Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 28, Issue 50, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/50/506004
Keywords
magnetic phase boundaries; antiferromagnetics; low-dimensional
Categories
Funding
- Brazilian agency CNPq [478031/2013-0, 302880/2013-5]
- Brazilian agency FAPESP [2015/16191-5]
- NAP-FCX
- CAPES
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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 T-max similar to 2 K, followed by a tridimensional antiferromagnetically ordered phase below T-N similar to 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 T-max 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.
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