Crossover from one- to three-dimensional behavior in the S = 1/2 Heisenberg antiferromagnet Cu(N2H5)2(SO4)2

From experimental and theoretical analyses of magnetic and specific-heat properties, we present the complete magnetic phase diagram of the quasi-one-dimensional antiferromagnet Cu(N\(_2\)H\(_5\))\(_2\)(SO\(_4\))\(_2\). On cooling and at zero magnetic field this compound enters a one-dimensional regi...

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Bibliographic Details
Published in:arXiv.org 2016-09
Main Authors: Paduan-Filho, A, Vieira, A P, Ramon, J G A, Freitas, R S
Format: Article
Language:English
Subjects:
Antiferromagnetism
Couplings
Crossovers
Heat exchange
Magnetic fields
Magnetic permeability
Magnetic properties
Magnetism
Phase diagrams
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Summary:From experimental and theoretical analyses of magnetic and specific-heat properties, we present the complete magnetic phase diagram of the quasi-one-dimensional antiferromagnet Cu(N\(_2\)H\(_5\))\(_2\)(SO\(_4\))\(_2\). On cooling and at zero magnetic field this compound enters a one-dimensional regime with short-range magnetic correlations, marked by a broad maximum in the specific heat and magnetic susceptibility at \(T_\mathrm{max}\sim 2\,\mathrm{K}\), followed by an ordered antiferromagnetic phase below \(T_\mathrm{N}\sim 1\,\mathrm{K}\) induced by small interchain couplings. The intermediate-temperate one-dimensional regime can be modeled using exact quantum-transfer-matrix calculations, which perfectly describe the nonmonotonic behavior of T_max as a function of the magnetic field, giving \(J = 4.25\,\mathrm{K}\) for the intrachain exchange parameter. The analysis of magnetic specific-heat and susceptibility data at low temperature indicates that the interchain exchange couplings are an order of magnitude smaller than the coupling inside the chains.
ISSN:2331-8422
DOI:10.48550/arxiv.1607.01846