期刊
PHYSICAL REVIEW B
卷 90, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.020503
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [24340085, 19204036, 20045010, 22013011, 25000003]
- Strategic International Collaborative Research Program (SICORP-LEMSUPER) of the Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [25000003, 19204036, 26400359, 22013011, 20045010] Funding Source: KAKEN
We present NMR measurements of the layered nitride superconductor LixZrNCl. The nuclear spin- lattice relaxation rate 1/T-1 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 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 LixZrNCl.
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