RETRACTED: Pressure-Induced Superconducting State of Europium Metal at Low Temperatures (Retracted Article)

被引：58
作者：
Debessai, M. [1 ]
Matsuoka, T. [1 ]
Hamlin, J. J. [1 ]
Schilling, J. S. [1 ]
Shimizu, K. [2 ]
机构：
[1] Washington Univ, Dept Phys, St Louis, MO 63130 USA
[2] Osaka Univ, KYOKUGEN, Ctr Quantum Sci & Technol Extreme Condit, Osaka 5608531, Japan
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 19期
基金：
美国国家科学基金会;
关键词：
STRUCTURAL-PROPERTIES; INTERMEDIATE VALENCE; EU;
D O I：
10.1103/PhysRevLett.102.197002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Divalent Eu (4f(7), J=7/2) possesses a strong local magnetic moment which suppresses superconductivity. Under sufficient pressure it is anticipated that Eu will become trivalent (4f(6), J=0) and a weak Van Vleck paramagnet, thus opening the door for a possible superconducting state, in analogy with Am metal (5f(6), J=0) which superconducts at 0.79 K. We present ac susceptibility and electrical resistivity measurements on Eu metal for temperatures 1.5-297 K to pressures as high as 142 GPa. At approximately 80 GPa Eu becomes superconducting at T-c similar or equal to 1.8 K; T-c increases linearly with pressure to 2.75 K at 142 GPa. Eu metal thus becomes the 53rd known elemental superconductor in the periodic table.
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页数：4
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