The antiferromagnetic/paramagnetic transition in mixed-spin compounds R2BaNiO5

Details The antiferromagnetic/paramagnetic transition in mixed-spin compounds R2BaNiO5 The antiferromagnetic/paramagnetic transition in mixed-spin compounds R2BaNiO5

2005-07-15

arxiv.org/abs/cond-mat/0507372v1

Eur. Phys. J. B 44, 439 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 12 figures, published in EPJB

Scientific paper

10.1140/epjb/e2005-00143-2

We present an extensive Quantum Monte Carlo study of the magnetic properties of the mixed-spin quantum systems R2BaNiO5 (R= magnetic rare earth) which show coexistence of 3-dimensional magnetic long-range order with 1-dimensional quantum gap excitations. We discuss the validity of the performed simulations in the critical region and show the excellent agreement with experimental results. We emphasize the importance of quantum fluctuations contained in our study which is absent in previous mean-field-like treatments.

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