La-NQR probe of strong-coupling s-wave superconductivity in LaRu3Si2

To investigate the electronic state of LaRu3Si2, we have carried out 139La-NQR measurement. In the normal state, the spin-lattice relaxation rate 1/T1 is proportional to the temperature T. 1/T1 shows a coherence peak just below the superconducting transition temperature Tc=6.5 K and decreases expone...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2004, Vol.73 (1), p.190-193
Main Authors: KISHIMOTO, Yutaka, KAWASAKI, Yu, OHNO, Takashi, GUPTA, Laxmi C, GHOSH, Goutam
Format: Article
Language:English
Subjects:
Bcs theory and its development
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Nuclear magnetic resonance and relaxation
Physics
Superconductivity
Theory and models of superconducting state
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Summary:To investigate the electronic state of LaRu3Si2, we have carried out 139La-NQR measurement. In the normal state, the spin-lattice relaxation rate 1/T1 is proportional to the temperature T. 1/T1 shows a coherence peak just below the superconducting transition temperature Tc=6.5 K and decreases exponentially well below Tc. LaRu3Si2 is found to be a strong coupling BCS superconductor with a large energy gap 2δ(0)=5.50kBTc. A relatively high Tc in LaRu3Si2 is presumably due to a high density of states of conduction electrons at Fermi surface and strong electron-phonon interaction.
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.73.190