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- W2012121178 abstract "Chains of quantum spins with open ends and isotropic Heisenberg exchange are studied. By diagonalizing the Hamiltonian for chains of finite length N and obtaining all the energy eigenvalues, the magnetic susceptibility X, the specific heat C v , and the partition function Z can be calculated exactly for these chains. The high-temperature series expansions of these are then evaluated. For X and C v it is found that the terms in the series consist of three parts. One is the normal high-T series already known in great detail for the N → ∞ ring (chain with periodic boundary conditions). The other two consist of a 'surface' term and a correction term of order (/T) N . The surface term is found as a series up to and including (1/T) 8 for spin S = 1/2 and 1. Simple Pade approximant formulae are given to extend the range of validity below T = 1." @default.
- W2012121178 created "2016-06-24" @default.
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- W2012121178 date "2004-10-23" @default.
- W2012121178 modified "2023-09-25" @default.
- W2012121178 title "Surface effects in quantum spin chains" @default.
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- W2012121178 doi "https://doi.org/10.1088/0953-8984/16/44/020" @default.
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