Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 78, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.073704
Keywords
LaFe1-yCoyAsO1-xFx (x=0.11); NMR relaxation rate; 1/T-1; NMR Knight shifts
Categories
Funding
- Japan Society for the Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology
- JST
- TRIP
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NMR longitudinal relaxation rates 1/T-1 and Knight shifts K have been measured for superconducting samples of LaFe1-yCoyAsO1-xFx with y = 0.0 and 0.0075 and for a nonsuperconducting metallic sample with y = 0.1, where the x values are fixed at 0.11. The temperature (T) dependence of 1/T-1 below the superconducting transition temperature T-c has been found to be markedly different from the behavior 1/T-1 proportional to T2.5-3.0 reported by many groups in the entire T range measured [(0.1-0.2) T-c < T < T-c]. The nonexistence of the coherence peak has also been found. On the basis of the results of the measurements and other kinds of existing data, arguments are presented on the superconducting symmetry of the Fe pnictide systems, where the several points that cannot be easily explained by existing theories, are pointed out. Results of the measurements on the nonsuperconducting metallic samples are also presented.
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