Nano-structured SmFeAs(O,F) single crystals: Nearly isotropic transport up to 65 T

ORAL

Abstract

Electric 4-probe transport measurements were performed on Focused Ion Beam (FIB) cut single crystals with sub-$\mu$m$^2$ cross-section, with current along and perpendicular to the crystallographic c-axis. The 4-probe geometry was defined accurately, resulting in large signals and excellent signal-to- noise ratio. Our study of the transport properties of SmFeAs (O,F) (T$_c$ $\approx$ 52 K) single crystals reveals a promising combination of high ($>$ 2 10$^6$ A/cm$^2$) and nearly isotropic critical current densities, which agree well with magnetization measurements. We find the onset of resistivity in pulsed fields up to 65T for currents along the c-axis (jIIc) very close to those for currents in the ab-plane. This favorable intragrain current transport in SmFeAs(O,F) is a crucial requirement for possible applications.

*Work at NHMFL-LANL is performed under the auspices of the National Science Foundation, Department of Energy and State of Florida. FIB work was performed at EMEZ, ETH Zurich.

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Authors

  • Philip Moll

    • Laboratory for Solid State Physics, ETH Zurich, Switzerland

  • Roman Puzniak

    • Institute of Physics, Polish Academy of Sciences Warsaw, Poland

  • Fedor Balakirev

    • Los Alamos National Laboratory LANL, Los Alamos, USA

  • J. Karpinski

    • Laboratory for Solid State Physics, ETH Zurich, Switzerland
    • ETH Zurich, Switzerland

  • N. Zhigadlo

    • Laboratory for Solid State Physics, ETH Zurich, Switzerland
    • ETH Zurich, Switzerland

  • B. Batlogg

    • Laboratory for Solid State Physics, ETH Zurich, Switzerland
    • Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland