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Upper critical fields and thermally-activated transport of Nd(O_0.7F_0.3)FeAs single crystal
J. Jaroszynski, F. Hunte, L. Balicas +9
We present measurements of the resistivity and the upper critical field H_c2 of Nd(O_0.7F_0.3)FeAs single crystals in strong DC and pulsed magnetic fields up to 45 T and 60 T, resp…
Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1-xCox)2As2
A. Yamamoto, J. Jaroszynski, C. Tarantini +10
We performed high-field magnetotransport and magnetization measurements on a single crystal of the 122-phase iron pnictide Ba(Fe1-xCox)2As2. Unlike the HTS cuprates and 1111-phase…
Probing multi-band superconductivity and magnetism in SmFeAsOF single crystals by high-field vortex torque magnetometry
L. Balicas, A. Gurevich, Y. J. Jo +9
To probe manifestations of multiband superconductivity in oxypnictides, we measured the angular dependence of magnetic torque in the mixed state of SmOFFeAs…
Evidence for two distinct scales of current flow in polycrystalline Sm and Nd iron oxypnictides
A. Yamamoto, A. A. Polyanskii, J. Jiang +13
Early studies have found quasi-reversible magnetization curves in polycrystalline bulk rare-earth iron oxypnictides that suggest either wide-spread obstacles to intergranular curre…
Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO0.89F0.11FeAs
A. Yamamoto, J. Jiang, C. Tarantini +13
The new rare-earth arsenate superconductors are layered, low carrier density compounds with many similarities to the high-Tc cuprates. An important question is whether they also ex…
Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
F. Hunte, J. Jaroszynski, A. Gurevich +7
The ongoing search for new superconductors has recently yielded a new family of oxypnictides composed of alternating La_2O_{2-x}F_x and Fe_2As_2 layers [1-4] with transition temper…