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