Shubnikov-de Haas effect and Yamaji oscillations in the antiferromagnetically ordered organic superconductor k-(BETS)2FeBr4: A Fermiology study

L. Balicas; J. S. Brooks; K. Storr; D. Graf; S. Uji; H. Shinagawa; E. Ojima; H. Fujiwara; H. Kobayashi; A. Kobayashi; M. Tokumoto

doi:10.1016/S0038-1098(00)00374-4

paper

Shubnikov-de Haas effect and Yamaji oscillations in the antiferromagnetically ordered organic superconductor k-(BETS)2FeBr4: A Fermiology study

arXiv:cond-mat/0008287 · doi:10.1016/S0038-1098(00)00374-4

Abstract

Shubnikov-De Haas effect (SdH) effect and angular dependent magnetoresistance oscillations (AMRO) were observed in the organic superconductor: $I^º$ -(BETS) $_{2}$ FeBr $_{4}$ . In contrast to its isostructural compound $I^º - (B E T S)$ _2 $F e C l$ _4 $, S d H osc i l l a t i o n s, f or f i e l d s p er p e n d i c u l a r t o t h eco n d u c t in g pl an es, r e v e a l t h r ee F er mi S u r f a ce (F S) c l ose d or bi t s$ Î± $,$ Î² $, an d$ Î³ $w h osecr osssec t i o na l a r e a s a r e 19.8$ Î¼_Î± = (4.7 \pm 0.2) $m$ _e $,$ Î¼_Î² = (8.0 \pm 1.0) $m$ _e $, an d$ Î¼_Î³ = (2.0 \pm 0.2) $m$ _e $. T h eo b ser v a t i o n o f a$ Î³ $or bi t i s n o t e x p ec t e df r o mban d s t r u c t u r ec a l c u l a t i o n s,$ Î¼_Î² $i s am o n g t h e h e a v i es t ma ssese v er r e p or t e df or an or g ani cco n d u c t or . T h eo b ser v e d Y amaj i - l ik e A M R O in d i c a t es a 2 - D c l ose d F S, w a r p e d a l o n g t h e$ k_z$ direction.

6 pages, 6 figures