title: Superconducting anisotropy in the electron-doped high-Tc superconductors Pr2-xCexCuO4-y.
abstract: We report superconducting anisotropy measurements in the electron-doped high-Tc superconductors (HTSCs) Pr(2-x)Ce(x)C(u)O(4-y) (PCCO, x = 0.15 and 0.17) with an applied magnetic field (H0) up to 28 T. Our results show that the upper critical field [H(c2)(T)] of PCCO is highly anisotropic and as the temperature T → 0, the value of it at H0 ∥ c [H(c2,∥c)(0)] is far less than the Pauli limit. The low temperature anisotropic character of PCCO is found to be rather similar to that of hole-doped cuprate HTSCs, but apparently larger than that of typical Fe-based superconductors. This study also proves a new sensitive probe of detecting rich properties of unconventional superconductors with the use of the resonant frequency of an NMR probe circuit.
authors.affiliation: College of Physics Science and Technology, Yangzhou University, Yangzhou, Jiangsu 225002, People's Republic of China. Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
authors.forename: Guoqing
authors.initials: G
authors.lastname: Wu
authors.forename: R L
authors.initials: RL
authors.lastname: Greene
authors.forename: A P
authors.initials: AP
authors.lastname: Reyes
authors.forename: P L
authors.initials: PL
authors.lastname: Kuhns
authors.forename: W G
authors.initials: WG
authors.lastname: Moulton
authors.forename: Bing
authors.initials: B
authors.lastname: Wu
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.forename: W G
authors.initials: WG
authors.lastname: Clark