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Mechanisms of nonthermal destruction of the superconducting state and melting of the charge-density-wave state by femtosecond laser pulses

Mechanisms of nonthermal destruction of the superconducting state and melting of the... The processes leading to nonthermal condensate vaporization and charge-density-wave (CDW) melting with femtosecond laser pulses is systematically investigated in different materials. We find that vaporization is relatively slow ( τ v ∼ 1 ps) and inefficient in superconductors, exhibiting a strong systematic dependence of the vaporization energy U v on T c . In contrast, melting of CDW order proceeds rapidly ( τ m = 50 –200 fs) and more efficiently. A quantitative model describing the observed systematic behavior in superconductors is proposed based on a phonon-mediated quasiparticle (QP) bottleneck mechanism. In contrast, Fermi-surface disruption by hot QPs is proposed to be responsible for CDW state melting. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Mechanisms of nonthermal destruction of the superconducting state and melting of the charge-density-wave state by femtosecond laser pulses

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2011 The American Physical Society
ISSN
1098-0121
eISSN
1550-235X
DOI
10.1103/PhysRevB.84.180507
Publisher site
See Article on Publisher Site

Abstract

The processes leading to nonthermal condensate vaporization and charge-density-wave (CDW) melting with femtosecond laser pulses is systematically investigated in different materials. We find that vaporization is relatively slow ( τ v ∼ 1 ps) and inefficient in superconductors, exhibiting a strong systematic dependence of the vaporization energy U v on T c . In contrast, melting of CDW order proceeds rapidly ( τ m = 50 –200 fs) and more efficiently. A quantitative model describing the observed systematic behavior in superconductors is proposed based on a phonon-mediated quasiparticle (QP) bottleneck mechanism. In contrast, Fermi-surface disruption by hot QPs is proposed to be responsible for CDW state melting.

Journal

Physical Review B – American Physical Society (APS)

Published: Nov 1, 2011

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