First single-crystal synthesis and low-temperature structural determination of the quasi-2D quantum spin compound (CuCl)LaNb(2)O(7) - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Dalton Transactions Année : 2011

First single-crystal synthesis and low-temperature structural determination of the quasi-2D quantum spin compound (CuCl)LaNb(2)O(7)

Olivier J. Hernandez
  • Fonction : Auteur
Cédric Tassel
  • Fonction : Auteur
Kunihiro Nakano
  • Fonction : Auteur
Eric Collet
Atsushi Kitada
  • Fonction : Auteur
Kazuyoshi Yoshimura
  • Fonction : Auteur
Hiroshi Kageyama
  • Fonction : Auteur

Résumé

We provide a full description of the first single-crystal synthesis of the low-dimensional quantum spin compound (CuCl)LaNb(2)O(7) through the low-temperature topotactic ion exchange route. Very fast diffusion of ion-exchanged CuCl and Cs ions is observed. In addition, thorough structure determination at very low temperature is outlined following use of single-crystal X-ray diffraction and powder neutron diffraction, taking advantage of the better sensitivity of the latter method for describing O and Cl atoms. State-of-the-art calculations (Maximum Entropy Method) are used for visualising the fine structural features of this unusual pseudo-tetragonal superstructure. Our study unambiguously throws light on the long-standing controversy concerning the crystal structure of this compound, and allows for a relevant description of its magnetic properties. Incidentally, it is demonstrated that the low-temperature structural model tentatively proposed very recently by Tsirlin et al. (Phys. Rev. B, 2010, 82, 054107), according to powder synchrotron X-ray diffraction, is correct.

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Matériaux
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Dates et versions

hal-00658192 , version 1 (10-01-2012)

Identifiants

Citer

Olivier J. Hernandez, Cédric Tassel, Kunihiro Nakano, Werner Paulus, Clemens Ritter, et al.. First single-crystal synthesis and low-temperature structural determination of the quasi-2D quantum spin compound (CuCl)LaNb(2)O(7). Dalton Transactions, 2011, 40 (17), pp.4605. ⟨10.1039/c0dt01665a⟩. ⟨hal-00658192⟩
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