Effects of d-wave pairing in n-type high-temperature superconductors with anisotropic impurity scattering |
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| Authors: | T. B. Charikova N. G. Shelushinina G. I. Kharus O. E. Sochinskaya A. A. Ivanov |
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| Affiliation: | 1.Institute of Metal Physics, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia;2.Moscow Engineering Physics Institute (State University),Moscow,Russia |
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| Abstract: | The temperature dependences of the resistivity of single-crystal films of the Nd2 − x Ce x CuO4 + δ n-type superconductors with x = 0.14 (underdoped region) and x = 0.15 (optimal doping region) and different degrees of disorder δ have been investigated in various magnetic fields (B ‖ c, J ‖ ab) in the temperature range 0.4–300 K. It has been demonstrated that there are differences in the behavior of the dependences of the slope of the upper critical field $
(dB_{c2} /dT)_{T to T_c }
$
(dB_{c2} /dT)_{T to T_c }
on the disorder parameter for the underdoped samples (x = 0.14) and the samples with the optimal doping (x = 0.15). The study of the dependence of the slope of the upper critical field on the degree of disorder has made it possible to discriminate experimentally between the superconductors with the d pairing and anisotropic s pairing. It has been revealed that the relative stability of the n-type superconductor with the optimal doping with respect to disordering is possibly due to the strong anisotropy of impurity scattering with symmetry of the d type. |
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