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IOP Publishing, Journal of Physics: Conference Series, (215), p. 012034, 2010

DOI: 10.1088/1742-6596/215/1/012034

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Pressure-Induced Superconductivity in Europium Metal

Journal article published in 2009 by M. Debessai, T. Matsuoka, J. J. Hamlin, W. Bi ORCID, Y. Meng, J. S. Schilling, K. Shimizu
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Divalent Eu (4f7, J=7/2) possesses a strong local magnetic moment which suppresses superconductivity. Under sufficient pressure it is anticipated that Eu will become trivalent (4f6, J=0) and a weak Van Vleck paramagnet, thus opening the door for a possible superconducting state, in analogy with Am metal (5f6, 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 Tc = 1.8 K; Tc increases linearly with pressure to 2.75 K at 142 GPa. Eu metal thus becomes the 53rd known elemental superconductor in the periodic table.