Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-05
Phys. Rev. Lett. 101, 227001 (2008)
Physics
Condensed Matter
Superconductivity
5 pages of article plus 4 pages of supplementary material
Scientific paper
10.1103/PhysRevLett.101.227001
We use ultrashort intense laser pulses to study superconducting state vaporization dynamics in La(2-x)Sr(x)CuO4 (x=0.1 and 0.15) on the femtosecond timescale. We find that the energy density required to vaporize the superconducting state is 2+- 0.8 K/Cu and 2.6 +- 1 K/Cu for x=0.1 and 0.15 respectively. This is significantly greater than the condensation energy density, indicating that the quasiparticles share a large amount of energy with the boson glue bath on this timescale. Considering in detail both spin and lattice energy relaxation pathways which take place on the relevant timescale of picoseconds, we rule out purely spin-mediated pair-breaking in favor of phonon-mediated mechanisms, effectively ruling out spin-mediated pairing in cuprates as a consequence.
Demsar Jure
Kabanov Vladimir V.
Kusar P.
Mertelj T.
Mihailovic Dragan
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