Fermi surface studies in the magnetic-field-induced superconductor <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>λ</mi><mo>−</mo><mo>(</mo><mi mathvariant="normal">BETS</mi><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">FeCl</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span>

S. Uji; H. Shinagawa; C. Terakura; T. Terashima; T. Yakabe; Y. Terai; M. Tokumoto; A. Kobayashi; H. Tanaka; H. Kobayashi

doi:10.1103/PhysRevB.64.024531

Fermi surface studies in the magnetic-field-induced superconductor $λ - (BETS)_{2} {FeCl}_{4}$

S. Uji, H. Shinagawa, C. Terakura, T. Terashima, T. Yakabe, Y. Terai, M. Tokumoto, A. Kobayashi, H. Tanaka, and H. Kobayashi

Phys. Rev. B 64, 024531 – Published 22 June 2001

Abstract

Measurements of the Shubnikov–de Haas (SdH) and angular-dependent magnetoresistance oscillations were performed to study the Fermi surface for a magnetic-field-induced superconductor $λ - (BETS)_{2} {FeCl}_{4} .$ We found two SdH oscillations ascribed to the minimum and maximum cross-sectional areas of corrugated cylindrical Fermi surface, which are estimated to be $14 %$ and $17 %$ of the first Brillouin zone, respectively. The mass of the conduction electrons is $4.1 m_{0},$ suggesting the enhancement due to many-body effects. Assuming a parabolic energy band, we obtain a Fermi energy of $\sim 20 meV$ and an interlayer transfer integral of $\sim 1 meV .$