75 As NQR and NMR measurements of Ca10Pt 4As8 (Fe1-xPtxAs)10 with the superconducting transition temperature Tc = 33.4K have been carried out. The observed 75As NQR spectra can be divided into those from As sites in (Fe1-xPtx)As and PtAs2 layers. From the NQR spectra of 75As in the (Fe1-xPt xAs) layers, x is found to be ∼20%, indicating that the superconductivity is robust against nonmagnetic impurities. This contradicts the existence of the sign reversal of the order parameter in the system. The 75As nuclear spin-lattice relaxation rates 1/T1's from the (Fe 1-xPtx)As and PtAs2 layers indicate that the PtAs2 layers are in a nonmetallic state and do not contribute to the occurrence of the superconductivity.
ASJC Scopus subject areas
- Physics and Astronomy(all)