Author(s)

Keizo Murata, Yuhei Fukumoto, Keiichi Yokogawa, Woun Kang, Ryo Takaoka, Ryota Tada, Hikaru Hirayama, James S. Brooks, David Graf, Harukazu Yoshino, Takahiko Sasaki, Reizo Kato

Department of Physics, Ewha Womans University, Seoul, Korea.
Graduate School of Science, Osaka City University, Osaka, Japan.
Institute for Materials Research, Tohoku University, Sendai, Japan.
National High Magnetic Field Laboratory/Florida State University, Tallahassee, USA.
RIKEN, Wako, Saitama, Japan.

In the Temperature-Pressure phase diagram, the quasi-one-dimensional conductor, HMTSF-TCNQ, the ground state at ambient pressure is an insulator of charge density wave (CDW) below 30 K, while it shows a good metallic nature at higher temperature. The CDW insulating state is suppressed by a pressure of 1 GPa, which is considered to be a quantum critical point. Neither at 0 - 0.5 nor 2 GPa but only around this critical point in pressure, field-induced phases appear from 0.2 T through 10 T, where R_xy is almost constant and R_xx is very low. These phenomena are achieved when the magnetic field is applied along the least conducting axis. The behaviors are consistent with a kind of Quantum Hall Effect (QHE). The field-induce phase accompanied by the QHE might be the field-induced CDW (FICDW) similar to that of FISDW, observed in (TMTSF)₂X salts. This paper presents the latest result of the Hall effects reviewing the history of the authors’ work on this material from preliminary to the latest ones.

Charge Density Wave, Magnetoresistance, Field-Induced CDW, Fermi Surface, Nesting, Quantum Hall Effect

Murata, K. , Fukumoto, Y. , Yokogawa, K. , Kang, W. , Takaoka, R. , Tada, R. , Hirayama, H. , Brooks, J. , Graf, D. , Yoshino, H. , Sasaki, T. and Kato, R. (2014) Magnetic-Field-Induced Phase Transition and a Possible Quantum Hall Effect in the Quasi-One-Dimensional CDW Organic Conductor HMTSF-TCNQ. Journal of Modern Physics, 5, 673-679. doi: 10.4236/jmp.2014.58078.