| Numéro |
J. Phys. IV France
Volume 114, April 2004
|
|
|---|---|---|
| Page(s) | 343 - 345 | |
| DOI | https://doi.org/10.1051/jp4:2004114078 | |
J. Phys. IV France 114 (2004) 343
DOI: 10.1051/jp4:2004114078
Possible quantum hall effect in the two-dimensional organic
conductor,
-(EDO-S,
S-DMEDT-TTF)
2(AuBr
2)
1+y in the two-Fermi surface system
K. Murata1, T. Nakanishi1, H. Yoshino1, T. Konoike1, J. Brooks1, D. Graf2 and G.C. Papavassiliou3
1 Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
2 Dept. of Phys. Florida St. Univ./ Nat'l High Mag. Field Lab., Tallahassee, FL 32306-4005, USA
3 Theor. and Phys. Chem. Inst., National Hellenic Research Foundation, Athens, 116/8577, Greece
Abstract
In the two-dimensional organic conductor,
-(EDO-
S,
S-DMEDT-TTF)
2(AuBr
2)1+y, we have observed Shubnikov de
Hass oscillations with Landau level down to
n = 1 (quantum limit), and found
Hall resistance plateau above 35 Tesla.(
n = 1). This plateau might be
interpreted as a new quantum Hall effect (QHE), realized by two 2D Fermi
surfaces (FS). Since the areas and effective masses are, 0.66%(1.6
m0) and 6.1%(3.5-5.2
m0) of the first Brillouin zone, the large
FS can play the role of electron reservoir for the small FS. This explains
the plateau structure in Hall effect. To confirm that two series of
oscillations are associated with really thermodynamic phenomena, we
performed torque and Shubnikov de Haas studies.
Key words. Two-dimensional organic conductor, quantum Hall effect.
© EDP Sciences 2004