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PreprintCC BY 4.0arXiv

Point-contact spectroscopy of electron-phonon interactions and anisotropy of superconducting energy gaps in 2H−NbSe2

  • N. L. Bobrov
  • L. V. Tiutrina
  • S. B. Feodos'ev
  • V. V. Fisun
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Abstract

The superconducting state of 2H−NbSe2 was studied using point contacts for two main orientations of the contact axis relative to the principal crystallographic orientations: along the c-axis and in the ab plane. For contacts oriented in the ab plane, dependencies proportional to the electron-phonon interaction function were obtained, which agree perfectly with the theoretical calculation. It was found that the features on the experimental curves associated with the electron-phonon interaction extend to energies twice the cutoff energy of the phonon spectrum and have an amplitude of the same order of magnitude throughout the entire energy range. It has been theoretically demonstrated that the features at energies exceeding the boundaries of the phonon density of states are caused by two-phonon scattering processes of non-equilibrium phonons on Andreev electrons. A criterion for the undisturbed nature of the crystal lattice in the region where gap features form has been found. Using 2H−NbSe2−Cu heterocontacts in the superconducting state, a study of energy gaps was conducted for two orientations of the NbSe2 crystal: along the c-axis and in the ab plane. It was found that the superconducting energy gaps are anisotropic; specifically, three gaps were identified in the ab plane, whereas only two were observed in the c direction.

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Cite

BibTeXRIS
BibTeX
@misc{bobrov2026pointcontact,
  title = {{Point-contact spectroscopy of electron-phonon interactions and anisotropy of superconducting energy gaps in $2H-NbSe_2$}},
  author = {N. L. Bobrov and L. V. Tiutrina and S. B. Feodos'ev and V. V. Fisun},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.37304},
  eprint = {2610.37304},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.37304},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Point-contact spectroscopy of electron-phonon interactions and anisotropy of superconducting energy gaps in 2H−NbSe_2
AU  - N. L. Bobrov
AU  - L. V. Tiutrina
AU  - S. B. Feodos'ev
AU  - V. V. Fisun
PY  - 2026
DA  - 2026/10/27
PB  - arXiv
DO  - 10.48550/arxiv.2610.37304
UR  - https://arxiv.org/abs/2610.37304
AB  - The superconducting state of 2H−NbSe_2 was studied using point contacts for two main orientations of the contact axis relative to the principal crystallographic orientations: along the c-axis and in the ab plane. For contacts oriented in the ab plane, dependencies proportional to the electron-phonon interaction function were obtained, which agree perfectly with the theoretical calculation. It was found that the features on the experimental curves associated with the electron-phonon interaction extend to energies twice the cutoff energy of the phonon spectrum and have an amplitude of the same order of magnitude throughout the entire energy range. It has been theoretically demonstrated that the features at energies exceeding the boundaries of the phonon density of states are caused by two-phonon scattering processes of non-equilibrium phonons on Andreev electrons. A criterion for the undisturbed nature of the crystal lattice in the region where gap features form has been found. Using 2H−NbSe_2−Cu heterocontacts in the superconducting state, a study of energy gaps was conducted for two orientations of the NbSe_2 crystal: along the c-axis and in the ab plane. It was found that the superconducting energy gaps are anisotropic; specifically, three gaps were identified in the ab plane, whereas only two were observed in the c direction.
ER  -