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The Néel Temperatures and Stability of Magnetic Phases in the Disturbed Body‐Centered Tetragonal Lattice. Uranium Compounds
Author(s) -
Przystawa J.
Publication year - 1967
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19670240131
Subject(s) - tetragonal crystal system , antiferromagnetism , lattice (music) , uranium , condensed matter physics , physics , chemistry , crystal structure , crystallography , nuclear physics , acoustics
The RPA Green's function method is used to treat the stability of various antiferromagnetic structures, as observed in a number of uranium compounds, on the basis of Heisenberg exchange interactions between first, second, and third‐neighbours. It is shown that these interactions cannot be neglected in a disturbed body centered tetragonal lattice. Expressions for the Néel temperatures are given and calculated explicitly. These results are compared with molecular field theory and it is shown that the latter correctly determines the range of exchange parameters which is admissible for the stable phase.