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

A. Gauzzi; Y. Klein; M. Nisula; M. Karppinen; P. K. Biswas; H. Saadaoui; E. Morenzoni; P. Manuel; D. Khalyavin; M. Marezio; T. H. Geballe

doi:10.1103/PhysRevB.94.180509

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

A. Gauzzi^*
, Y. Klein
, M. Nisula
, M. Karppinen
, P. K. Biswas
, H. Saadaoui
, E. Morenzoni
, P. Manuel
, D. Khalyavin
, M. Marezio
, T. H. Geballe

^*Corresponding author for this work

Sorbonne Université
Paul Scherrer Institute
Rutherford Appleton Laboratory
Institut Néel
Stanford University

Research output: Contribution to journal › Article › Scientific › peer-review

28 Citations (Scopus)

328 Downloads (Pure)

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 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.

Original language	English
Article number	180509
Number of pages	5
Journal	Physical Review B
Volume	94
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.94.180509
Publication status	Published - 22 Nov 2016
MoE publication type	A1 Journal article-refereed

Funding

A.G. and M.N. acknowledge A. Daoud Aladine for his help in the structural refinement work. A.G. acknowledges fruitful discussions with M. Grilli, S. Caprara, and Y.J. Uemura. T.H.G. is thankful for valuable input from S. A. Kivelson, S. Raghu, and I. Bozovic during the course of this work, and for support by the DOE, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF0051.

Keywords

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

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PhysRevB.94Final published version, 610 KB

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title = "Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates",

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 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.",

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year = "2016",

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doi = "10.1103/PhysRevB.94.180509",

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AU - Gauzzi, A.

AU - Klein, Y.

AU - Nisula, M.

AU - Karppinen, M.

AU - Biswas, P. K.

AU - Saadaoui, H.

AU - Morenzoni, E.

AU - Manuel, P.

AU - Khalyavin, D.

AU - Marezio, M.

AU - Geballe, T. H.

PY - 2016/11/22

Y1 - 2016/11/22

N2 - 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.

AB - 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.

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KW - TC

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JO - Physical Review B

JF - Physical Review B

IS - 18

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

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