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6 papers · 2 filters
Evidence for a quantum phase transition in electron-doped PrCeCuO from Thermopower measurements
Pengcheng Li, K. Behnia, R. L. Greene
The evidence for a quantum phase transition under the superconducting dome in the high- cuprates has been controversial. We report low temperature normal state thermopower(S)…
Antiferromagnetic correlations and impurity broadening of NMR linewidths in cuprate superconductors
J. W. Harter, B. M. Andersen, J. Bobroff +2
We study a model of a d-wave superconductor with strong potential scatterers in the presence of antiferromagnetic correlations and apply it to experimental nuclear magnetic resonan…
Observation of the Nernst signal generated by fluctuating Cooper pairs
A. Pourret, H. Aubin, J. Lesueur +4
Long-range order is destroyed in a superconductor warmed above its critical temperature (Tc). However, amplitude fluctuations of the superconducting order parameter survive and lea…
Optical determination of the superconducting energy gap in electron-doped Pr_{1.85}Ce_{0.15}CuO_4
C. C. Homes, R. P. S. M. Lobo, P. Fournier +2
The optical properties of single crystal Pr_{1.85}Ce_{0.15}CuO_4 have been measured over a wide frequency range above and below the critical temperature (T_c \simeq 20 K). In the n…
Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates
M. Le Tacon, A. Sacuto, A. Georges +4
The superconducting state of underdoped cuprates is often described in terms of a single energy-scale, associated with the maximum of the (d-wave) gap. Here, we report on electroni…
Magnetic field-induced quantum superconductor-insulator transition in
H. Aubin, C. A. Marrache-Kikuchi, A. Pourret +4
A study of magnetic-field tuned superconductor-insulator transitions in amorphous thin films shows that quantum superconductor-insulator transitions are charac…