Magnetic structure and critical properties of FeGe/sub 2/
A neutron study of the tetragonal antiferromagnet FeGe/sub 2/ has shown the existence of two continuous magnetic transitions at temperatures of approx.263 and approx.289 K. The upper temperature corresponds to a transition from paramagnetism to a basal-plane spiral structure propagating along the cell edges in that plane. At the lower temperature the spiral structure is transformed into the simple collinear structure previously reported in the literature. Typical critical behavior is observed at the upper temperature for individual satellite peaks. The spiral propagation vector decreases continuously to zero at the lower critical point, exhibiting power-law behavior with an exponent of 0.40/sub 7/ +- 0.005. Heat-capacity measurements reveal two lambda-type anomalies with critical exponents in the expected range. The phase diagram has been analyzed using mean-field and renormalization-group considerations. A model based on zero basal-plane spin anisotropy yields a magnetic structure which agrees with the observed structure of the intermediate phase. The effect of an external field has also been treated theoretically.
- Research Organization:
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 6036440
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 31:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IRON COMPOUNDS
MAGNETIC PROPERTIES
ANTIFERROMAGNETIC MATERIALS
GERMANIUM COMPOUNDS
MAGNETIC SPECIFIC HEAT
NEUTRON DIFFRACTION
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
TRANSITION TEMPERATURE
COHERENT SCATTERING
DIAGRAMS
DIFFRACTION
MAGNETIC MATERIALS
MATERIALS
PHYSICAL PROPERTIES
SCATTERING
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360104* - Metals & Alloys- Physical Properties