Abstract
Zero-field susceptibility and specific heat of Pb[Cu(SO4)(OH)2] (linarite) single crystal were measured. In order to verify that linarite is a quasi-one-dimensional system with competing nearest-neighbour and next-nearest-neighbour in-chain exchange interaction (J1 ≈ –30 K, J2 ≈ 15 K), theoretical results based on electronic structure calculations within the LDA and a phenomenological modelling using the finite-temperature transfer-matrix method are taken into account. The possibility of various ground states is discussed in terms of the screened onsite repulsion Us: commensurate Neel or spin-Peierls phases versus incommensurate spiral states with acute or obtuse pitch angles. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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