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Properties of Randomly Diluted Heisenberg Antiferrornagnets with Spin 1/2
Author(s) -
Hattori K.
Publication year - 1976
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.2220740239
Subject(s) - spin (aerodynamics) , condensed matter physics , specific heat , heisenberg model , physics , critical point (mathematics) , order (exchange) , chemistry , ferromagnetism , thermodynamics , mathematics , mathematical analysis , finance , economics
The properties of Heisenberg antiferromagnets with spin ½ randomly diluted with non‐magnetic atoms are theoretically investigated. It is shown that the critical concentration of magnetic atoms p c for which the Néel point becomes 0 K is determined from the relation p c [1 − (1 − p c ) z ] = l/(z − 1), where z is the number of nearest neighbours. The variations of the Néel point, spin expectation value, and specific heat above the Néel point with concentration of magnetic atoms are also obtained. The Schottky‐type maximum of the specific heat due to the residual short range order above the Néel point is found near the critical concentration of magnetic atoms.