Phase diagram of magnetic-field-induced superconductor $\lambda $-(BETS)$_{2}$FeCl$_{4-x}$Br$_{x}$

S. Uji; S. Yasuzuka; H. Tanaka; M. Tokumoto; B. Zhang; H. Kobayashi; E.S. Choi; D. Graf; J.S. Brooks

doi:doi:10.1051/jp4:2004114093

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


Page(s)		391 - 392
DOI		https://doi.org/10.1051/jp4:2004114093

J. Phys. IV France 114 (2004) 391
DOI: 10.1051/jp4:2004114093

Phase diagram of magnetic-field-induced superconductor $\lambda$ -(BETS) ₂FeCl _4-xBr _x

S. Uji^{1, 1}, S. Yasuzuka¹, H. Tanaka^{2, 3}, M. Tokumoto^{2, 3}, B. Zhang⁴, H. Kobayashi^{4, 3}, E.S. Choi⁵, D. Graf⁵ and J.S. Brooks⁵

¹ National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
² Nanotechnology Research Institute, AIST, Tsukuba 305-8568, Japan
³ JST-CREST, Kawaguchi, Japan
⁴ Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
⁵ National High Magnetic Field Laboratory, FSU, Tallahassee, FL 32310, USA

Abstract
Resistance measurements of $\lambda$ -(BETS) ₂FeCl _4-xBr _x (x=0.7) have been performed to investigate the high magnetic field electronic state. When the magnetic field is applied exactly parallel to the c axis (in the conducting layers), superconducting phase is stabilized above 27 T for T < 2K after the antiferromagnetic insulating (AFI) phase is removed. The critical temperature T_c has a maximum at about 32 T, which is in good agreement with the case for x=0. However, the AFI phase is more stabilized for x=0.7 than for x=0. Key words. BETS system - superconductivity - $\pi d$ interaction.

Phase diagram of magnetic-field-induced superconductor -(BETS) 2FeCl 4-xBr x

Phase diagram of magnetic-field-induced superconductor $\lambda$ -(BETS) ₂FeCl _4-xBr _x