Low-temperature structural transition in the quasi-one-dimensional spin- 1 2 compound L i<sub>2</sub> C u<sub>2</sub> O( SO <sub>4</sub> )<sub>2</sub> - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2017

Low-temperature structural transition in the quasi-one-dimensional spin- 1 2 compound L i2 C u2 O( SO 4 )2

Résumé

A thorough structural exploration has been made on the quasi-one-dimensional S = 1/2 compound Li 2 Cu 2 O(SO 4) 2 by neutron and synchrotron x-ray diffraction. It reveals the occurrence of a structural transition at 125 K, characterized by a lowering of symmetry from P 4 2 /m to P ¯ 1, which is possibly driven by an exchange striction mechanism. This transition involves a dimerization of some Cu in the edge-sharing tetrahedral Cu chains. A symmetry mode analysis indicates that one representation, 3 + 4 + , dominates the structural transition. Interestingly, no intermediate structure with P 112/m symmetry is observed experimentally. Lastly, temperature dependent magnetic susceptibility measurements and neutron diffraction reveal that the magnetic ground state of this compound is a spin-singlet with a spin gap, characterized by the absence of long-range magnetic order down to 1.7 K.
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Dates et versions

hal-01526051 , version 1 (22-05-2017)

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Gwenaelle Rousse, J. Rodríguez-Carvajal, C. Giacobbe, M. Sun, O. Vaccarelli, et al.. Low-temperature structural transition in the quasi-one-dimensional spin- 1 2 compound L i2 C u2 O( SO 4 )2 . Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 95 (14), pp.144103 ⟨10.1103/PhysRevB.95.144103⟩. ⟨hal-01526051⟩
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