Hybridization and superconducting gaps in heavy-fermion superconductor PuCoGa5 probed via the dynamics of photoinduced quasiparticles

Abstract

We have examined the relaxation of photoinduced quasiparticles in the heavy-fermion superconductor PuCoGa5. The deduced electron-phonon coupling constant is incompatible with the measured superconducting transition temperature Tc=18.5 K, which speaks against phonon-mediated superconducting pairing. Upon lowering the temperature, we observe an order-of-magnitude increase of the quasiparticle relaxation time in agreement with the phonon bottleneck scenario - evidence for the presence of a hybridization gap in the electronic density of states. The modification of photoinduced reflectance in the superconducting state is consistent with the heavy character of the quasiparticles that participate in Cooper pairing.

References in corpus (1)

• Coupling Between An Optical Phonon and the Kondo Effect

Cited by in corpus (6)

• Laser pulse driven control of charge and spin order in the two-dimensional Kondo lattice
• Spin-dependent polaron formation dynamics in Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$ probed by femtosecond pump-probe spectroscopy
• Anisotropic spin fluctuations and superconductivity in "115'' heavy fermion compounds: 59Co NMR study in PuCoGa5
• Ultrafast spectroscopy of quasiparticle dynamics in cuprate superconductors
• Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point
• Quasiparticle Relaxation Dynamics in URu${}_{2-x}$Fe${}_x$Si${}_2$ Single Crystals