N Bhattacharya et al 2009 Supercond. Sci. Technol. 22 125013 doi:10.1088/0953-2048/22/12/125013
Investigation of carriers and ac transport processes in pure and praseodymium doped YBCO in normal states
N Bhattacharya1, A Chakrabarti1, B K Mandal2 and C Neogy1,3
Show affiliationsThe ratio of the real (σ1) and imaginary (σ2) parts of the ac conductivity of Y(1−x)PrxBa2Cu3O7−δ (x = 0,0.1,0.3,0.4) in the frequency range 0.5–12 MHz and in the temperature range 78–300 K is measured. The agreement between the experimental and theoretical results suggests that the normal state ac conduction behaviour can be successfully explained using a correlated barrier hopping (CBH) model for polarons as carriers. The CBH process is dominant in the higher frequency range (above 2.5 MHz), and at lower frequencies tunnelling of polarons has to be considered to explain the nature of the variation of 
with ω. This analysis may be considered as supporting evidence for Mott's theory of polaronic conduction in high temperature superconducting materials.
- PACS
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74.25.Fy Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
- Subjects
- Dates
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Issue 12 (December 2009)
Received 10 August 2009
Published 23 October 2009
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Investigation of carriers and ac transport processes in pure and praseodymium doped YBCO in normal states
N Bhattacharya et al 2009 Supercond. Sci. Technol. 22 125013
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