93Nb NMR spin echo spectroscopy in single crystal NbSe3.
We report electric field induced phase displacements of the charge density wave (CDW) in a single crystal of NbSe3 using 93Nb NMR spin-echo spectroscopy. CDW polarizations in the pinned state induced by unipolar and bipolar pulses are linear and reversible up to at least E = (0.96)ET. The polarizations have a broad distribution extending up to phase angles of order 60 degrees for electric fields close to threshold. No evidence for polarizations in excess of a CDW wavelength or for a divergence in polarization near ET are observed. The results are consistent with elastic depinning models, provided that the critical regime expected in large systems is not observable.
Department of Physics & Astronomy, UCLA, Los Angeles, California 90095-1547, USA.
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Suh
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Clark
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Monceau
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Thorne
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Brown