Fluctuations and critical temperature reduction in cuprate superconductors

Tallon, J. L.; Storey, J. G.; Loram, J. W.

doi:10.1103/physrevb.83.092502

Cited by 66 publications

(93 citation statements)

References 29 publications

(42 reference statements)

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“…This may be due to the pre-pairing of superconductivity. Although the superconducting gap and pseudogap come from different origin, the electrons may have been paired above T c as indicated by the ARPES [47] and other experimental measurements [71][72][73]. Therefore, the back-bending phenomenon, and the region of intermediate doping is expected to be more pronounced due to strong superconducting gap magnitude.…”

Section: A the Quasiparticle Spectral Functionsmentioning

confidence: 99%

Phase competition and anomalous thermal evolution in high-temperature superconductors

Zhou

Yin

et al. 2017

Phys. Rev. B

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The interplay of competing orders is relevant to high-temperature superconductivity known to emerge upon suppression of a parent antiferromagnetic order typically via charge doping. How such interplay evolves at low temperature-in particular at what doping level the zero-temperature quantum critical point (QCP) is located-is still elusive because it is masked by the superconducting state. The QCP had long been believed to follow a smooth extrapolation of the characteristic temperature T * for the strange normal state well above the superconducting transition temperature. However, recently the T * within the superconducting dome was reported to unexpectedly exhibit back-bending likely in the cuprate Bi2Sr2CaCu2O 8+δ . Here we show that the original and revised phase diagrams can be understood in terms of weak and moderate competitions, respectively, between superconductivity and a pseudogap state such as d-density-wave or spin-density-wave, based on both Ginzburg-Landau theory and the realistic t-t ′ -t ′′ -J-V model for the cuprates. We further found that the calculated temperature and doping-level dependence of the quasiparticle spectral gap and Raman response qualitatively agrees with the experiments. In particular, the T * back-bending can provide a simple explanation of the observed anomalous two-step thermal evolution dominated by the superconducting gap and the pseudogap, respectively. Our results imply that the revised phase diagram is likely to take place in high-temperature superconductors.

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Section: A the Quasiparticle Spectral Functionsmentioning

confidence: 99%

Phase competition and anomalous thermal evolution in high-temperature superconductors

Zhou

Yin

et al. 2017

Phys. Rev. B

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“…Fig. 2(a) shows the previously reported analysis [6] th data point is shown. These may in turn be integrated to generate ∆F (T ) and ∆F mf (T ) and these combined with T ∆S(T ) and T ∆S mf (T ) to generate ∆(T ) and ∆ mf (T ) using Eq.…”

mentioning

confidence: 94%

“…This has allowed many important conclusions to be drawn [5], including the fact that, due to strong SC fluctuations, the mean-field (MF) transition temperature, T mf c , determined from entropy conservation, lies well above the observed T c value (by up to 50K) [6,7]. Hereafter, we drop the descriptor 'electronic' and by the terms specific heat, C P , specific heat coefficient, γ ≡ C P /T , entropy, S, internal energy, U , and free energy, F , we mean the electronic components of these.…”

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confidence: 99%

Coexistence of the superconducting energy gap and pseudogap above and below the transition temperature of cuprate superconductors

et al. 2013

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Coexistence of the superconducting energy gap and pseudogap above and below the transition temperature of superconducting cuprates We express the superconducting gap, ∆(T ), in terms of thermodynamic functions in both s-and d-wave symmetries. Applying to Bi2Sr2CaCu2O 8+δ and Y0.8Ca0.2Ba2Cu3O 7−δ we find that for all dopings ∆(T ) persists, as a partial gap, high above Tc due to strong superconducting fluctuations. Therefore in general two gaps are present above Tc, the superconducting gap and the pseudogap, effectively reconciling two highly polarized views concerning pseudogap physics.

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“…Indeed, several thermodynamical and transport studies report signatures of pairing above T c , which do not however persist up to T* 41,42,[44][45][46]48 . We find spectroscopic evidence of pair formation and were able to establish the value of the pairing temperature using our quantitative approach 49 .…”

Section: Pairing Above T Cmentioning

confidence: 99%

Pairing, pseudogap and Fermi arcs in cuprates

Kaminski

Kondo

Takeuchi

et al. 2014

Philosophical Magazine

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We use Angle Resolved Photoemission Spectroscopy (ARPES) to study the relationship between the pseudogap, pairing and Fermi arcs in cuprates. High quality data measured over a wide range of dopings reveals a consistent picture of Fermiology and pairing in these materials. The pseudogap is due to an ordered state that competes with superconductivity rather then preformed pairs.Pairing does occur below T pair ∼ 150K and significantly above Tc, but well below T* and the doping dependence of this temperature scale is distinct from that of the pseudogap. The d-wave gap is present below T pair , and its interplay with strong scattering creates "artificial" Fermi arcs for T c ≤ T ≤ T pair . However, above T pair , the pseudogap exists only at the antipodal region. This leads to presence of real, gapless Fermi arcs close to the node. The length of these arcs remains constant up to T*, where the full Fermi surface is recovered. We demonstrate that these findings resolve a number of seemingly contradictory scenarios.

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Fluctuations and critical temperature reduction in cuprate superconductors

Cited by 66 publications

References 29 publications

Phase competition and anomalous thermal evolution in high-temperature superconductors

Phase competition and anomalous thermal evolution in high-temperature superconductors

Coexistence of the superconducting energy gap and pseudogap above and below the transition temperature of cuprate superconductors

Pairing, pseudogap and Fermi arcs in cuprates

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