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Low Temperature Anharmonicity and Superconductivity in Cuprates

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Abstract

Temperature-dependent X-ray absorption spectra of the hole-doped La2−x Sr x CuO4 and electron-doped Nd2−x Ce x CuO4−δ high-temperature superconductors were investigated above the Cu K absorption edge. We observed strong anharmonicity in the superconductive CuO2 plane. For x=0.15 it was shown that part of oxygen ions oscillate in a double-well potential and their vibrations are correlated with the local electron (hole) pair transfer. We suppose that at a low temperature the phase coherence of the local pair movement is determined by the peculiarities of the perovskite-like structure which includes the stiff CuO n (n=4,6) complexes combined by collective rotational and breathing modes.

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Acknowledgements

This work was partly supported by Russian Foundation for Basic Researches (Grant 12-02-12077-ofi_m).

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Authors and Affiliations

  1. National Research Nuclear University “MEPhI”, 115409, Moscow, Russia

    A. P. Menushenkov, A. V. Kuznetsov, A. A. Ivanov & V. V. Sidorov

  2. HASYLAB at DESY, 22603, Hamburg, Germany

    R. V. Chernikov

  3. MAX-Lab, Lund University, P.O. Box 118, Lund, 22100, Sweden

    K. V. Klementiev

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  1. A. P. Menushenkov
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  2. A. V. Kuznetsov
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  3. R. V. Chernikov
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  4. A. A. Ivanov
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  5. V. V. Sidorov
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  6. K. V. Klementiev
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Correspondence to A. P. Menushenkov.

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Menushenkov, A.P., Kuznetsov, A.V., Chernikov, R.V. et al. Low Temperature Anharmonicity and Superconductivity in Cuprates. J Supercond Nov Magn 27, 925–928 (2014). https://doi.org/10.1007/s10948-013-2411-1

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  • DOI: https://doi.org/10.1007/s10948-013-2411-1

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