Spectroscopic evidence for the direct involvement of local moments in the pairing process of the heavy-fermion superconductor CeCoIn 5
Abstract
The microscopic mechanism for electron pairing in heavy-fermion superconductors remains a major challenge in quantum materials. Some form of magnetic mediation is widely accepted with spin fluctuations as a prime candidate. A novel mechanism, “composite pairing” based on the cooperative two-channel Kondo effect directly involving the -electron moments, has also been proposed for some heavy-fermion compounds including . The origin of the spin-resonance peak observed in neutron-scattering measurements on is still controversial and the corresponding hump-dip structure in the tunneling conductance is missing. This is in contrast to the cuprate and Fe-based high-temperature superconductors, where both characteristic signatures are observed, indicating spin fluctuations are likely involved in the pairing process. In this study, we report results from planar tunneling spectroscopy along three major crystallographic orientations of over wide ranges of temperature and magnetic field. The pairing gap opens at , well above the bulk , and its directional dependence is consistent with symmetry. With increasing magnetic field, this pairing gap is suppressed as expected but, intriguingly, a gaplike structure emerges smoothly, increasing linearly up to the highest field applied. This field-induced gaplike feature is only observed below . The concomitant appearance of the pairing gap and the field-induced gaplike feature, along with its linear increase with field, indicates that the -electron local moments are directly involved in the pairing process in .
- Authors:
-
[1];
[1];
[1]
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Univ. of California, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States); Florida State Univ., Tallahassee, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1849526
- Grant/Contract Number:
- FG02-04ER46105; SC0016568; DMR-1704712; DMR-1644779; DMR-1206553
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 22; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; kondo effect; pairing mechanisms; pseudogap; superconducting gap; d-wave; heavy-fermion systems; tunnel junctions
Citation Formats
Shrestha, K., Zhang, S., Greene, L. H., Lai, Y., Baumbach, R. E., Sasmal, K., Maple, M. B., and Park, W. K. Spectroscopic evidence for the direct involvement of local moments in the pairing process of the heavy-fermion superconductor CeCoIn5. United States: N. p., 2021.
Web. doi:10.1103/physrevb.103.224515.
Shrestha, K., Zhang, S., Greene, L. H., Lai, Y., Baumbach, R. E., Sasmal, K., Maple, M. B., & Park, W. K. Spectroscopic evidence for the direct involvement of local moments in the pairing process of the heavy-fermion superconductor CeCoIn5. United States. https://doi.org/10.1103/physrevb.103.224515
Shrestha, K., Zhang, S., Greene, L. H., Lai, Y., Baumbach, R. E., Sasmal, K., Maple, M. B., and Park, W. K. Thu .
"Spectroscopic evidence for the direct involvement of local moments in the pairing process of the heavy-fermion superconductor CeCoIn5". United States. https://doi.org/10.1103/physrevb.103.224515. https://www.osti.gov/servlets/purl/1849526.
@article{osti_1849526,
title = {Spectroscopic evidence for the direct involvement of local moments in the pairing process of the heavy-fermion superconductor CeCoIn5},
author = {Shrestha, K. and Zhang, S. and Greene, L. H. and Lai, Y. and Baumbach, R. E. and Sasmal, K. and Maple, M. B. and Park, W. K.},
abstractNote = {The microscopic mechanism for electron pairing in heavy-fermion superconductors remains a major challenge in quantum materials. Some form of magnetic mediation is widely accepted with spin fluctuations as a prime candidate. A novel mechanism, “composite pairing” based on the cooperative two-channel Kondo effect directly involving the f-electron moments, has also been proposed for some heavy-fermion compounds including CeCoIn5. The origin of the spin-resonance peak observed in neutron-scattering measurements on CeCoIn5 is still controversial and the corresponding hump-dip structure in the tunneling conductance is missing. This is in contrast to the cuprate and Fe-based high-temperature superconductors, where both characteristic signatures are observed, indicating spin fluctuations are likely involved in the pairing process. In this study, we report results from planar tunneling spectroscopy along three major crystallographic orientations of CeCoIn5 over wide ranges of temperature and magnetic field. The pairing gap opens at Tp~5K, well above the bulk Tc=2.3K, and its directional dependence is consistent with dx2–y2 symmetry. With increasing magnetic field, this pairing gap is suppressed as expected but, intriguingly, a gaplike structure emerges smoothly, increasing linearly up to the highest field applied. This field-induced gaplike feature is only observed below Tp. The concomitant appearance of the pairing gap and the field-induced gaplike feature, along with its linear increase with field, indicates that the f-electron local moments are directly involved in the pairing process in CeCoIn5.},
doi = {10.1103/physrevb.103.224515},
journal = {Physical Review. B},
number = 22,
volume = 103,
place = {United States},
year = {Thu Jun 10 00:00:00 EDT 2021},
month = {Thu Jun 10 00:00:00 EDT 2021}
}
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