Measurement of the shear strength of a charge-density wave

Details Measurement of the shear strength of a charge-density wave Measurement of the shear strength of a charge-density wave

2003-12-10

arxiv.org/abs/cond-mat/0312265v2

Physical Review Letters 93, 066601 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.93.066601

We have explored the shear plasticity of charge density waves (CDWs) in niobium triselenide samples with cross-sections having a single micro-fabricated thickness step. Shear stresses along the step result from thickness-dependent CDW pinning. For small thickness differences the CDW depins elastically at the volume average depinning field. For large thickness differences the thicker, more weakly pinned side depins first via plastic shear. A simple model describes the qualitative features of our data, and yields a value for the CDW's shear strength of approximately 9.5*10^3 N/m^2 and a lower bound for the elastic shear modulus of 2.1*10^4 N/m^2. These values are orders of magnitude smaller than the CDW's longitudinal modulus but are much larger than corresponding values for flux-line lattices, and may explain the relative coherence of the CDW response.

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