Small-angle neutron scattering of DyMo/sub 6/S/sub 8/ at low temperature
The Chevrel phase compound DyMo/sub 6/S/sub 8/ becomes superconducting at 2.05 K and is antiferromagnetic (AFM) T/sub M/ = 0.4 K. Experiments with an applied magnetic field have shown that the AFM state is gradually suppressed and a ferromagnetic component seems to be induced before H/sub c2/ (1200 0e) is reached. The present experiments have been performed at the small-angle scattering facility D11 at the Institut Laue Langevin with a dilution refrigerator and applied fields of up to 2000 0e. Neutron wavelengths of 6.25 and 10A have been used allowing a minimum wavevector Q/sub min/ approx. = 0.005 A/sup -1/ to be achieved. For increasing H we find a sudden increase in the small-angle scattering at H = 180 0e, which we identify as H/sub c1/. With a position sensitive detector we have also investigated the scattering as a function of the relative orientation of Q Vector and H Vector. For a simple paramagnet we would expect more magnetic intensity with Q Vector perpendicular H Vector than with Q Vector parallel H Vector, however, we find the exact reverse with somewhat more intensity for Q Vector parallel H Vector. This is not understood, but we propose that the small-angle scattering is predominantly inelastic. Similar anisotropic effects have been found in other Chevrel phase systems. 7 references.
- Research Organization:
- Institut Max von Laue - Paul Langevin, 38 - Grenoble (France); Geneva Univ. (Switzerland)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5531065
- Report Number(s):
- CONF-831187-16; ON: DE84003674
- Resource Relation:
- Conference: MMM conference, Pittsburgh, PA, USA, 8 Nov 1983
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DYSPROSIUM SULFIDES
CRITICAL FIELD
NEUTRON DIFFRACTION
MOLYBDENUM SULFIDES
FERROMAGNETISM
MAGNETIC FIELDS
SMALL ANGLE SCATTERING
SUPERCONDUCTIVITY
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
DYSPROSIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MAGNETISM
MOLYBDENUM COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties
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