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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2013     Display Documents

ID: 668935.0, MPI für Chemische Physik fester Stoffe / publications 2013
Crystal structures and variable magnetism of PbCu2(XO3)2Cl2 with X = Se, Te
Authors:Berdonosov, P. S.; Janson, O.; Olenev, A. V.; Krivovichev, S. V.; Rosner, H.; Dolgikh, V. A.; Tsirlin, A. A.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Dalton Transactions
Issue / Number:26
Start Page:9547
End Page:9554
Review Status:not specified
Audience:Not Specified
Abstract / Description:Novel Cu2+-based compounds PbCu2(SeO3)(2)Cl-2 (space group C2/c; a = 13.056(1) angstrom; b = 9.5567(9) angstrom; c = 6.9006(6) angstrom; beta = 90.529(7)degrees; R-I = 0.0371) and PbCu2(TeO3)(2)Cl-2 (space group P21; a = 7.2401(2) angstrom; b = 7.2688(2) angstrom; c = 8.2846(2) angstrom; beta = 96.416(2)degrees; R-I = 0.0570) have been obtained by solid-state synthesis. Their crystal structures are remarkably dissimilar and underlie a very different magnetic behavior. While PbCu2(SeO3)(2)Cl-2 can be well described by a spin-chain model with an exchange coupling of J(1)similar or equal to 160 K, PbCu2(TeO3)(2)Cl-2 is a spin-dimer system that, however, features a comparable magnetic nearest-neighbor coupling of J. 213 K. PbCu2(SeO3)(2)Cl-2 orders antiferromagnetically below 12 K, whereas PbCu2(TeO3)(2)Cl-2 lacks long-range magnetic order down to at least 2 K, owing to the strong dimerization of the Cu2+ spins. Crystal structures of both compounds are rationalized in terms of relevant magnetic exchange pathways, and the implications for a broader range of Cu2+ compounds are discussed.
External Publication Status:published
Document Type:Article
Communicated by:Ina Werner
Affiliations:MPI für chemische Physik fester Stoffe
Identifiers:ISI:000320246200019 [ID No:1]
ISSN:1477-9226 [ID No:2]
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