X-ray Investigation of the Magneto-elastic Instability of alpha'-NaV2O5

Abstract

We present an X-ray diffuse scattering study of the pretransitional structural fluctuations of the magneto-elastic transition in alpha'-NaV2O5. This transition is characterized by the appearance below Tsp~35K of satellite reflections at the reduced wave vector (1/2,1/2,1/4). A large regime of structural fluctuations is measured up to 90 K. These fluctuations are three dimensional between Tsp and ~50K and quasi-one dimensional above ~60K. At 40 K the anisotropy ratio is found to be (xib :xia :xic)= (3.8 : 1.8 : 1), which reveals the importance of transverse interactions in the stabilization of the low temperature phase. We discuss our results within the framework of recent theories dealing with the simultaneous occurrence of a charge ordering, a spin gap and a lattice distortion in this intriguing compound.

Accepted in PRB Rapid.comm. Corrected typos, references added, figures improved

References in corpus (5)

• NaV_2O_5 as a quarter-filled ladder compound
• Charge ordering and spin- Peierls transition in alpha'-NaV2O5
• Interference of a first-order transition with the formation of a spin-Peierls state in alpha'-NaV2O5?
• Study of spin-Peierls transition in alpha'--NaV2O5 by infrared reflectivity
• NaV_2O_5 as an Anisotropic t-J Ladder at Quarter Filling

Cited by in corpus (17)

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• Charge Order Driven spin-Peierls Transition in NaV2O5
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• Zigzag Charge Ordering in alpha'-NaV2O5
• High frequency ESR investigation on dynamical charge disproportionation and spin gap excitation in NaV_2O_5
• Orthorhombic versus monoclinic symmetry of the charge-ordered state of NaV2O5
• Spin-Peierls transition in NaV2O5 in high magnetic fields
• A microscopic model for the structural transition and spin gap formation in alpha'-NaV2O5
• Ordering in Two-Dimensional Ising Models with Competing Interactions
• Simultaneous Charge Ordering and Spin Dimerization in Quasi-Two-Dimensional Quarter-Filled Ladders
• Charge kinks as Raman scatterers in quarter-filled ladders
• Electron spin resonance study of Na_{1-x}Li_xV_2O_5
• Spin and charge excitations in the anisotropic Hubbard ladder at quarter filling with charge-ordering instability
• Charge order induced by electron-lattice interaction in NaV2O5
• Exact diagonalisation study of charge order in the quarter-filled two-leg ladder system NaV2O5
• Using electronic structure changes to map the H-T phase diagram of alpha'-NaV2O5