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Dubroka, Adam; Rössle, Matthias; Kim, Kyung Wan; Malik, V. K.; Munzar, Dominik; Basov, D. N.; Schafgans, A. A.; Moon, Seok‐Jun; Lin, C. T.; Haug, D.; Hinkov, V.; Keimer, B.; Wolf, Th.; Storey, J. G.; Tallon, J. L.; Bernhard, C.

doi:10.1103/physrevlett.106.047006

Cited by 142 publications

(183 citation statements)

References 35 publications

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“…Since the intra-bilayer phase coupling is much stronger, one might expect that the concomitant phase rigidity can be observed experimentally above T c . Recently, this was detected by Dubroka et al 16 as a Josephson plasma resonance that persists above T c over a broad doping range in YBCO (as high as 180 K in the underdoped regime).…”

Section: Discussionmentioning

confidence: 99%

Reply to “Comment on ‘Diamagnetism and Cooper pairing aboveTcin cuprates' ”

Wang

Ong

2013

Phys. Rev. B

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We analyze recent torque measurements of the magnetization M d vs. magnetic field H in optimally doped YBa2Cu3O7−y (OPT YBCO) to argue against a recent proposal by Rey et al. that the magnetization results above Tc are consistent with Gaussian fluctuations. We find that, despite its strong interlayer coupling, OPT YBCO displays an anomalous non-monotonic dependence of M d on H which represents direct evidence for the locking of the pair wavefunction phase θn at Tc and the subsequent unlocking by a relatively weak H. These unusual features characterize the unusual nature of the transition to the Meissner state in cuprate superconductors. They are absent in low-Tc superconductors to our knowledge. We also stress the importance of the vortex liquid state, as well as the profiles of the melting field Hm(T ) and the upper critical field curve Hc2(T ) in the T -H plane. Contrary to the claims of Rey et al., we show that the curves of the magnetization and the Nernst signal illustrate the inaccessibility of the Hc2 line near Tc. The prediction of the Hc2 line by Rey et al. is shown to be invalid in OPT YBCO.

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Section: Discussionmentioning

confidence: 99%

Reply to “Comment on ‘Diamagnetism and Cooper pairing aboveTcin cuprates' ”

Wang

Ong

2013

Phys. Rev. B

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“…Certain features of the pseudogap state suggest the presence of short-range superconducting order. For example, diamagnetic fluctuations are observed much above T c [17], and the spectral weight of the Drude conductivity between members of the bilayers in YBCO is found to increase below about 180 K, a trend consistent with fluctuating superconductivity and opposite to gap formation due to charge order [18]. On the other hand, the CDW is rather long ranged in the plane, but it does not resemble a conventional CDW driven by Fermi * palee@mit.edu…”

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confidence: 90%

Amperean Pairing and the Pseudogap Phase of Cuprate Superconductors

2014

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The enigmatic pseudogap phase in underdoped cuprate high-T c superconductors has long been recognized as a central puzzle of the T c problem. Recent data show that the pseudogap is likely a distinct phase, characterized by a medium range and quasistatic charge ordering. However, the origin of the ordering wave vector and the mechanism of the charge order is unknown. At the same time, earlier data show that precursive superconducting fluctuations are also associated with this phase. We propose that the pseudogap phase is a novel pairing state where electrons on the same side of the Fermi surface are paired, in strong contrast with conventional Bardeen-Cooper-Schrieffer theory which pairs electrons on opposite sides of the Fermi surface. In this state the Cooper pair carries a net momentum and belongs to a general class called pair density wave. The microscopic pairing mechanism comes from a gauge theory formulation of the resonating valence bond (RVB) picture, where spinons traveling in the same direction feel an attractive force in analogy with Ampere's effects in electromagnetism. We call this Amperean pairing.Charge order automatically appears as a subsidiary order parameter even when long-range pair order is destroyed by phase fluctuations. Our theory gives a prediction of the ordering wave vector which is in good agreement with experiment. Furthermore, the quasiparticle spectrum from our model explains many of the unusual features reported in photoemission experiments. The Fermi arc, the unusual way the tip of the arc terminates, and the relation of the spanning vector of the arc tips to the charge ordering wave vector also come out naturally. Finally, we propose an experiment that can directly test the notion of Amperean pairing. DOI: 10.1103/PhysRevX.4.031017 Subject Areas: Condensed Matter Physics, SuperconductivitySince the early days of cuprate superconductivity research, the pseudogap phase has been identified as a central piece of the high-T c puzzle [1]. The pseudogap opens below a temperature T Ã much above T c in underdoped cuprates, and it is visible in the spin susceptibility as detected by the Knight shift, in tunneling spectroscopy and in c-axis conductivity. Angle-resolved photoemission (ARPES) shows that the pseudogap opens in the antinodal region near ð0; πÞ (we set the lattice constant a to unity), leaving behind ungapped "Fermi arcs" centered around the nodes. Recent x-ray scattering data [2][3][4][5] reveal that the pseudogap is likely to be a distinct phase, characterized by the onset of a charge density wave (CDW) with wave vectors at ð0; AEδÞ and ðAEδ; 0Þ, where δ decreases with increasing doping, thus confirming evidence for charge order found earlier by scanning tunneling microscope (STM) [6][7][8][9] and nuclear magnetic resonance (NMR) experiments [10]. Recent advances include STM and x-ray studies on the same Bi 2 Sr 2 CaCu 2 O 8þx (Bi-2212) samples [11]. Other signatures include Kerr rotation [12], the emergence of anisotropy in the Nernst effect, etc. [13]. (Another set of exp...

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“…In contrast, the intense pulses combined with the low repetition rate used in this study are clearly superior for revealing the strong response in the pseudo-gap regime. While the origin of such PG phase in cuprates is still under active debate, [35][36][37] recently the incoherent pair formation has been identified in PG phase. 38 By virtue of the same observation, we conjecture that perhaps similar to the saturated response of the SC phase, the pulse energy in a highflux regime (> 10 0 Φ ) seems sufficient to break the majority of incoherent pairs in the PG phase .…”

Section: T Dt I T P T N T Dp T Dt I T P T N T T P T Pmentioning

confidence: 99%

Ultrafast pump-probe spectroscopic signatures of superconducting and pseudogap phases in YBa2Cu3O7−δ films

Zhang

Gray

et al. 2013

Journal of Applied Physics

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Femtosecond pump-probe spectroscopy is applied to identify transient optical signatures of phase transitions in optimally doped YBa 2 Cu 3 O 7-δ films. To elucidate the dynamics of superconducting and pseudogap phases, the slow thermal component is removed from the time-domain traces of photo-induced reflectivity in a high-flux regime with low frequency pulse rate. The rescaled data exhibit distinct signatures of the phase separation with abrupt changes at the onsets of T SC and T PG in excellent agreement with transport data. Compared to the superconducting phase, the response of the pseudogap phase is characterized by the strongly reduced reflectivity change accompanied by a faster recovery time.

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Evidence of a Precursor Superconducting Phase at Temperatures as High as 180 K inRBa2Cu3O7−δ (R=<

Cited by 142 publications

References 35 publications

Reply to “Comment on ‘Diamagnetism and Cooper pairing aboveTcin cuprates' ”

Reply to “Comment on ‘Diamagnetism and Cooper pairing aboveTcin cuprates' ”

Amperean Pairing and the Pseudogap Phase of Cuprate Superconductors

Ultrafast pump-probe spectroscopic signatures of superconducting and pseudogap phases in YBa2Cu3O7−δ films

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