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Strong Suppression of Coherence Effect and Appearance of Pseudogap in Layered Nitride Superconductor Li_xZrNCl: ^91Zr- and ^15N- NMR Studies

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arxiv 1407.3031 v1 pith:NPO64XV5 submitted 2014-07-11 cond-mat.supr-con

Hisashi Kotegawa , Satoru Oshiro , Yuki Shimizu , Hideki Tou , Yuichi Kasahara , Tsukasa Kishiume , Yasujiro Taguchi , Yoshihiro Iwasa This is my paper
classification cond-mat.supr-con
keywords xzrnclpseudogapcoherencelayerednitridestatesuperconductorachieved
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We present NMR measurements of the layered nitride superconductor Li_xZrNCl. The nuclear spin-lattice relaxation rate, 1/T_1, shows that the coherence peak is strongly suppressed in Li_xZrNCl in contrast to conventional BCS superconductors. In the lightly-doped region close to the insulating state, the system shows a gap-like behavior, i.e., pseudogap, that is characterized by a reduction in the magnitude of the Knight shift and 1/T_1T. A higher superconducting (SC) transition temperature, T_c, is achieved by coexisting with the pseudogap state. These unusual behaviors, which deviate from the ordinary BCS framework, are the key ingredients to understanding the SC mechanism of Li_xZrNCl.

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