Identification of specific phonon contributions in BCS-type superconductivity of boride-carbide crystals with a layer-like structure
SOLID STATE COMMUNICATIONS, cilt.206, ss.1-5, 2015 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 206
- Basım Tarihi: 2015
- Doi Numarası: 10.1016/j.ssc.2015.01.010
- Dergi Adı: SOLID STATE COMMUNICATIONS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.1-5
- Gazi Üniversitesi Adresli: Evet
Özet
We report On an ab initio study of the BCS-type superconductivity in the intermetallic borocarbides YPd2B2C, YPt2B2C and LaPt2B2C with a layer-like structure. The largest contribution to the electron-phonon coupling constant lambda is identified to come from transverse acoustic phonons at a zone-edge, arking from the atomic vibrations in the boron-transition metal layer. A detailed examination of the atomic geometry in the boron-transition metal layer, the electron-phonon coupling constant lambda, and the logarithmically averaged phonon frequency omega(In), helps explain the relatively higher superconducting temperature T-c of YPd2B2C (20.6 K) compared to that of YPt2B2C (11.3 K) and LaPt2B2C (10.40 K). (C) 2015 Elsevier Ltd. All rights reserved.