreme pressures

被引：22

作者：

Bi, W. ^{[1
,2
,3
]}

Souza-Neto, N. M. ^{[2
,4
]}

Haskel, D. ^{[2
]}

Fabbris, G. ^{[2
]}

Alp, E. E. ^{[2
]}

Zhao, J. ^{[2
]}

Hennig, R. G. ^{[5
]}

Abd-Elmeguid, M. M. ^{[6
]}

Meng, Y. ^{[7
]}

McCallum, R. W. ^{[8
]}

Dennis, K. ^{[8
]}

Schilling, J. S. ^{[1
]}

机构：

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

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

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

[4] Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, Brazil

[5] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

[6] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[7] Carnegie Inst Sci, HPCAT, Argonne, IL 60439 USA

[8] Ames Lab, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 20期

基金：

美国国家科学基金会;

关键词：

INTERMEDIATE-VALENCE; EU; SCATTERING; MOSSBAUER; ABSORPTION; ELEMENTS;

D O I：

10.1103/PhysRevB.85.205134

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to probe the changes in the valence state and magnetic properties of Eu metal under extreme pressure, x-ray absorption near-edge spectroscopy, x-raymagnetic circular dichroism, and synchrotron Mossbauer spectroscopy experiments were carried out. The Mossbauer isomer shift exhibits anomalous pressure dependence, passing through a maximum near 20 GPa. Density functional theory has been applied to give insight into the pressure-induced changes in both Eu's electronic structure and Mossbauer isomer shift. Contrary to previous reports, Eu is found to remain nearly divalent to the highest pressures reached (87 GPa) with magnetic order persisting to at least 50 GPa. These results should lead to a better understanding of the nature of the superconducting state found above 75 GPa and of the sequence of structural phase transitions observed to 92 GPa.

引用

页数：12

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