139La NQR Relaxation in a Superconductor La3Ir2Ge2

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  • Kishimoto Yutaka
    Department of Physics, Faculty of Engineering, University of Tokushima
  • Kawasaki Yu
    Department of Physics, Faculty of Engineering, University of Tokushima
  • Ohno Takashi
    Department of Physics, Faculty of Engineering, University of Tokushima
  • Li Dexin
    Department of Physics, Faculty of Engineering, University of Tokushima
  • Homma Yoshiya
    Department of Physics, Faculty of Engineering, University of Tokushima
  • Shiokawa Yoshinobu
    Department of Physics, Faculty of Engineering, University of Tokushima

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  • <sup>139</sup>La NQR Relaxation in a Superconductor La<sub>3</sub>Ir<sub>2</sub>Ge<sub>2</sub>

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To investigate the electronic state of La3Ir2Ge2, 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 small coherence peak just below the superconducting transition temperature Tc=4.7 K and decreases exponentially well below Tc. La3Ir2Ge2 is found to be a BCS superconductor with an energy gap 2Δ(0)=3.52kBTc.

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