Magnetic-field-induced phase transitions in the quasi-one-dimensional organic conductor HMTSF-TCNQ

K. Murata, Y. Fukumoto, K. Yokogawa, R. Takaoka, W. Kang, J. S. Brooks, D. Graf, H. Yoshino, T. Sasaki, R. Kato

Research output: Contribution to journalArticlepeer-review

Abstract

Motivated by an interest to see if the field-induced (FI) phase in the charge-density wave (CDW) system is similar to the field-induced-SDW (FISDW) in (TMTSF)2X, (TMTSF: tetramethyltetraselenafulvalene), we ex-amined the magnetic-field-induced phases in a quasi-one-dimensional (Q1D) organic conductor HMTSF-TCNQ (hexamethylene-tetraselenafulvalene- tetracyanoquinodimethane) under a pressure of 1.1 GPa, where the CDW occurring at 30 K is suppressed. The work was carried out by measurements of angular-dependent magnetoresistance oscillations and exploratory work on the Hall effect. It turned out that the FI-phase, most like-ly a FICDW for B > 0.1 T, accompany a quantum Hall effect, and the FI-phase transitions are controlled by the field component along the least conducting axis. Above 10 T, the lowest Landau level of the small 2D Fermi pocket (due to incomplete nesting of Fermi surface) exceeds the Fermi level, reaching the quantum limit. Al-though there are many differences between the CDW (HMTSF-TCNQ) and SDW ((TMTSF) 2X) systems, a sim-ilar scenario for field-induced phases seems to hold.

Original languageEnglish
Pages (from-to)477-483
Number of pages7
JournalFizika Nizkikh Temperatur
Volume40
Issue number4
Publication statusPublished - 2014 Apr

Keywords

  • Charge-density wave
  • Fermi sur-face
  • Field-induced phase transitions
  • HMTSF-TCNQ
  • Magnetoresistance
  • Nesting

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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