A low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V2O7

Abstract

We report the results of measurements of the dc-susceptibility and the 23Na-NMR response of Na2V2O7, a recently synthesized, non metallic low dimensional spin system. Our results indicate that upon reducing the temperature to below 100 K, the V^{4+} moments are gradually quenched, leaving only one moment out of 9 active. The NMR data reveal a phase transition at very low temperatures. With decreasing applied field H, the critical temperature shifts towards T = 0 K, suggesting that Na2V2O7 may be regarded as an insulator reaching a quantum critical point at H = 0.

4 pages, 5 figures

References in corpus (4)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Three-leg Antiferromagnetic Heisenberg Ladder with Frustrated Boundary Condition; Ground State Properties
• Frustrated 3-Dimensional Quantum Spin Liquid in CuHpCl
• Magnetic properties of the coupled ladder system MgV${}_2$O${}_5$

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