MAGNETIC PROPERTIES OF KMnF$sub 3$. II. WEAK FERROMAGNETISM

Journal Article · Fri Sep 01 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.123.1652· OSTI ID:4837234

Portis, A M

The static magnetic properties of single-crystal KMn/sub 3/ were studied by magnetic torsion measurements. These measurements are consistent with a transition to uniaxial antiferromagnetism below 88.3 deg K. Below 81.5 deg K the magnetic behavior is complex with the development of hysteresis and discontinuities in the torsion. Further, the torsion increases linearly with magnetic field in this range. These observations suggest the development of weak ferromagnetism in this crystal below 81.5 deg K. From a comparison of the direction of the weak moment and the known distertions in the crystal structure it is concluded that the weak moment results from a canting of the magnetic sublattices because of differences in the sublattice anisotropy. At 81.5 deg to 88.3 deg a moment appears only in strong magnetic fields. It is shown that the moment is developed in a field because of the increased parallel susceptibility of a canted antiferromagnet. The canting transition is interpreted as a first order transition of the Jahn-Teller type. The antiferromagnetic transition itself is associated with a change in lattice parameter and is interpreted as an exchange-controlled first-order transition. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-15-031402
• OSTI ID: 4837234
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 123; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

FERROMAGNETIC MATERIALS
HYSTERESIS
LATTICES
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETISM
MANGANESE FLUORIDES
MEASURED VALUES
MONOCRYSTALS
PHYSICS
POTASSIUM FLUORIDES
SUSCEPTIBILITY
TRANSIENTS