Charge density waves in layer structures: A NMR study on a 2HNbSe2 single crystal |
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Authors: | C Berthier D Jérome P Molinié J Rouxel |
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Institution: | Laboratoire de Chimie Minérale A, Université de Nantes, Nantes, France |
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Abstract: | We have studied by pulsed NMR a single crystal of 2HNbSe2 at ambient pressure and under hydrostatic pressure of 21 kbar in the temperature range 4.2–273 K. Our results are consistent with the onset of incommensurate charge density waves (ICDW) at TCDW = 33 K atP = 1 bar and 26 K at P = 21 kbar. Below TCDW, the lineshapes of the (m → m ? 1) transitions agree with a local distribution of Knight shift and electric field gradients respecting the symmetry of a triple ICDW, while above TCDW, pre-transitional broadening is observed. The product T1T = 500 ± 100 msk was found constant in the temperature range 4.2–77 K and pressure independant. |
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