TY - JOUR
T1 - Tc Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates
AU - Hemmatzade, Amirreza
AU - Medina, Elena
AU - Delbes, Ludovic
AU - Baptiste, Benoît
AU - Hrabovsky, David
AU - Klein, Yannick
AU - Conradson, Steven D.
AU - Karppinen, Maarit
AU - Gauzzi, Andrea
N1 - Funding Information:
This research has been partially funded by the “SUPERSTRONG” project of the French National Agency for Research (ANR) under contract no. ANR-22-CE30-0010.
Publisher Copyright:
© 2023 by the authors.
PY - 2023/7/5
Y1 - 2023/7/5
N2 - In order to elucidate the unusual superconducting properties of cuprates in the strongly overdoped region, i.e., at hole-doping levels (Formula presented.) /Cu in the CuO (Formula presented.) plane, we study the structural and superconducting properties of a series of Cu (Formula presented.) Mo (Formula presented.) Sr (Formula presented.) YCu (Formula presented.) O (Formula presented.) powder samples oxygenated under high pressure using different concentrations of KClO (Formula presented.) up to 35 mol %. The analysis of X-ray diffraction data indicates a high purity ∼90% of all samples and suggests that the concentration, x, of extra oxygen atoms increases with increasing KClO (Formula presented.) concentration. Surprisingly, the (Formula presented.) values remain nearly constant within the 80–85 K range independent of KClO (Formula presented.) concentration, which suggests a scenario of (Formula presented.) saturation. In order to account for this unexpected behaviour, we put forward the hypothesis that overdoping enhances the density of unpaired holes, which is supported by the observation of large values of the Sommerfeld coefficient in all samples. We therefore propose a scenario of electronic phase separation between normal and superconducting holes.
AB - In order to elucidate the unusual superconducting properties of cuprates in the strongly overdoped region, i.e., at hole-doping levels (Formula presented.) /Cu in the CuO (Formula presented.) plane, we study the structural and superconducting properties of a series of Cu (Formula presented.) Mo (Formula presented.) Sr (Formula presented.) YCu (Formula presented.) O (Formula presented.) powder samples oxygenated under high pressure using different concentrations of KClO (Formula presented.) up to 35 mol %. The analysis of X-ray diffraction data indicates a high purity ∼90% of all samples and suggests that the concentration, x, of extra oxygen atoms increases with increasing KClO (Formula presented.) concentration. Surprisingly, the (Formula presented.) values remain nearly constant within the 80–85 K range independent of KClO (Formula presented.) concentration, which suggests a scenario of (Formula presented.) saturation. In order to account for this unexpected behaviour, we put forward the hypothesis that overdoping enhances the density of unpaired holes, which is supported by the observation of large values of the Sommerfeld coefficient in all samples. We therefore propose a scenario of electronic phase separation between normal and superconducting holes.
KW - electronic phase separation
KW - overdoping
KW - superconducting cuprates
UR - http://www.scopus.com/inward/record.url?scp=85172882145&partnerID=8YFLogxK
U2 - 10.3390/condmat8030056
DO - 10.3390/condmat8030056
M3 - Article
AN - SCOPUS:85172882145
SN - 2410-3896
VL - 8
JO - Condensed Matter
JF - Condensed Matter
IS - 3
M1 - 56
ER -