Possible Eliashberg-Type Superconductivity Enhancement Effects in a Two-Band Superconductor MgB2 Driven by Narrow-Band THz Pulses
Sergei Sobolev, Amon P. Lanz, Tao Dong, Amrit Pokharel, Viktor Kabanov, Tie-Quan Xu, Yue Wang, Zi-Zhao Gan, Li-Yu Shi, Nan-Lin Wang, Alexej Pashkin, Ece Uykur, Stephan Winnerl, Manfred Helm, Jure Demsar
DOI 10.1103/PhysRevLett.131.186903 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We study THz-driven condensate dynamics in epitaxial thin films of MgB2, a prototype two-band superconductor (SC) with weak interband coupling. The temperature and excitation density dependent dynamics follow the behavior predicted by the phenomenological bottleneck model for the single-gap SC, implying adiabatic coupling between the two condensates on the ps timescale. The amplitude of the THz-driven suppression of condensate density reveals an unexpected decrease in pair-breaking efficiency with increasing temperature—unlike in the case of optical excitation. The reduced pair-breaking efficiency of narrow-band THz pulses, displaying minimum near ≈0.7 Tc, is attributed to THz-driven, long-lived, nonthermal quasiparticle distribution, resulting in Eliashberg-type enhancement of superconductivity, competing with pair breaking.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure unresolved | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36 | Pressure not reported | unknown |
Similar papers
Combining Eliashberg Theory with Density Functional Theory for the Accurate Prediction of Superconducting Transition Temperatures and Gap Functions
similarity 0.95A. Sanna et al.
Source status unknown — claims are unverified
High magnetic field superconductivity in a two-band superconductor
similarity 0.95Tancredi Salamone et al.
Source status unknown — claims are unverified
Amplitude Mode in a Multigap Superconductor MgB2 Investigated by Terahertz Two-Dimensional Coherent Spectroscopy
similarity 0.95Kota Katsumi et al.
Source status unknown — claims are unverified
Electron-phonon coupling and two-band superconductivity of Al- and C-doped MgB2
similarity 0.94O. De la Peña-Seaman et al.
Source status unknown — claims are unverified
Phonon self-energy effects in the superconducting energy gap of MgB2 point-contact spectra
similarity 0.94I. K. Yanson et al.
Source status unknown — claims are unverified
Superconducting transition temperature: Interacting Fermi gas and phonon mechanisms in the nonadiabatic regime
similarity 0.94Lev P. Gor'kov
Source status unknown — claims are unverified