Effect of Oxygen Redistribution on Temperature Dependence of Pseudo-Gap in Underdoped HoBa2Cu3O7-δ Single Crystals
R.V. Vovka, Z.F. Nazyrova, M.A. Obolenskiia, V.M. Pinto Simoesb, M. Januszczykc and J.N. Latosińskac
aKharkov National University, 4 Svoboda Sq., 61077 Kharkov, Ukraine
bIPA_Instituto Superior Autónomo de Estudos Politécnicos, Rua de Xabregas, 20, 1° 1900-440 Lisboa, Portugal
cInstitute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
Received: January 7, 2011; In final form: March 20, 2011
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The effect of annealing at room temperature on the excess conductivity of oxygen deficient HoBa2Cu3O7 - δ single crystal is studied. It is shown that there is substantial extension of the interval of linear dependence ρab (T) and narrowing of the temperature area of the pseudo-gap regime as a result of annealing. The excess conductivity satisfies the exponential temperature dependence in a wide temperature interval. The temperature dependence of the pseudogap is satisfactorily described by the BCS-BEC theoretical model.
DOI: 10.12693/APhysPolA.120.512
PACS numbers: 74.72.-h