TY - JOUR
T1 - Thermodynamics and correlations of a helical spin chain with non-magnetic impurities
AU - Harada, I.
AU - Mikeska, H. J.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 1990
Y1 - 1990
N2 - The effect of non-magnetic impurities on the thermodynamics of a classical helimagnetic chain with antiferromagnetic nearest-neighbour interactions and next-nearest-neighbour interactions is studied by means of the transfer matrix method. The results for the partition function and the nearest-neighbour and the next-nearest-neighbour spin correlation functions are obtained exactly for both the isotropic Heisenberg model and the planar model as functions of temperature and concentration of non-magnetic impurities. The magnetic susceptibility is calculated up to terms linear in the concentration. It is found that a non-magnetic impurity modifies the helical spin structure in its vicinity and leads consequently to the formation of a new local equilibrium spin structure, which is called a spin complex. The consequences of this peculiar spin complex on the thermodynamics, especially on the spin correlation functions, are extensively discussed in connection with experimental results on FeMgBO 4.
AB - The effect of non-magnetic impurities on the thermodynamics of a classical helimagnetic chain with antiferromagnetic nearest-neighbour interactions and next-nearest-neighbour interactions is studied by means of the transfer matrix method. The results for the partition function and the nearest-neighbour and the next-nearest-neighbour spin correlation functions are obtained exactly for both the isotropic Heisenberg model and the planar model as functions of temperature and concentration of non-magnetic impurities. The magnetic susceptibility is calculated up to terms linear in the concentration. It is found that a non-magnetic impurity modifies the helical spin structure in its vicinity and leads consequently to the formation of a new local equilibrium spin structure, which is called a spin complex. The consequences of this peculiar spin complex on the thermodynamics, especially on the spin correlation functions, are extensively discussed in connection with experimental results on FeMgBO 4.
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U2 - 10.1088/0953-8984/2/4/015
DO - 10.1088/0953-8984/2/4/015
M3 - Article
AN - SCOPUS:36149029336
VL - 2
SP - 953
EP - 967
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 4
M1 - 015
ER -