Epitaxial growth and superconducting anisotropy of PbSr$_{2}$Y$_{1-x}$Ca$_{x}$Cu$_{2}$O$_{7+δ}$ thin films

Sachio Komori; Ryotaro Inaba; Kentaro Kaneko; Shizuo Fujita; Itsuhiro Kakeya; Minoru Suzuki

doi:10.1103/PhysRevB.89.174509

paper

Epitaxial growth and superconducting anisotropy of PbSr $_{2}$ Y $_{1 - x}$ Ca $_{x}$ Cu $_{2}$ O $_{7 + δ}$ thin films

arXiv:1403.8004 · doi:10.1103/PhysRevB.89.174509

Abstract

Thin films of single-crystal Pb $_{1 - y}$ Bi $_{y}$ Sr $_{2}$ Y $_{1 - x}$ Ca $_{x}$ Cu $_{2}$ O $_{7 + δ}$ (PbBi1212) were grown on SrTiO $_{3}$ (100) substrates by a two-step growth technique in which an amorphous film is annealed at 970 $^{\circ}$ C in a closed ceramic container prepared using the same material as the film. We find that PbBi1212 exhibits superconductivity when the Ca concentration $x$ exceeds 0.3. The effective number of holes per Cu atom $n_{eff}$ is well described as $n_{eff} = 0.34 x$ . The highest onset temperature for the superconducting transition attained in the present study is 65 K. The resistivity measurement in a magnetic field reveals that the coherence lengths of Pb1212 ( $y = 0$ ) are approximately 25 and 2.7 Å, along the $ab$ plane and the $c$ axis, respectively.

Epitaxial growth and superconducting anisotropy of PbSr2​Y1−x​Cax​Cu2​O7+δ​ thin films

Abstract

Epitaxial growth and superconducting anisotropy of PbSr $_{2}$ Y $_{1 - x}$ Ca $_{x}$ Cu $_{2}$ O $_{7 + δ}$ thin films