Magnetic structures in the superconductivity--weak-ferromagnetism coexistence phase
Magnetic superconductors whose symmetry admits of the existence of weak ferromagnetism in the normal state are considered. It is shown that the superconducting state below the T/sub N/ of such superconductors can exhibit either a phase with an inhomogeneous antiferromagnetic and a weak ferromagnetic moment of the domain structure type or a Meissner phase with a weak homogeneous ferromagnetic moment. The type of ordering is determined by the magnitude of the Dzyaloshinskii-Moriya interaction constant ..beta.., the homogeneous phase occurring at small values of ..beta... On cooling these phases may be replaced by a self-induced vortex structure. A phase diagram of the states in the (T,..beta..) plane is constructed. The possibility of explaining the modulation, revealed by neutron diffraction, of the antiferromagnetic moment in NdRh/sub 4/B/sub 4/ in the basis of the weak-ferromagnetism concept is discussed.
- Research Organization:
- Moscow State University
- OSTI ID:
- 6757268
- Journal Information:
- Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 58:2; ISSN SPHJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BORIDES
BORON COMPOUNDS
COHERENT SCATTERING
DIAGRAMS
DIFFRACTION
FERROMAGNETISM
MAGNETIC MOMENTS
MAGNETISM
NEODYMIUM BORIDES
NEODYMIUM COMPOUNDS
NEUTRON DIFFRACTION
PHASE DIAGRAMS
RARE EARTH COMPOUNDS
RHODIUM BORIDES
RHODIUM COMPOUNDS
SCATTERING
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS