Quasiparticle Relaxation Across a Spin Gap in the Itinerant Antiferromagnet UNiGa5

Abstract

Ultrafast time-resolved photoinduced reflectivity is measured for the itinerant antiferromagnet UNiGa${}_5$ ($T_N\approx$85 K) from room temperature to 10 K. The relaxation time $\tau$ shows a sharp increase at $T_N$ consistent with the opening of a spin gap. In addition, the temperature dependence of $\tau$ below $T_N$ is consistent with the opening of a spin gap leading to a quasiparticle recombination bottleneck as revealed by the Rothwarf-Taylor model. This contrasts with canonical heavy fermions such as CeCoIn${}_5$ where the recombination bottleneck arises from the hybridization gap.

arXiv comment5 pages, 5 figures

References in corpus (11)

• A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?
• Quasiparticle relaxation dynamics in superconductors with different gap structures: theory and experiments on YBa_{2}Cu_{3}O_{7-δ}
• Single particle and collective excitations in the one-dimensional charge density wave solid K0.3MoO3 probed in real time by femtosecond spectroscopy
• Kinetics of a superconductor excited with a femtosecond optical pulse
• Pair-breaking and superconducting state recovery dynamics in MgB2
• Superconductivity and Magnetism in a New Class of Heavy-Fermion Materials
• Quasiparticle relaxation dynamics in heavy fermion compounds
• Quasiparticle dynamics and gap structure in Hg1223 investigated with femtosecond spectroscopy
• Photoexcited electron dynamics in Kondo insulators and heavy fermions
• Ultrafast quasiparticle relaxation dynamics in normal metals and heavy fermion materials
• Evidence for crossover from a Bose-Einstein condensate to a BCS-like superconductor with doping in YBa2Cu3O(7-x) from quasiparticle relaxation dynamics experiments

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