Superconducting anisotropy in the electron-doped high-T${}_c$ superconductors Pr${}_{2-x}$Ce${}_x$CuO${}_{4-y}$

Abstract

We report superconducting anisotropy measurements in the electron-doped high-$T_c$ superconductors (HTSCs) Pr${}_{2-x}$Ce${}_x$CuO${}_{4-y}$ (PCCO, $x$ = 0.15 and 0.17) with applied magnetic field ($H_0$) up to 28 T. Our results show that the upper critical field [$H_{c2}(T)$] is highly anisotropic, and as temperature $T$ $\to$ 0 the value of it at $H_0$ $\parallel$ $c$ [$H_{c2,\parallel c}$(0)] is far less than the Pauli limit, which is very different from that at $H_0$ $\perp$ $c$. The $H_{c2}(0)$ character along with the evaluated zero $T$ coherence length $[{\xi }_{ab(c)}(0)]$ and penetration depth $[{\lambda }_{ab(c)}(0)]$ is compared with those of the hole-doped cuprate HTSCs and typical Fe-based superconductors. We find that the low temperature anisotropic character of PCCO is 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 a NMR probe circuit.

7 pages and 7 figures. Peer-reviewed. To appear in J. Appl. Phys. in 2014

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Cited by in corpus (5)

• Nodal superconducting exchange coupling
• Magnetic exchange fields and domain wall superconductivity at an all-oxide superconductor / ferromagnet insulator interface
• Internal static electric and magnetic field at the copper cite in a single crystal of the electron-doped high-T${}_c$ superconductor Pr${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-y}$
• Upper critical fields in high-$T_{\mathrm{c}}$ superconductors
• Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO${}_{0.5}$F${}_{0.5}$BiS${}_2$