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PreprintCC BY 4.0arXiv

Strain-Tunable High-Tc Superconductivity in Layered R3m B2CN

  • Durjay Dhali
  • Arafat Rahman
  • Tareq Mahmud
  • Alamgir Kabir
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Abstract

Using DFPT and Wannier-interpolated matrix elements in EPW, we find that isotropic tensile strain of 0--6\% narrows the B:2p/C:2p bands at the Fermi level while softening the phonon branches most strongly coupled to them, driving the coupling constant λ from 0.967 to 2.620. All four strained configurations remain mechanically and dynamically stable, satisfying the Born--Huang criteria with no imaginary phonon modes at any strain level. The fully anisotropic Migdal--Eliashberg equations give a Tc that rises monotonically from 53.5~K to 84.5~K across the strain series, crossing the liquid-nitrogen boiling point at 6\% strain. The SISSO-based machine-learning model in EPW agrees with the anisotropic Migdal--Eliashberg Tc values to within 10~K across the strain series.

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Cite

BibTeXRIS
BibTeX
@misc{dhali2026straintunable,
  title = {{Strain-Tunable High-$T_c$ Superconductivity in Layered R3m B$_2$CN}},
  author = {Durjay Dhali and Arafat Rahman and Tareq Mahmud and Alamgir Kabir},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.24799},
  eprint = {2610.24799},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.24799},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Strain-Tunable High-T_c Superconductivity in Layered R3m B_2CN
AU  - Durjay Dhali
AU  - Arafat Rahman
AU  - Tareq Mahmud
AU  - Alamgir Kabir
PY  - 2026
DA  - 2026/10/17
PB  - arXiv
DO  - 10.48550/arxiv.2610.24799
UR  - https://arxiv.org/abs/2610.24799
AB  - Using DFPT and Wannier-interpolated matrix elements in EPW, we find that isotropic tensile strain of 0--6\% narrows the B:2p/C:2p bands at the Fermi level while softening the phonon branches most strongly coupled to them, driving the coupling constant λ from 0.967 to 2.620. All four strained configurations remain mechanically and dynamically stable, satisfying the Born--Huang criteria with no imaginary phonon modes at any strain level. The fully anisotropic Migdal--Eliashberg equations give a T_c that rises monotonically from 53.5~K to 84.5~K across the strain series, crossing the liquid-nitrogen boiling point at 6\% strain. The SISSO-based machine-learning model in EPW agrees with the anisotropic Migdal--Eliashberg T_c values to within 10~K across the strain series.
ER  -