Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 4, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.043708
Keywords
K0.8Fe2Se2; superconductivity; NMR
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) [19105006, 20740197, 20102005, 22013011, 22710231]
- Grants-in-Aid for Scientific Research [22013011, 20740197, 22340102, 22710231, 20102005] Funding Source: KAKEN
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We report Se-77-NMR measurements in the recent discovered K0.8Fe2Se2 with the superconducting transition temperature T-c = 32 K. The characteristic point of this system is that the high density of state is located in the vicinity of the Fermi level. The comparison between Knight shift and nuclear spin lattice relaxation rate 1/T-1 shows that the antiferromagnetic spin correlation is not strong in this system, but it is reasonable to consider that its development toward low temperatures occurs. 1/T-1 in the superconducting state can be reproduced well by an s(+/-)-wave model, but a d-wave model also roughly reproduces the data. Non exponential behavior in 1/T-1 at low temperatures disagrees with a single isotropic gap.
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