Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates - Sorbonne Université
Journal Articles Physical Review B Year : 2016

Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates

Y. Klein
M. Nisula
  • Function : Author
M. Karppinen
  • Function : Author
P. Manuel
  • Function : Author
D. Khalyavin
  • Function : Author

Abstract

By means of magnetization, specific heat, and muon-spin relaxation measurements, we investigate newly synthesized high-pressure oxidized Cu0.75Mo0.25Sr2YCu2O7.54, in which overdoping is achieved up to p∼0.46 hole/Cu, well beyond the Tc−p superconducting dome of cuprates, where Fermi-liquid behavior is expected. Surprisingly, we find bulk superconductivity with Tc=84 K and superfluid density similar to those of optimally doped YBa2Cu3O7−δ. On the other hand, specific heat data display a large electronic contribution at low temperature, comparable to that of nonsuperconducting overdoped La2−xSrxCuO4. These results point at an unusual high-Tc phase with a large fraction of unpaired holes. Further experiments may assess the Fermi-liquid properties of the present phase, which would put into question the paradigm that the high Tc of cuprates originates from a non-Fermi-liquid ground state.
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Dates and versions

hal-01420833 , version 1 (16-02-2022)

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A. Gauzzi, Y. Klein, M. Nisula, M. Karppinen, P. Biswas, et al.. Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates. Physical Review B, 2016, 94 (18), pp.180509(R). ⟨10.1103/PhysRevB.94.180509⟩. ⟨hal-01420833⟩
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