Pairing type change upon an increase in the cerium doping level in the Nd{sub 2-x}Ce{sub x}CuO{sub 4+{delta}} electronic superconductor

We report on the results of analyzing the temperature dependences of the resistivity of the Nd{sub 2-x}Ce{sub x}CuO{sub 4+{delta}} electronic superconductor with x = 0.14 (underdoped range), x = 0.15 (optimal doping), and x = 0.18 (overdoped range) and with various degrees of annealing in an oxygen-...

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Bibliographic Details
Published inJournal of experimental and theoretical physics Vol. 114; no. 3
Main Authors Charikova, T. B., Kharus, G. I., Shelushinina, N. G., Petukhova, O. E., Ivanov, A. A.
Format Journal Article
LanguageEnglish
Published United States 15.03.2012
Subjects
ANISOTROPY
ANNEALING
CERIUM
CERIUM COMPOUNDS
CONCENTRATION RATIO
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL FIELD
CRYSTAL DOPING
CUPRATES
ELECTRIC CONDUCTIVITY
NEODYMIUM COMPOUNDS
OXYGEN
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
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Summary:We report on the results of analyzing the temperature dependences of the resistivity of the Nd{sub 2-x}Ce{sub x}CuO{sub 4+{delta}} electronic superconductor with x = 0.14 (underdoped range), x = 0.15 (optimal doping), and x = 0.18 (overdoped range) and with various degrees of annealing in an oxygen-free atmosphere in magnetic fields up to H = 90 kOe (H Double-Vertical-Line c, J Double-Vertical-Line ab) in the temperature range T = (0.4-300) K. It is shown that the observed differences in the dependences of the slope of the upper critical field dH{sub c2}/dT)|{sub Tc} on the degree of disorder in the Nd{sub 2-x}Ce{sub x}CuO{sub 4+{delta}} system upon a change in the cerium doping level indicate a change in the symmetry of d-type pairing to anisotropic s pairing.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776112020173