Magnetic-Field-Induced Phase Transition and a Possible Quantum Hall Effect in the Quasi-One-Dimensional CDW Organic Conductor HMTSF-TCNQ

• 作者: David Graf Harukazu Yoshino Hikaru Hirayama James S. Brooks Keiichi Yokogawa Keizo Murata Reizo Kato Ryo Takaoka Ryota Tada Takahiko Sasaki Woun Kang Yuhei Fukumoto
• 来源期刊: 现代物理(英文)
• 学科: 物理学
• 关键词: Charge Density Wave MAGNETORESISTANCE Field-Induced CDW Fermi Surface NESTING Quantum Hall Effect
• 年，卷（期）: 2014,（8）
• 页码范围: 673-679
• 页数: 7页
• 分类号: O4

摘要

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 Rxy is almost constant and Rxx 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.