Linear current-field relation of charge density waves near the depinning threshold in alkali-metal blue bronzes a0.3 moo3

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Abstract

The charge-density-wave current density-voltage (D - V)re lation is determined near the depinning threshold V, in the blue bronzes K,.3M003 and Rbo.3M003 by measuring the narrow-band voltage noise frequency of single CDW domains. A fit to the formula j,-,= = -CDW(V,/I)[(V-/V 11, 7)' yields a linear relation y = 1.0(+ 0.1) for fields V, c V CZ V, within the temperature range of 51 to 77 K. This finding is qualitatively different from theoretical results based on the mean-field approximation of the deformable medium model (y = 3/2) and also from the classical model of a finite domain in the potential of a single impurity (y = l/Z). The CDW conductivity, OCDW, near threshold is activated similarly to the findings of FLEMINeGt a l. (Phys. Rev. B, 33 (1986) 5450) at higher fields.

Original languageEnglish
Pages (from-to)1027-1033
Number of pages7
JournalEPL
Volume3
Issue number9
DOIs
Publication statusPublished - May 1 1987

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bronzes
alkali metals
thresholds
electric potential
narrowband
current density
impurities
conductivity
approximation
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Linear current-field relation of charge density waves near the depinning threshold in alkali-metal blue bronzes a0.3 moo3. / Jánossy, A.; Kriza, G.; Pekker, S.; Kamarás, K.

In: EPL, Vol. 3, No. 9, 01.05.1987, p. 1027-1033.

Research output: Contribution to journalArticle

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abstract = "The charge-density-wave current density-voltage (D - V)re lation is determined near the depinning threshold V, in the blue bronzes K,.3M003 and Rbo.3M003 by measuring the narrow-band voltage noise frequency of single CDW domains. A fit to the formula j,-,= = -CDW(V,/I)[(V-/V 11, 7)' yields a linear relation y = 1.0(+ 0.1) for fields V, c V CZ V, within the temperature range of 51 to 77 K. This finding is qualitatively different from theoretical results based on the mean-field approximation of the deformable medium model (y = 3/2) and also from the classical model of a finite domain in the potential of a single impurity (y = l/Z). The CDW conductivity, OCDW, near threshold is activated similarly to the findings of FLEMINeGt a l. (Phys. Rev. B, 33 (1986) 5450) at higher fields.",
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