A magnetic field induced phase transition, from metallic to a highly conducting state, in the antiferromagnetic insulator λ-(BETS)_2FeCl_4
Abstract
The λ-(BETS)_2FeCl4 compound presents a phase transition, from metallic to an insulating antiferromagnetic ground state at ~= 8 K, which is associated with the antiferromagnetic ordering of the Fe ions. For the application of a magnetic accurately positioned in-plane, a new ground state has been observed above 17 T which has been suggested to be field induced superconductivity[1]. This transition has also been characterized by magnetic torque measurements, which indicate a hysteretic signal. Here we present electrical transport measurements on different samples of the same material. Although some important differences appear, we find clear indications of a phase transition from a metallic to a highly conducting state when magnetic fields exceeding 20 tesla are applied along the conducting planes. We discuss the possible physical origins of this transition. Work supported by NSF-DMR-99-74714. [1] S. Shinagawa, S. Uji et al., Proc. Phys. Phenom. Adv. Fields, Tsukuba, Japan, March 2000, and to be published.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2001
- Bibcode:
- 2001APS..MARE27010B