Crystal Structure and Antiferromagnetic Order in NdFeAsO 1-x F x (x=0.0 and 0.2) Superconducting Compounds from Neutron Diffraction Measurements
作者： Y. Qiu , Wei Bao , Q. Huang , T. Yildirim , J. M. Simmons
DOI: 10.1103/PHYSREVLETT.101.257002
关键词: Lanthanide 、 Crystal structure 、 Neutron diffraction 、 Condensed matter physics 、 Magnetism 、 Superconductivity 、 Rietveld refinement 、 Materials science 、 Transition temperature 、 Antiferromagnetism
摘要: The transition temperature TC � 26 K of the recently discovered superconductor LaFeAsO1� xFx is extremely sensitive to lanthanide ion, reaching 55 for Sm containing oxypnictides. Therefore, it important determine how moment on affects overall magnetism in these systems. Here we report a neutron diffraction study Nd Long-ranged antiferromagnetic order apparent NdFeAsO below 1.96 K. Rietveld refinement shows that both Fe and magnetic ordering are required describe observed data with staggered 1:55ð4Þ� B=Nd 0:9ð1Þ� B=Fe at 0.3 other structural properties such as tetragonal-orthorhombic distortion found be very similar those LaFeAsO. Neither nor occur superconducting sample NdFeAsO0:80F0:20 any temperatures down 1.5
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