2010/06/02 by Diyar Talbayev, D. Talbayev, Kenneth S. Burch +13 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Magnetic Properties of Alloys #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.104.227002
published as Physical Review Letters, vol 104, page 227002 (2010)
openalex publication_date 2010/06/02 · arxiv created 2010/06/21 · arxiv updated 2010/06/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 superconductivity. 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 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.