Thermodynamics of spin 12 reduced s-d model with application to (LaCe)Al2 alloys
The Hamiltonian HK(B) of the spin 12 s-d exchange model in a uniform magnetic field B is reduced by a method previously applied to HK(0). The reduced s-d Hamiltonian Hr(B) is asymptotically equivalent in the thermodynamic limit to a mean-field hr(B), which exhibits a 2nd order phase transition at Tc if B is weak. hr(B) is applied to (LaCe)Al2 alloys. There is correspondence between theoretical and experimental curves of zero-field susceptibility χi(0, T): the theoretical χi(0, T) has a first-order pole at Tc, below the Kondo temperature TK; the experimental χie(0, T) curve has a finite maximum below TK. The zero-field theoretical specific heat of (LaCe)Al2 exhibits a finite discontinuity at Tc. Above Tc the expression for resistivity coincides with the one given by Kondo and the limiting T → 0 resistivity is finite.
Year of publication: |
1994
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Authors: | Maćkowiak, J. ; Wiśniewski, M. |
Published in: |
Physica A: Statistical Mechanics and its Applications. - Elsevier, ISSN 0378-4371. - Vol. 212.1994, 3, p. 382-397
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Publisher: |
Elsevier |
Saved in:
Online Resource
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