Magnetic quantum oscillations in the charge-density-wave state of the organic metals α-(BEDT-TTF)2MHg(SCN)4 with M=K and Tl

被引：7
|
作者：
Kartsovnik, M. V. [1 ]
Zverev, V. N. [2 ,3 ]
Andres, D. [1 ]
Biberacher, W. [1 ]
Helm, T. [1 ]
Grigoriev, P. D. [4 ]
Ramazashvili, R. [5 ,6 ]
Kushch, N. D. [7 ]
Mueller, H. [8 ]
机构：
[1] Bayer Akad Wissensch, Walther Meissner Inst, D-85748 Garching, Germany
[2] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
[3] Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Moscow Reg, Russia
[4] Russian Acad Sci, LD Landau Inst Theoret Phys, Chernogolovka 142432, Russia
[5] CNRS, Lab Phys Theor IRSAMC, F-31062 Toulouse, France
[6] Univ Toulouse UPS, F-31062 Toulouse, France
[7] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Russia
[8] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France
来源：
LOW TEMPERATURE PHYSICS | 2014年 / 40卷 / 04期
基金：
俄罗斯基础研究基金会;
关键词：
PHASE-DIAGRAM; MAGNETORESISTANCE OSCILLATIONS; HIGH-FIELD; TRANSPORT-PROPERTIES; TEMPERATURE PHASE; SHUBNIKOV-DEHAAS; CONDUCTOR; MAGNETOTRANSPORT; ALPHA-(BEDT-TTF)(2)KHG(SCN)(4); TRANSITIONS;
D O I：
10.1063/1.4869592
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The low-temperature charge-density-wave (CDW) state in the layered organic metals alpha-(BEDT-TTF)(2)MHg(SCN)(4) has been studied by means of the Shubnikov-de Haas and de Haas-van Alphen effects. In addition to the dominant a-frequency, which is also observed in the normal state, both the magnetoresistance and magnetic torque possess a slowly oscillating component. These slow oscillations provide a firm evidence for the CDW-induced reconstruction of the original cylindrical Fermi surface. The alpha-oscillations of the interlayer magnetoresistance exhibit an anomalous phase inversion in the CDW state, whereas the de Haas-van Alphen signal maintains the normal phase. We argue that the anomaly may be attributed to the magnetic-breakdown origin of the alpha-oscillations in the CDW state. A theoretical model illustrating the possibility of a phase inversion in the oscillating interlayer conductivity in the presence of a spatially fluctuating magnetic breakdown gap is proposed. (C) 2014 AIP Publishing LLC.
引用
收藏
页码：377 / 383
页数：7
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