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Decrease in $$^{111}$$Cd knight shift in superconducting Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$; Evidence for spin-singlet pairing

Sakai, Hironori  ; Tokunaga, Yo ; Kambe, Shinsaku ; Kitagawa, Kentaro*; Murakawa, Hiroshi*; Ishida, Kenji*; Ono, Hiroyuki*; Kato, Masaki*; Yoshimura, Kazuyoshi*; Walstedt, R. E.

$$^{111}$$Cd NMR measurements have been performed in the superconducting (SC) state of the pyrochlore Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$ at T$$_{c}$$ $$sim$$ 1 K, and in a field of less than 3 kOe below $$T_{c}$$. The upper critical field at 0.1 K has been determined to be 4 kOe from in situ measurements of the ac susceptibility. A reduction of the Knight shift in the SC state is confirmed. The present results provide strong evidence that this compound has a singlet SC pairing symmetry.

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Category:Physics, Multidisciplinary

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