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Pairing type change upon an increase in the cerium doping level in the Nd2 − x Ce x CuO4 + δ electronic superconductor

  • Order, Disorder, and Phase Transition in Condensed System
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Abstract

We report on the results of analyzing the temperature dependences of the resistivity of the Nd2 − x Ce x CuO4 + δ 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 ‖ c, J ‖ 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 \((dH_{c2} /dT)|_{T_c } \) on the degree of disorder in the Nd2 − x Ce x CuO4 + δ system upon a change in the cerium doping level indicate a change in the symmetry of d-type pairing to anisotropic s pairing.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia

    T. B. Charikova, G. I. Kharus, N. G. Shelushinina & O. E. Petukhova

  2. National Research Nuclear University MEPhI, Moscow, 115410, Russia

    A. A. Ivanov

Authors
  1. T. B. Charikova
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  2. G. I. Kharus
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  3. N. G. Shelushinina
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  4. O. E. Petukhova
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  5. A. A. Ivanov
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Correspondence to T. B. Charikova.

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Original Russian Text © T.B. Charikova, G.I. Kharus, N.G. Shelushinina, O.E. Petukhova, A.A. Ivanov, 2012, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2012, Vol. 141, No. 3, pp. 564–571.

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Charikova, T.B., Kharus, G.I., Shelushinina, N.G. et al. Pairing type change upon an increase in the cerium doping level in the Nd2 − x Ce x CuO4 + δ electronic superconductor. J. Exp. Theor. Phys. 114, 496–502 (2012). https://doi.org/10.1134/S1063776112020173

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  • DOI: https://doi.org/10.1134/S1063776112020173

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