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Investigation of superconducting gap structure in TbFeAsO 0.9 F 0.1 using point contact Andreev reflection

2009; IOP Publishing; Volume: 11; Issue: 2 Linguagem: Inglês

10.1088/1367-2630/11/2/025015

1367-2630

K. A. Yates, K. Morrison, Jennifer Rodgers, George B. S. Penny, Jan‐Willem G. Bos, J. Paul Attfield, L. F. Cohen,

Rare-earth and actinide compounds

Bulk samples of TbFeAsO0.9 F0.1 (Tcon = 50 K) were measured by point contact Andreev reflection spectroscopy. The spectra show unambiguous evidence for multiple gap-like features plus the presence of high-bias shoulders. By measuring the spectra as a function of temperature with both gold and superconducting niobium tips, we establish that the gap-like features are associated with the superconducting order parameter in this material. We discuss whether the well-defined zero-bias conductance peak that we observe infrequently is associated with a nodal superconducting order parameter.