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Magnetoquantum oscillations, magnetic breakdown, and Fermi-surface modifications in NbSe/sub 3/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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The magnetoquantum oscillations in NbSe/sub 3/ show frequency shifts and beat structures due to interaction between the pinned charge-density-wave (CDW) configuration and the normal Fermi surface (FS). Spatial variations in the phase deformation of the CDW pinned at impurities can result in changes in the local Fermi level and CDW gap, giving rise to a distribution of extremal FS areas. Magnetic breakdown (MB) between these small FS sections and the open nested sheets of FS can have striking effects on the amplitude and frequency of the quantum oscillations due to modulation of the transmission and reflection coefficients at the MB junctions. A model using a one-dimensional open-orbit network and a rectangular distribution of FS areas has been used to fit the data in the range 0--225 kG. Good fits to the beat periods and frequency shifts are obtained and provide an accurate measure of the width of the frequency distribution for different CDW configurations. The existence of these MB mechanisms also provides an explanation for hysteresis and asymmetry observed in the magnetoresistance as the CDW configuration is manipulated in electric and magnetic fields.
Research Organization:
Department of Physics, University of Virginia, Charlottesville, Virginia 22901
OSTI ID:
5680351
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:13; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHALCOGENIDES
CRYSTALS
DATA ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRICAL PROPERTIES
ENERGY LEVELS
FERMI LEVEL
MAGNETIC FIELDS
MAGNETORESISTANCE
NIOBIUM COMPOUNDS
NIOBIUM SELENIDES
OSCILLATIONS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SELENIDES
SELENIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WAVE PACKETS