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-1D antiferromagnet Cu(N2H5)2(SO4)2. On cooling and at zero magnetic field this compound enters a 1D regime with short-range magnetic correlations, marked b...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2016-12, Vol.28 (50), p.506004-506004
Main Authors: Paduan-Filho, A, Vieira, A P, Ramon, J G A, Freitas, R S
Format: Article
Language:English
Subjects:
antiferromagnetics
low-dimensional
magnetic phase boundaries
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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-1D antiferromagnet Cu(N2H5)2(SO4)2. On cooling and at zero magnetic field this compound enters a 1D regime with short-range magnetic correlations, marked by a broad maximum in the specific heat and magnetic susceptibility at Tmax∼2 K, followed by a tridimensional antiferromagnetically ordered phase below TN∼1 K induced by small interchain couplings. The intermediate-temperature 1D regime can be modeled using exact quantum-transfer-matrix calculations, which offer a compatible description of the nonmonotonic behavior of Tmax as a function of the magnetic field, giving J=4.25 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:0953-8984
1361-648X
DOI:10.1088/0953-8984/28/50/506004