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22 papers · 1 filter
SrFeAsF as a parent compound for iron pnictide superconductors
Fei Han, Xiyu Zhu, Gang Mu +2
We have successfully synthesized the fluo-arsenide SrFeAsF, a new parent phase with the ZrCuAsSi structure. The temperature dependence of resistivity and dc magnetization both reve…
Fermi Surface and Band Renormalization in (Sr,K)FeAs Superconductor from Angle-Resolved Photoemission Spectroscopy
Haiyun Liu, Wentao Zhang, Lin Zhao +16
High resolution angle-resolved photoemission measurements have been carried out on (Sr,K)FeAs superconductor (Tc=21 K). Three hole-like Fermi surface sheets are clearly res…
Scanning tunneling spectroscopy of SmFeAsO0.85: Possible evidence for d-wave order parameter symmetry
Oded Millo, Itay Asulin, Ofer Yuli +5
We report a scanning tunneling spectroscopy investigation of polycrystalline SmFeAsO0.85 having a superconducting transition at 52 K. On large regions of the sample surface the tun…
Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2
Huan Yang, Huiqian Luo, Zhaosheng Wang +1
By measuring the magnetization hysteresis loops of superconducting Ba0.6K0.4Fe2As2 single crystals, we obtained the high upper critical field and large current carrying ability, wh…
Point contact Andreev reflection spectroscopy of NdFeAsO_0.85
K A Yates, L F Cohen, Zhi-An Ren +4
The newly discovered oxypnictide family of superconductors show very high critical temperatures of up to 55K. Whilst there is growing evidence that suggests a nodal order parameter…
Magnetization Relaxation and Collective Vortex Pinning in the Fe-Based Superconductor SmFeAsO_0.9F_0.1
Huan Yang, Cong Ren, Lei Shan +1
By measuring the dynamic and traditional magnetization relaxations we investigate the vortex dynamics of the newly discovered superconductor SmFeAsO_0.9F_0.1 with Tc = 55K. It is f…