Magnetic-field-induced superconductivity in layered organic molecular crystals with localized magnetic moments

Cepas, O., McKenzie, R. H. and Merino, J. (2002) Magnetic-field-induced superconductivity in layered organic molecular crystals with localized magnetic moments. International Journal of Modern Physics B, 16 20-22: 3071-3071. doi:10.1142/S0217979202013596


Author Cepas, O.
McKenzie, R. H.
Merino, J.
Title Magnetic-field-induced superconductivity in layered organic molecular crystals with localized magnetic moments
Journal name International Journal of Modern Physics B   Check publisher's open access policy
ISSN 0217-9792
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1142/S0217979202013596
Volume 16
Issue 20-22
Start page 3071
End page 3071
Total pages 1
Place of publication Singapore
Publisher World Scientific Publ Co Pte Ltd
Language eng
Subject C1
240204 Condensed Matter Physics - Other
240000 Physical Sciences
Abstract The synthetic organic compound λ(BETS)2FeCl4 undergoes successive transitions from an antiferromagnetic insulator to a metal and then to a superconductor as a magnetic field is increased. We use a Hubbard-Kondo model to clarify the role of the Fe3+ magnetic ions in these phase transition. In the high-field regime, the magnetic field acting on the electron spins is compensated by the exchange field He due to the magnetic ions. This suggests that the field-induced superconducting state is the same as the zero-field superconducting state which occurs under pressure or when the Fe3+ ions are replaced by non-magnetic Ga3+ ions. We show how Hc can be extracted from the observed splitting of the Shybnikov-de Haas frequencies. Furthermore, we use this method of extracting He to predict the field range for field-induced superconductivity in other materials. We also show that at high fields the spin fluctuations of the localized spins are not important.
Keyword Physics, Applied
Physics, Condensed Matter
Physics, Mathematical
Q-Index Code C1

 
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Created: Mon, 13 Aug 2007, 23:11:37 EST