NDLI: Angle-dependent magnetoresistance oscillations and fermi surface recordering at high magnetic fields in /spl alpha/-(ET)/sub 2/KHg(SCN)/sub 4/

Content Provider	IEEE Xplore Digital Library
Author	Caulfield, J. Blundell, S.J. Singleton, J. House, A. Du Croo De Jongh, L. Hendriks, P.T.J. Perenboom, J.A.A.J. Hayes, W. Kurmoo, M. Day, P.
Copyright Year	1994
Description	Author affiliation: Clarendon Labs. (Caulfield, J.)
Abstract	Summary form only given. Angle dependent magnetoresistance oscillations (AMRO) have been studied in the charge transfer salt a-(ET)2KHg(SCN)4 for magnetic fields in the range 0 - 30 T. This salt exhibits the onset of antiferromagnetic order at temperatures TN -8-10 K and the presence below this temperature of a region of sharp negative magnetoresistance at a field around 22 T known as the kink. A MRO have been measured in this salt for a wide range of applied fields since the period, amplitude, and nature of the oscillations can be used to directly infer the character of the Fermi surf ice as a function of field. The data indicate that a profound change in the band structure occurs at this kink transition; the high field phase is characterised by quasi-2D oscillations from a closed cylindrical Fermi surface which is elongated in the c direction; the low field phase appears to be a spin density wave groundstate, with a Fermi surface consisting of a sheet (which is quasi-11) in character and tilted at an angle of 21' to the b*c plane) and small closed 2D pockets. It is suggested that the breakdown orbits between the pockets and the ID sheets are able to account for the various Shubnikov-de Haas frequencies observed below the kink.
Starting Page	178
Ending Page	178
File Size	104586
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.834972
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature dependence Temperature distribution Magnetic field measurement Surface waves Laboratories Antiferromagnetic materials Magnetic materials Magnetoresistance Magnetic fields Charge transfer
Content Type	Text
Resource Type	Article

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