Dynamics of Non-superconducting Pairs in YBa2Cu3O7-δ Below Tc

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1. Very close Cited by this paper Not relevant

   Low-energy gap emerging from confined nematic states in extremely underdoped cuprate superconductors

   Hua-Zhou Li, Han Li, Zhao-Hui Wang et al. · 2022 · npj Quantum Materials · cited 21 times · Not summarized yet

   Abstract

   The pairing mechanism of high-temperature superconductivity in cuprates is regarded as one of the most challenging issues in condensed matter physics. The core issue concerns how the Cooper pairs are formed. Here we report spin-resolved tunneling measurements on extremely underdoped Bi_2Sr_2− x La_ x CuO_6+δ. Our data reveal that, when holes are doped into the system, the antiferromagnetic order is destroyed, while at the same time an increasing density of states (DOS) peaked at around 200 meV appears within the charge transfer gap. Meanwhile, an electronic structure with 4 a _0 × 4 a _0 basic plaquettes emerges inhomogeneously, with an area fraction that grows with hole doping. In each plaq…

2. Very close* Cited by this paper Not relevant

   Nonequilibrium superconductivity and quasiparticle dynamics in YBa 2 Cu 3 O 7-δ

   J. L. W. Siders, R. Jacobs, C. Siders et al. · 1998 · cited 39 times · Not summarized yet
3. Very close Cited by this paper Not relevant

   Quasiparticle relaxation dynamics in superconductors with different gap structures: theory and experiments on YBa_{2}Cu_{3}O_{7-δ}

   V. Kabanov, J. Demšar, B. Podobnik et al. · 1998 · Physical Review B · cited 213 times · Not summarized yet

   Abstract

   Photoexcited quasiparticle relaxation dynamics are investigated in a $YBa_{2}Cu_{3}O_{7-\delta}$ superconductor as a function of doping $\delta$ and temperature $T$ using ultrafast time-resolved optical spectroscopy. A model calculation is presented which describes the temperature dependence of the photoinduced quasiparticle population $n_{pe}$, photoinduced transmission $\Delta{\cal T}/{\cal T}$ and relaxation time $\tau $ for three different superconducting gaps: (i) a temperature-dependent collective gap such that ${\bf \Delta}(T)\to 0$ as $T\to T_{c}$, (ii) a temperature-independent gap, which might arise for the case of a superconductor with pre-formed pairs and (iii) an anisotropic (e.…

4. Very close Cited by this paper Not relevant

   The emergence of global phase coherence from local pairing in underdoped cuprates

   S. Ye, Chang-Wei Zou, Hong-Tao Yan et al. · 2023 · Nature Physics · cited 39 times · Not summarized yet

   Abstract

   In conventional metallic superconductors such as aluminium, the large number of weakly bounded Cooper pairs become phase-coherent as soon as they start to form. The cuprate high-temperature superconductors belong to a different category because, being doped Mott insulators, they are known to have low superfluid density and are therefore susceptible to phase fluctuations. It has been proposed that pairing and phase coherence may occur separately in cuprates, and that the measured critical temperature corresponds to the phase-coherence temperature controlled by the superfluid density. Here we examine the evolution of pairing and phase-ordering in underdoped cuprates, and find that a chequerboa…

5. Very close Cited by this paper Not relevant

   Characterization of photoinduced normal state through charge density wave in superconducting YBa2Cu3O6.67

   H. Jang, Sanghoon Song, T. Kihara et al. · 2022 · Science Advances · cited 25 times · Not summarized yet

   Abstract

   The normal state of high-Tc cuprates has been considered one of the essential topics in high-temperature superconductivity research. However, compared to the high magnetic field study of it, understanding a photoinduced normal state remains elusive. Here, we explore a photoinduced normal state of YBa2Cu3O6.67 through a charge density wave (CDW) with time-resolved resonant soft x-ray scattering, as well as a high magnetic field x-ray scattering. In the nonequilibrium state where people predict a quenched superconducting state based on the previous optical spectroscopies, we experimentally observed a similar analogy to the competition between superconductivity and CDW shown in the equilibrium …

6. Very close Cited by this paper Not relevant

   Ultrafast dynamics of fluctuations in high-temperature superconductors far from equilibrium.

   L. Perfetti, Bruno Sciolla, Giulio Biroli et al. · 2014 · Physical Review Letters · cited 17 times · Not summarized yet

   Abstract

   Despite extensive work on high-temperature superconductors, the critical behavior of an incipient condensate has so far been studied exclusively under equilibrium conditions. Here, we excite Bi(2)Sr(2)CaCu(2)O(8+δ) with a femtosecond laser pulse and monitor the subsequent nonequilibrium dynamics of the midinfrared conductivity. Our data allow us to discriminate temperature regimes where superconductivity is either coherent, fluctuating or vanishingly small. Above the transition temperature T(c), we make the striking observation that the relaxation to equilibrium exhibits power-law dynamics and scaling behavior, both for optimally and underdoped superconductors. Our findings can in part be mo…

7. Very close Cited by this paper Not relevant

   Dynamical decoherence of the light induced interlayer coupling in YBa2Cu3O6+δ

   C. R. Hunt, D. Nicoletti, S. Kaiser et al. · 2016 · Physical Review B · cited 25 times · Not summarized yet

   Abstract

   Optical excitation of apical oxygen vibrations in YBa$_{2}$Cu$_{3}$O$_{6+\delta}$ has been shown to enhance its c-axis superconducting-phase rigidity, as evidenced by a transient blue shift of the equilibrium inter-bilayer Josephson plasma resonance. Surprisingly, a transient c-axis plasma mode could also be induced above T$_{c}$ by the same apical oxygen excitation, suggesting light activated superfluid tunneling throughout the pseudogap phase of YBa$_{2}$Cu$_{3}$O$_{6+\delta}$. However, despite the similarities between the above T$_{c}$ transient plasma mode and the equilibrium Josephson plasmon, alternative explanations involving high mobility quasiparticle transport should be considered.…

8. Very close Cited by this paper Not relevant

   Photoinduced Nonequilibrium Response in Underdoped YBa2Cu3O6+x Probed by Time-Resolved Terahertz Spectroscopy

   S.-J. Zhang, Z.-X. Wang, H. Xiang et al. · 2019 · Physical Review X · cited 29 times · Not summarized yet

   Abstract

   Intense laser pulses have recently emerged as a tool to tune between different orders in complex quantum materials. Among different light-induced phenomena, transient superconductivity far above the equilibrium transition temperature in cuprates is particularly attractive. Key to those experiments was the resonant pumping of specific phonon modes, which was believed to induce superconducting phase coherence by suppressing the competing orders or modifying the structure slightly. Here, we present a comprehensive study of photo-induced nonequilibrium response in underdoped YBa$_2$Cu$_3$O$_{6+x}$. We find that upon photo-excitations, Josephson plasma edge in superconducting state is initially r…

Prior work it builds on

1. Close Used in depth by this paper Not relevant

   Atomic-scale electronic structure of the cuprate pair density wave state coexisting with superconductivity

   Peayush Choubey, S. Joo, K. Fujita et al. · 2020 · Proceedings of the National Academy of Sciences of the United States of America · cited 40 times · Not summarized yet

   Abstract

   Significance By making a variety of quantitative comparisons between electronic visualization experiments and a theory describing coexisting pair density wave and superconductive states in cuprates, we find striking correspondence throughout. Our model can thus explain the microscopic origins of many key atomic-scale phenomena of the cuprate broken-symmetry state. These observations are consistent with the possibility that a short-range pair density wave (PDW) state coexists with superconductivity below a critical hole density in Bi2Sr2CaCu2O8, that the charge density wave modulations in cuprates are a consequence of the PDW state, that the cuprate pseudogap is the antinodal gap of the PDW, …

2. Close Not relevant

   Imaging the energy gap modulations of the cuprate pair-density-wave state

   Zeng-Yi Du, Hui Li, S. Joo et al. · 2020 · Nature · cited 138 times · Not summarized yet

   Abstract

   The defining characteristic1,2 of Cooper pairs with finite centre-of-mass momentum is a spatially modulating superconducting energy gap Δ(r), where r is a position. Recently, this concept has been generalized to the pair-density-wave (PDW) state predicted to exist in copper oxides (cuprates)3,4. Although the signature of a cuprate PDW has been detected in Cooper-pair tunnelling5, the distinctive signature in single-electron tunnelling of a periodic Δ(r) modulation has not been observed. Here, using a spectroscopic technique based on scanning tunnelling microscopy, we find strong Δ(r) modulations in the canonical cuprate Bi2Sr2CaCu2O8+δ that have eight-unit-cell periodicity or wavevectors Q ≈…

3. Close Not relevant

   Visualization of the periodic modulation of Cooper pairing in a cuprate superconductor

   W. Ruan, Xin-Tong Li, Cheng Hu et al. · 2018 · Nature Physics · cited 100 times · Not summarized yet

   Abstract

   In cuprate superconductors, the existence of various intertwined orders associated with spin, charge and Cooper pairs1,2 is an obstacle in understanding the mechanism of Cooper pairing. The ubiquitous charge order is particularly important2–7. Various theories have been proposed to explain the origin of the charge order and its implications for the superconducting phase, including charge stripes8, electronic nematicity8,9 and Fermi surface instability5,10. A highly appealing physical picture is the ‘pair density wave’, a spatially periodic modulation of Cooper pairing, which may also induce a charge order2,11–21. To elucidate the existence and nature of the pair density wave, we use scanning…

4. Close Not relevant

   Direct observation of the coexistence of the pseudogap and superconducting quasiparticles in Bi2Sr2CaCu2O8 + y by time-resolved optical spectroscopy.

   Y.-H. Liu, Y. Toda, K. Shimatake et al. · 2008 · Physical Review Letters · cited 52 times · Not summarized yet

   Abstract

   We report the ultrafast optical response of quasiparticles (QPs) in both the pseudogap (PG) and superconducting (SC) states of an underdoped Bi2Sr2CaCu2O8 + y (Bi2212) single crystal measured with the time-resolved pump-probe technique. At a probe energy variant planck's over omegapr = 1.55 eV, it is found that the reflectivity change DeltaR/R changes its sign at exactly Tc, which allows the direct separation of the charge dynamics of PG and SC QPs. Further systematic investigations indicate that the transient signals associated with PG and SC QPs depend on the probe beam energy and polarization. By tuning them below Tc, two distinct components can be detected simultaneously, providing evide…

5. Close* Not relevant

   Dynamic conductivity and coherence peak in YBa2Cu3O7 superconductors.

   M. Nuss, P. M. Mankiewich, M. O'Malley et al. · 1991 · Physical Review Letters · cited 173 times · Not summarized yet