Low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V3O7 |
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Authors: | Gavilano J L Rau D Mushkolaj S Ott H R Millet P Mila F |
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Affiliation: | Laboratorium für Festk?rperphysik, ETH-H?nggerberg, CH-8093 Zürich, Switzerland. |
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Abstract: | We report the results of measurements of the dc susceptibility and the 23Na-NMR response of Na2V3O7, a recently synthesized, nonmetallic low dimensional spin system. Our results indicate that, upon reducing the temperature to below 100 K, the V4+ moments are gradually quenched, leaving only one moment out of nine 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 Na2V3O7 may be regarded as an insulator reaching a quantum critical point at H=0. |
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