Observation of Electron-Phonon Interaction with Soft Phonons in Superconducting <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">R</mi><mrow><msub><mrow><mi>Ni</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi>B</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mi>C</mi></math></span>

I. K. Yanson; V. V. Fisun; A. G. M. Jansen; P. Wyder; P. C. Canfield; B. K. Cho; C. V. Tomy; D. McK. Paul

doi:10.1103/PhysRevLett.78.935

Observation of Electron-Phonon Interaction with Soft Phonons in Superconducting $R {Ni}_{2} B_{2} C$

I. K. Yanson, V. V. Fisun, A. G. M. Jansen, P. Wyder, P. C. Canfield, B. K. Cho, C. V. Tomy, and D. McK. Paul

Phys. Rev. Lett. 78, 935 – Published 3 February 1997

Abstract

The point-contact (PC) spectra of the electron-phonon interaction (EPI) in the superconducting $R {Ni}_{2} B_{2} C$ ( $R = Ho, Y$ ) compounds reveal strong EPI with low-energy (4–9 meV) phonons, unlike the case of nonsuperconducting ${LaNi}_{2} B_{2} C$ . The PC-EPI spectral functions for all three compounds are determined and lower limits for the EPI interaction parameter $λ$ estimated. Besides, an unusual suppression of the PC-EPI spectral intensity by the external magnetic field was observed for the superconducting compounds, unlike the nonsuperconducting one.

Received 16 September 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.935

Authors & Affiliations

I. K. Yanson^1,2, V. V. Fisun^1,2, A. G. M. Jansen¹, P. Wyder¹, P. C. Canfield³, B. K. Cho³, C. V. Tomy⁴, and D. McK. Paul⁴

¹Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, B.P. 166, F-38042 Grenoble Cedex 9, France
²B.Verkin Institute for Low Temperature Physics and Engineering, Academy of Sciences of Ukraine, 310164 Kharkiv, Ukraine
³Ames Laboratory, Iowa State University, Ames, Iowa 50011
⁴Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom