NMR investigation of Field Induced Spin Density Waves in (TMTSF)2ClO4
Abstract
We present a ^77Se NMR study of the Field Induced Spin Density Waves (FISDW) which appear in the quasi 1D organic conductors (TMTSF)_2ClO4 when a magnetic field is applied along c*. Detailed measurements of the evolution of the NMR lineshape with applied magnetic field from 14.5 to 28 T at temperatures of 3.9 and 2 K are reported. At 3.9 K the NMR lineshape is insensitive to the applied field variation and all measured spectra are rather similar. At 2 K we identify three phase transitions, characterized by abrupt lineshape changes, at: 18, 22.8, and 26.3 T. The absence of the spectral broadening and shift of the spectra at the phase transitions suggests that the amplitude of the modulation of the spin density remains unchanged in different FISDW phases. However, it is the spatial variation of the spin texture that varies between different phases as indicated by the abrupt lineshape changed at the transitions. Possible origins of these phase transitions will be discussed.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARV19002M