Spectroscopic evidence for two-gap superconductivity in the quasi-1D chalcogenide Nb2 Pd0.81S5

Park, Eunsung; Lee, Sangyun; Ronning, Filip; Thompson, Joe D.; Zhang, Qiu; Balicas, Luis; Lu, Xin; Park, Tuson

doi:10.1088/1361-648X/aab5e5

Title: Spectroscopic evidence for two-gap superconductivity in the quasi-1D chalcogenide Nb₂ Pd_0.81S₅

Journal Article · Mon Mar 26 00:00:00 EDT 2018 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/aab5e5· OSTI ID:1479975

Park, Eunsung ^[1];

^[1]; Ronning, Filip ^[2]; Thompson, Joe D. ^[2]; Zhang, Qiu ^[3]; Balicas, Luis ^[3]; Lu, Xin ^[4]; Park, Tuson ^[1]

Sungkyunkwan Univ., Suwon (Republic of Korea). Dept. of Physics, Center for Quantum Materials and Superconductivity (CQMS)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Zhejiang Univ., Hangzhou (China). Center for Correlated Matter and Dept. of Physics

Low-dimensional electronic systems with confined electronic wave functions have attracted interest due to their propensity toward novel quantum phases and their use in wide range of nanotechnologies. The newly discovered chalcogenide Nb₂PdS₅ possesses a quasi-one-dimensional electronic structure and becomes superconducting. Here, we report spectroscopic evidence for two-band superconductivity, where soft point-contact spectroscopic measurements in the superconducting (SC) state reveal Andreev reflection in the differential conductance G. Multiple peaks in G are observed at 1.8 K and explained by the two-band Blonder–Tinkham–Klapwijk model with two gaps Δ₁=0.61 meV and Δ₂=1.20 meV. Finally, the progressive evolution of G with temperature and magnetic field corroborates the multiple nature of the SC gaps.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC52-06NA25396; SC0002613

OSTI ID:: 1479975

Report Number(s):: LA-UR-17-21846

Journal Information:: Journal of Physics. Condensed Matter, Vol. 30, Issue 16; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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36 MATERIALS SCIENCE
Nb2PdS5
two-gap superconductivity
Andreev reflection

Title: Spectroscopic evidence for two-gap superconductivity in the quasi-1D chalcogenide Nb2 Pd0.81S5

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Title: Spectroscopic evidence for two-gap superconductivity in the quasi-1D chalcogenide Nb₂ Pd_0.81S₅