The low-temperature phase of alpha-(BEDT-TTF)(2)KHg(SCN)(4) .2. Pressure dependence of the Shubnikov-deHaas oscillations

被引：25

作者：

House, AA

Lubczynski, W

Blundell, SJ

Singleton, J

Hayes, W

Kurmoo, M

Day, P

机构：

[1] POLISH ACAD SCI, PL-41800 ZABRZE, POLAND

[2] UCL ROYAL INST GREAT BRITAIN, LONDON W1X 4BS, ENGLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1996年 / 8卷 / 49期

关键词：

D O I：

10.1088/0953-8984/8/49/027

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The magnetoresistance of alpha-(BEDT-TTF)(2)MHg(SCN)(4) (where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene and M = NH4 or K) has been studied under pressures of up to 14.8 kbar and for temperatures down to 0.7 K. The similar to 671 T (alpha) and similar to 4270 T (beta) Shubnikov-de Haas oscillations observed in the ambient pressure magnetoresistance of alpha-(BEDT-TTF)(2)KHg(SCN)(4) persist to the highest pressure while the other quantum oscillatory frequencies are removed under pressure. A strong second-harmonic component of the alpha-frequency oscillations is observed on the raw data at 1 bar and is initially suppressed by pressure but returns above similar to 9 kbar. Furthermore, in the salt alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) a similar pronounced second harmonic of the quantum oscillations has been observed at the highest pressures. The origins of these features of the data are discussed in the context of current models of the Fermi surfaces of these materials.

引用

页码：10377 / 10392

页数：16

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