Influence of interchain-coupling effects on the low-T properties of the one-dimensional S=12 Heisenberg antiferromagnet Yb4As3

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Abstract

We have investigated the difference in the low-T specific heat, C(T,B), of single- and multi-domain Yb4As3 crystals in magnetic fields B⩽4T. Upon increasing field, which was applied parallel to the trigonal axis, the C(T)/T values of the single-domain sample have been found to be less reduced than that of the multi-domain one. Furthermore, a minimum value of C(T)/T which is unaffected at B⩾1T is observed for the single-domain sample around 0.25K. This behavior cannot be explained by the S=12 Heisenberg antiferromagnet with the intrachain coupling determined by the inelastic neutron scattering. The interchain coupling appears to be responsible for the reported C(T)/T behavior below 1K.

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    Citation Excerpt :

    However, our theoretical data systematically overestimate the experimental results. This might be related to imperfections in the charge-ordering [51] resulting in finite chains or to interchain coupling effects [52]. There is also some uncertainty in the experimental subtraction of the lattice contribution.

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