Technical Report

A new inorganic spin-Peierls system NaV2O5

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Abstract

Since the discovery of high temperature superconductivity in doped antiferromagnetic cuprate materials, there has been a renewed interest in low-dimensional quantum antiferromagnets. A linear S = 1/2 chain with antiferromagnetic interaction along the chain interacting with the three-dimensional phonons can lead to a spin-Peierls (SP) phase transition. A dimerization of the spin chain below the transition temperature TSP leads to the formation of a non-magnetic singlet ground state. The transition is called a spin-Peierls transition because it is a magnetic analog of a Peierls transition in quasi-one-dimensional conductors. This transition was initially observed only in a few organic compounds. The discovery of an SP-state in the inorganic compound CuGeO3 has renewed strong interest in this phenomenon. Recently a new inorganic spin-Peierls system-NaV2O5 has been discovered with the highest critical temperature so far known TSP ~ 34 K. Fig. 47: Temperature variation of the (3/2, 1/2, 15/4) superlattice reflection of NaV2O5 measured by synchrotron x-ray diffraction. The inset shows the log-log plot of the reduced intensity vs. the reduced temperature t = (TSP T) / TSP. Here the results of x-ray diffraction investigations on a single crystal of a-NaV2O5 are reported. The diffraction experiment was performed with the helium cryostat mounted on the triple crystal diffractometer of the high energy beamline ID15A. An x-ray energy of 114.3 keV was used. Superlattice reflections corresponding to the cell doubling along a and b and quadrupling along c were detected below TSP ~ 34 K. Figure 47 shows the temperature variation of the integrated intensity of the (3/2, 1/2, 15/4) reflection which decreases continuously and becomes zero at

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