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

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 similar to 0.46 hole/Cu, well beyond the T-c-p superconducting dome of cuprates, where Fermi-liquid behavior is expected. Surprisingly, we find bulk superconductivity with T-c = 84 K and superfluid density similar to those of optimally doped YBa2Cu3O7-delta. On the other hand, specific heat data display a large electronic contribution at low temperature, comparable to that of nonsuperconducting overdoped La2-x SrxCuO4. These results point at an unusual high-T-c 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 T-c of cuprates originates from a non-Fermi-liquid ground state.

Keywords

ELECTRONIC SPECIFIC-HEAT, CRITICAL-TEMPERATURE, SUPERFLUID DENSITY, COPPER OXIDES, YBA2CU3O7-DELTA, DEPENDENCE, OXYGEN, MO, TC

DOI

10.1103/PhysRevB.94.180509

Citation

Gauzzi, A, Klein, Y, Nisula, M, Karppinen, M, Biswas, P K, Saadaoui, H, Morenzoni, E, Manuel, P, Khalyavin, D, Marezio, M & Geballe, T H 2016, ' Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates ', Physical Review B, vol. 94, no. 18, 180509 . https://doi.org/10.1103/PhysRevB.94.180509

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https://urn.fi/URN:NBN:fi:aalto-201701191099

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[article-cris] Kemian tekniikan korkeakoulu / CHEM

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

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