Strong evidence of field-induced superconductivity and Shubnikov-de Haas oscillation in $\kappa $-(BETS)$_{2}$FeBr$_{4}$

T. Konoike; H. Fujiwara; B. Zhang; H. Kobayashi; M. Nishimura; S. Yasuzuka; K. Enomoto; S. Uji

doi:doi:10.1051/jp4:2004114048

Numéro		J. Phys. IV France Volume 114, April 2004


Page(s)		223 - 226
DOI		https://doi.org/10.1051/jp4:2004114048

J. Phys. IV France 114 (2004) 223
DOI: 10.1051/jp4:2004114048

Strong evidence of field-induced superconductivity and Shubnikov-de Haas oscillation in $\kappa$ -(BETS) ₂FeBr ₄

T. Konoike¹, H. Fujiwara², B. Zhang², H. Kobayashi^{2, 3}, M. Nishimura¹, S. Yasuzuka¹, K. Enomoto¹ and S. Uji¹

¹ National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
² Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
³ JST-CREST, Kawaguchi, Japan

Abstract
High field electronic state of the quasi-two dimensional organic superconductor, $\kappa$ -(BETS) ₂FeBr ₄was investigated. Under the magnetic field exactly parallel to the conducting layers, zero resistance was observed in the region of about $11 \sim 14$ T at 27 mK. This is the strong evidence of the field induced superconductivity in this salt. In the antiferromagnetic state below 5 T, Shubnikov-de Haas oscillation with a low frequency of 62 T was observed. This new frequency can be ascribed to a small pocket formed by the reconstruction of the Fermi surface due to the antiferromagnetic order. Key words. Organic conductors - Field induced superconductivity - Shubnikov-de Haas oscillation

Strong evidence of field-induced superconductivity and Shubnikov-de Haas oscillation in -(BETS) 2FeBr 4

Strong evidence of field-induced superconductivity and Shubnikov-de Haas oscillation in $\kappa$ -(BETS) ₂FeBr ₄