Observation of Competing Order in a High-$T_c$ Superconductor with Femtosecond Optical Pulses

Abstract

We present studies of the photoexcited quasiparticle dynamics in Tl${}_2$Ba${}_2$Ca${}_2$Cu${}_3$O${}_y$ (Tl-2223) using femtosecond optical techniques. Deep into the superconducting state (below 40 K), a dramatic change occurs in the temporal dynamics associated with photoexcited quasiparticles rejoining the condensate. This is suggestive of entry into a coexistence phase which, as our analysis reveals, opens a gap in the density of states (in addition to the superconducting gap), and furthermore, competes with superconductivity resulting in a depression of the superconducting gap.

5 pages, 3 figures

References in corpus (2)

• Uniform Mixing of High-Tc Superconductivity and Antiferromagnetism on a Single CuO2 Plane in Hg-based Five-layered Cuprate
• Quasiparticle Relaxation Across a Spin Gap in the Itinerant Antiferromagnet UNiGa5

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