115In-NMR measurements of the unconventional superconductor CeCoIn\(_5\) reveal an unusual temperature dependence of the Knight shift near the upper limit of \(H_{c2}\). From a simulation analysis, the present NMR study provides a direct evidence at a microscopic point of view that the Fulde–Ferrell–Larkin–Ovchinikov (FFLO) state is realized at the high field SC phase in CeCoIn\(_5\).
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ACKNOWLEDGMENTS
We thank T. Kita, A. Kawamoto, and Y. Furukawa for stimulating discussions. The present work is supported by a grant-in-aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
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Kumagai, Ki., Kakuyanagi, K., Saitoh, M. et al. Microscopic Evidence of the FFLO State in Unconventional Superconductor CeCoIn\(_5\): Study of 115In-NMR. J Supercond 19, 1–4 (2006). https://doi.org/10.1007/s10948-005-0086-y
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DOI: https://doi.org/10.1007/s10948-005-0086-y