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

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

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

Тема: Магнитоквантовые осцилляции

Інший ID: PACS 73.43.–f, 74.70.Kn, 71.45.Lr, 75.30.Fv

URI: http://dspace.nbuv.gov.ua/handle/123456789/119452

Посилання: 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 // Физика низких температур. — 2014. — Т. 40, № 4. — С. 477-483. — Бібліогр.: 25 назв. — англ.

Підтримка: We are grateful to Professor Denis Jérome for the useful discussion at the early stage of this work. This work was carried out at the National High Magnetic Field Laboratory at Tallahassee, USA, starting from the preliminary work performed at High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project No 09H0072, 10H0005, 11H0046). This work is partially supported by IMR Tohoku Univ. (Project No 12H0022 ), JSPS Inst. Prog. for Young Researcher Overseas Visits “Promoting International Young Researchers in Mathematics and Math. Sci. by OCAMI”, and Grant-in-Aid Sci. Res. on Innovative Areas #23110722 from M. Education, and NSF DMR#1005293(FSU). W/K was supported by a grant from the National Research Foundation of Korea (NRF), funded by the Korean Government (MSIP) (Nos. 2011-0030902, 2010-00453 and 2008-0061893). Work at the NHMFL is supported by the NSF DMR#0654118, and by the State of Florida. To achieve this experiment, the assistance of A. Kiswandhi, S. Benjamin, L. Winter of the Brooks group was indispensable. We appreciate Prof. H. Fujiwara of Osaka Prefecture University for the x-ray examination for selecting high quality crystals.

Дата: 2014

Завантажень: 874

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

Анотація:

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 examined 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 likely 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. Although there are many differences between the CDW (HMTSF–TCNQ) and SDW ((TMTSF)₂X) systems, a similar scenario for field-induced phases seems to hold.

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