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Title: R h 2 M o 3 N : Noncentrosymmetric s -wave superconductor

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1388927
DOE Contract Number:
SC0012670
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 94; Journal Issue: 10; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin
Country of Publication:
United States
Language:
English
Subject:
phonons, thermal conductivity, thermoelectric, spin dynamics, spintronics

Citation Formats

Wei, Wensen, Zhao, G. J., Kim, D. R., Jin, Chiming, Zhang, J. L., Ling, Langsheng, Zhang, Lei, Du, Haifeng, Chen, T. Y., Zang, Jiadong, Tian, Mingliang, Chien, C. L., and Zhang, Yuheng. Rh2Mo3N : Noncentrosymmetric s-wave superconductor. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.104503.
Wei, Wensen, Zhao, G. J., Kim, D. R., Jin, Chiming, Zhang, J. L., Ling, Langsheng, Zhang, Lei, Du, Haifeng, Chen, T. Y., Zang, Jiadong, Tian, Mingliang, Chien, C. L., & Zhang, Yuheng. Rh2Mo3N : Noncentrosymmetric s-wave superconductor. United States. doi:10.1103/PhysRevB.94.104503.
Wei, Wensen, Zhao, G. J., Kim, D. R., Jin, Chiming, Zhang, J. L., Ling, Langsheng, Zhang, Lei, Du, Haifeng, Chen, T. Y., Zang, Jiadong, Tian, Mingliang, Chien, C. L., and Zhang, Yuheng. 2016. "Rh2Mo3N : Noncentrosymmetric s-wave superconductor". United States. doi:10.1103/PhysRevB.94.104503.
@article{osti_1388927,
title = {Rh2Mo3N : Noncentrosymmetric s-wave superconductor},
author = {Wei, Wensen and Zhao, G. J. and Kim, D. R. and Jin, Chiming and Zhang, J. L. and Ling, Langsheng and Zhang, Lei and Du, Haifeng and Chen, T. Y. and Zang, Jiadong and Tian, Mingliang and Chien, C. L. and Zhang, Yuheng},
abstractNote = {},
doi = {10.1103/PhysRevB.94.104503},
journal = {Physical Review B},
number = 10,
volume = 94,
place = {United States},
year = 2016,
month = 9
}
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  • We report comprehensive 77 Se NMR measurements on a single crystalline sample of the recently discovered FeSe-based high-temperature superconductor K x Fe 2 - y Se 2 ( T c = 33 K) in a broad temperature range up to 290 K. Despite deviations from the stoichiometric KFe 2 Se 2 composition, we observed 77 Se NMR line shapes as narrow as 4.5 kHz under a magnetic field applied along the crystal c axis, and found no evidence for co-existence of magnetic order with superconductivity. On the other hand, the 77 Se NMR line shape splits into two peaks withmore » equal intensities at all temperatures when we apply the magnetic field along the ab plane. This suggests that K vacancies may have a superstructure and that the local symmetry of the Se sites is lower than the tetragonal fourfold symmetry of the average structure. This effect might be a prerequisite for stabilizing the s ± symmetry of superconductivity in the absence of the hole bands at the Brillouin zone center. From the increase of NMR linewidth below T c induced by the Abrikosov lattice of superconducting vortices, we estimate the in-plane penetration depth λ ab ~ 290 nm and the carrier concentration n e ~ 1 × 10 + 21 cm - 3 . Our Knight shift 77 K data indicate that the uniform spin susceptibility decreases progressively with temperature, in analogy with the case of FeSe ( T c ~ 9 K) as well as other FeAs high- T c systems. The strong suppression of 77 K observed immediately below T c for all crystal orientations is consistent with a singlet pairing of Cooper pairs. We do not however observe the Hebel-Slichter coherence peak of the nuclear spin-lattice relaxation rate 1 / T 1 immediately below T c , expected for conventional BCS s-wave superconductors. In contrast with the case of FeSe, we do not observe evidence for an enhancement of low-frequency antiferromagnetic spin fluctuations near T c in 1 / T 1 T . Instead, 1 / T 1 T exhibits qualitatively the same behavior as overdoped non-superconducting Ba(Fe 1 - x Co x ) 2 As 2 with x ~ 0 . 14 or greater, where hole bands are missing in the Brillouin zone center. We will discuss the implications of our results on the unknown mechanism of high-temperature superconductivity in FeSe and FeAs systems.« less
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