Phase boundary in the dimensionality of angle-dependent magnetoresistance oscillations in the charge-transfer salt alpha-(BEDT-TTF)(2)KHg(SCN)(4)

被引:45
作者
House, AA
Blundell, J
Honold, MM
Singleton, J
Perenboom, JAAJ
Hayes, W
Kurmoo, M
Day, P
机构
[1] CATHOLIC UNIV NIJMEGEN, LAB HOGE MAGNEETVELDEN, NL-6525 ED NIJMEGEN, NETHERLANDS
[2] UCL ROYAL INST GREAT BRITAIN, LONDON W1X 4BS, ENGLAND
关键词
D O I
10.1088/0953-8984/8/45/017
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Angle-dependent magnetoresistance oscillations (AMROs) have been studied in the isostructural charge-transfer salts alpha-(BEDT-TTF)(2)KHg(SCN)(4) and alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) (where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene) in steady fields of up to 30 T. The shapes of the approximately elliptical quasi-two-dimensional (Q2D) Fermi surfaces that these organic metals possess have been determined at 30 T and are found to be in broad agreement with recent band-structure calculations. The Fermi surface of the salt alpha-(BEDT-TTF)(2)KHg(SCN)(4) undergoes a reconstruction at low fields and temperatures, resulting in a change in the dimensionality of the AMROs from Q2D character to quasi-one-dimensional character. This change is associated with the kink transition that is observed in magnetic field sweeps and is attributed to the formation of a spin-density wave ground state. The phase boundary of the change in the AMRO dimensionality has been followed to both the low-temperature high-field (about 23 T) and low-field high-temperature (about 8 K) extremes. The data are compared with recently proposed models of the AMROs and Fermi surfaces for these materials.
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页码:8829 / 8845
页数:17
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