Physics – Condensed Matter – Superconductivity
Scientific paper
2007-03-28
Phys. Rev. B 75, 184509 (2007)
Physics
Condensed Matter
Superconductivity
5 pages, 6 figures
Scientific paper
10.1103/PhysRevB.75.184509
Measurements of Nernst effect, resistivity and Hall angle on epitaxial films of Y$_{1-x}$Pr$_x$Ba$_2$Cu$_3$O$_{7-\delta}$(Pr-YBCO, 0$\leq x\leq$0.4) are reported over a broad range of temperature and magnetic field. While the Hall and resistivity data suggest a broad pseudogap regime in accordance with earlier results, these first measurements of the Nernst effect on Pr-YBCO show a large signal above the superconducting transition temperature(T$_c$). This effect is attributed to vortex-like excitations in the phase incoherent condensate existing above T$_c$. A correlation between disorder and the width of the phase fluctuation regime has been established for the YBCO family of cuprates, which suggests a T$_c\approx$110K for disorder-free YBa$_2$Cu$_3$O$_{7-\delta}$.
Budhani Ramesh Chandra
Greene Richard L.
Li Pengcheng
Mandal Soumen
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