Strong suppression of coherence effect and appearance of pseudogap in the layered nitride superconductor LixZrNCl: Zr91- and N15-NMR studies
Hisashi Kotegawa, Satoru Oshiro, Yuki Shimizu, Hideki Tou, Yuichi Kasahara, Tsukasa Kishiume, Yasujiro Taguchi, Yoshihiro Iwasa
DOI 10.1103/PhysRevB.90.020503 · Physical Review B
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Abstract
We present NMR measurements of the layered nitride superconductor LixZrNCl. The nuclear spin-lattice relaxation rate 1/T1 shows that the coherence peak is strongly suppressed in LixZrNCl in contrast to conventional BCS superconductors. In the lightly doped region close to the insulating state, the system shows a gaplike behavior, i.e., pseudogap, that is characterized by a reduction in the magnitude of the Knight shift and 1/T1T. A higher superconducting (SC) transition temperature Tc 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 LixZrNCl.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LixZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | onset |
| Li0.08ZrNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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