Normal state conduction in Gd(Ba 2–x Pr x )Cu 3 O 7+δ

M. Mohammadizadeh and M. Akhavan ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2003, vol. 33, issue 4, 381-390

Abstract: The normal state resistivity of single phase polycrystalline Gd(Ba 2–x Pr x )Cu 3 O 7+δ samples with 0.0≤x≤0.50 have been investigated. There is a distinct metal-insulator transition at % MathType!MTEF!2!1!+- % feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiEamaaDa % aaleaacaWGJbaabaGaaeytaiaabMeacaqGubaaaOGaeyypa0JaaGim % aiaac6cacaaIYaaaaa!3DA8! $$ x_c^{{\rm{MIT}}} =0.2 $$ and a superconductor-insulator transition at % MathType!MTEF!2!1!+- % feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiEamaaDa % aaleaacaWGJbaabaGaae4uaiaabMeacaqGubaaaOGaeyypa0JaaGim % aiaac6cacaaIZaGaaGynaaaa!3E6E! $$ x_c^{{\rm{SIT}}} =0.35 $$ with the increase of x. The two-dimensional variable range hopping is dominant in the normal state resistivity of the samples. The localization length, hopping range, and hopping energy of carriers show that Pr doping strongly localizes the carriers in normal state, and finally causes the suppression of superconductivity. Copyright EDP Sciences, Springer-Verlag 2003

Keywords: 74.25.Fy Transport properties (electric and thermal conductivity; thermoelectric effects; etc.); 74.72.Bk Y-based cuprates; 71.30.+h Metal-insulator transitions and other electronic transitions (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1140/epjb/e2003-00179-2

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