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Crystal structures and variable magnetism of PbCu2(XO3)2Cl2 with X = Se, Te

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons126671

Janson,  O.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126819

Rosner,  H.
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126888

Tsirlin,  A. A.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Berdonosov, P. S., Janson, O., Olenev, A. V., Krivovichev, S. V., Rosner, H., Dolgikh, V. A., et al. (2013). Crystal structures and variable magnetism of PbCu2(XO3)2Cl2 with X = Se, Te. Dalton Transactions, 42(26), 9547-9554. doi:10.1039/c3dt50426c.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0015-1FBF-E
Zusammenfassung
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.