The condensation energy and pseudogap energy scale of Bi:2212 from the electronic specific heat

Loram, J. W.; Luo, J. L.; Cooper, J. R.; Liang, W. Y.; Tallon, J. L.

doi:10.1016/s0921-4534(00)00706-1

Cited by 96 publications

(91 citation statements)

References 12 publications

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“…33 As previously suggested by Kusar et al, 6 the discrepancy between U p and U c indicates an efficient fast dissipation of the photoexcitation energy by phonons. 6 Let us now consider the F dependencies of the decay times [insets of Figs.…”

Section: Physical Review B 84 174516 (2011)mentioning

confidence: 62%

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O
Toda
¹
,
Mertelj
²
,
Kusar
³

et al. 2011
Phys. Rev. B

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We investigate the relaxation dynamics of photoexcited quasiparticles (QPs) in underdoped Bi 2 Sr 2 CaCu 2 O 8+δ (T c = 78 K). By changing the excitation energy and polarization of the probe beam, two different types of relaxation dynamics, associated with superconducting (SC) and pseudogap (PG) QPs, are quantitatively analyzed independently. From the temperature dependencies, we obtained the SC gap, SC (0) = 24 meV, using BCStype temperature-dependent gap and the pseudogap, PG = 41 meV. The pump fluence (F) dependence of the SC-dominated transients shows a contribution of the PG component above the saturation condition of the SC component (F th = 16 μJ/cm 2 ), where Cooper pairs with long-range order are fully destroyed within the photoexcited volume. Assuming a temperature-independent PG decay time, we successfully isolate the native SC transient even above F th by subtracting the PG response from the original data. In the saturation regime, the exponential decay (recovery of SC) is fast (τ SC ∼ 2-3 ps), suggesting an efficient nonequilibrium phonon relaxation in this compound. We also find a flat-top response preceding the exponential decay at F > F th , which appears as a delay of SC recovery in the original data. This response is visible over the whole temperature range below T c and its duration increases with increasing F. The response is attributable to a photoinduced SC to non-SC phase transition arising from excitation by the nonthermal QPs and/or high-frequency phonons. The consistently near-constant magnitude of the PG response at the start of the SC state recovery from the non-SC phase suggests a correlation between the SC and PG QPs.

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Section: Physical Review B 84 174516 (2011)mentioning

confidence: 62%

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O
Toda
¹
,
Mertelj
²
,
Kusar
³

et al. 2011
Phys. Rev. B

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“…Measurements on the electronic specific heat by Loram et al (Loram et al, 2000) show that the normal state pseudo gap opens abruptly in the underdoped region below a hole doping equal to p crit ∼ 0.19 holes/CuO 2 . Inspired by these data, we will assume that around the pseudogap region, states are partly depleted and the density of states is linear, that is N 0 (ω) = N 0 |ω|/∆ P G for |ω| ≤ ∆ P G and N 0 (ω) = N 0 for ∆ P G < |ω| < W/2 with W the bandwidth.…”

Section: Single Impurity Bound State In a Pseudogap State Of Twmentioning

confidence: 99%

Impurity-induced states in conventional and unconventional superconductors

2006

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We review recent developments in our understanding of how impurities influence the electronic states in the bulk of superconductors. Our focus is on the quasi-localized states in the vicinity of impurity sites in conventional and unconventional superconductors and our goal is to provide a unified framework for their description. The non-magnetic impurity resonances in unconventional superconductors are directly related to the Yu-Shiba-Rusinov states around magnetic impurities in conventional s-wave systems. We review the physics behind these states, including quantum phase transition between screened and unscreened impurity, and emphasize recent work on d-wave superconductors. The bound states are most spectacularly seen in scanning tunneling spectroscopy measurements on high-Tc cuprates, which we describe in detail. We also discuss very recent progress on the states coupled to impurity sites which have their own dynamics, and impurity resonances in the presence of an order competing with superconductivity. Last part of the review is devoted to influence of local deviations of the impurity concentration from its average value on the density of states in s-wave superconductors. We review how these fluctuations affect the density of states and show that s-wave superconductors are, strictly speaking, gapless in the presence of an arbitrarily small concentration of magnetic impurities.

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“…None of this is expected for phonons which should be present at all temperatures and doping levels. The disappearance of the resonance mode may be related to the possible vanishing of the pseudogap and the existence of a quantum critical point [25,26]. Recent data [27] suggests that the critical doping level for the disappearance of the pseudogap in c-axis transport may be higher than p = 0.22 at least in Bi-2212.…”

mentioning

confidence: 99%

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Hwang

Timusk

2004

Nature

221

293

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The condensation energy and pseudogap energy scale of Bi:2212 from the electronic specific heat

Cited by 96 publications

References 12 publications

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O
Toda
¹
,
Mertelj
²
,
Kusar
³

et al. 2011
Phys. Rev. B

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O
Toda
¹
,
Mertelj
²
,
Kusar
³

et al. 2011
Phys. Rev. B

Impurity-induced states in conventional and unconventional superconductors

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

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The condensation energy and pseudogap energy scale of Bi:2212 from the electronic specific heat

Cited by 96 publications

References 12 publications

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2OToda1, Mertelj2, Kusar3 et al. 2011Phys. Rev. B

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2OToda1, Mertelj2, Kusar3 et al. 2011Phys. Rev. B

Impurity-induced states in conventional and unconventional superconductors

High-transition-temperature superconductivity in the absence of the magnetic-resonance mode

Contact Info

Product

Resources

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Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O
Toda
¹
,
Mertelj
²
,
Kusar
³

et al. 2011
Phys. Rev. B

Quasiparticle relaxation dynamics in underdoped Bi2Sr2CaCu2O
Toda
¹
,
Mertelj
²
,
Kusar
³

et al. 2011
Phys. Rev. B