Introduction
Our research focuses on superconductivity in high temperature superconducting cuprates. In particular, we are interested in the physics of thermal and quantum phase fluctuations, the superconductor-to-insulator transition, Abrikosov vortices, and the symmetry of the superconducting order parameter. The group makes and studies films and crystals of high-temperature superconductors. Films are made by codeposition with postannealing, sputtering, and pulsed laser deposition. Important measurements include resistivity and magnetic penetration depth as functions of temperature and magnetic field.
Recent News
We currently have open positions for graduate research associates. For more information, please contact Dr.Lemberger or a graduate student.
We successfully produced homogeneous underdoped ultrathin (2unit cells) by doping Cacilum in YBCO. We observed a sharp drop of superfluid density near Tc predicted by the Kosterlitz-Thouless-Berezinski (KTB) theory. The transition temperatures have a sublinear relationship with superfluid density at T=0, which is unlike the linear relationship in thick films. See: Nature physics, 3, 700(2007)
We achieved the first superfluid density measurements in Ni(ferromagnetic) -Nb(superconducting) bilayers and observed a substantial superfluid in ferromagnetic Ni films. See: Journal of Applied Physics 103, 07C701, 2008