Diamagnetism and Cooper pairing above<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:mrow></mml:math>in cuprates

Li, Lu; Wang, Yayu; Komiya, Seiki; Ono, Shimpei; Ando, Yoichi; Gu, Genda; Ong, N. P.

doi:10.1103/physrevb.81.054510

Cited by 286 publications

(393 citation statements)

References 36 publications

Supporting

Mentioning

343

Contrasting

Order By: Relevance

“…This observation agrees with many other studies. 10,17,[40][41][42] 45) have shown that T * has not been observed in the extremely overdoped state near the edge of the superconducting "dome." The authors of that report argued that quantum critical fluctuations that destabilize the pseudogap are responsible for the high-T c superconductivity.…”

Section: Resultsmentioning

confidence: 99%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

View full text Add to dashboard Cite

To investigate the relationship between the pseudogap and superconductivity, we measured both the in-plane (ρ ab ) and out-of-plane (ρ c ) resistivity for oxygen-controlled Bi 2 Sr 2 CaCu 2 O 8+δ single crystals subject to magnetic fields (parallel to the c axis) of up to 17.5 T. The onset temperature for the superconductive fluctuation, T sc f , is determined by the large positive in-plane magnetoresistance (MR) and negative out-of-plane MR observed near T c , whereas the pseudogap opening temperature T * is determined by the semiconductive upturn of the zero-field ρ c . T sc f was found to scale roughly as T c , with a decreasing temperature interval between them upon doping. On the other hand, T * starts out much higher than T sc f but decreases monotonically upon doping; finally, at a heavily overdoped state, it is not observed above T sc f . These results imply that the pseudogap is not a simple precursor of superconductivity, but that further study is needed to determine whether or not T * exists below T sc f in the heavily overdoped state.

show abstract

Section: Resultsmentioning

confidence: 99%

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

et al. 2014

View full text Add to dashboard Cite

show abstract

“…In zero magnetic field, the net vorticity in the sample is zero, so the populations of "up" and "down" vortices are equal. In underdoped cuprates, there is strong evidence from Nernst 2 , magnetization [3][4][5] and other experiments in support of the phase-disordering scenario.…”

Section: Introductionmentioning

confidence: 86%

“…The recent torque magnetometry results in Ref. 5 have persuaded us that OPT YBCO is, in fact, much closer to the other hole-doped cuprates. The collapse of its Meissner state at T c is also caused by vanishing of phase rigidity.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Ong

2013

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…By definition, the lower and upper limits of this parameter are given by 0 and 1, respectively. It is visible at a first glance that the shape of the area in which according to our analysis pseudogap phenomena are strong, resembles the shape of the region on the phase diagram of cuprates in which the Nernst effect is strong [26][27][28]. …”

Section: Origin Of the Small Nodal Pseudogapmentioning

confidence: 99%

“…The presence of pseudogap has been established through the measurements of the nuclear magnetic resonance (NMR) [5], the scanning tunneling spectroscopy [6][7][8][9], the analysis of the electronic Raman scattering [10][11][12], through time-resolved optical spectroscopy [13][14][15][16][17][18], and through the ARPES [19][20][21][22][23][24][25]. The observed strong Nernst effect in cuprates has been also attributed to it [26][27][28]. Early measurements of the 89 Y nuclear magnetic resonance (Knight) shift in yttrium based cuprates demonstrated the existence of spin gap above T C [5].…”

Section: Introductionmentioning

confidence: 99%

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

et al. 2010

View full text Add to dashboard Cite

We argue that three gaps observed in underdoped cuprates can be attributed to the formation of antiferromagnetic spin polarons and bipolarons. Within the spin polaron scenario the antinodal pseudogap at he high energy scale originates from the change of the Fermi surface topology, induced by antiferromagnetic correlations. That change gives rise to the diminishing of the spectral weight at the antinodal region near the Brillouin zone boundary. We demonstrate that effect by analyzing effective models of doped antiferromagnets. The second type of pseudogap appearing at the intermediate energy scale originates from the phenomena which are precursory to superconductivity and predominantly concern the portion of the Fermi surface near the nodal region. In order to analyze the latter phenomenon we use the negative U Hubbard model, in which many details typical to spin polaron physics are neglected, but which contains the essential ingredient of it, that is the strong short range attraction. The lowest energy scale is related to the true superconducting gap which develops with doping, although both types of pseudogap diminish with doping. This behavior can be explained by the fact that the spin polaron band is empty in the undoped system and therefore the formation of the superconducting state in the system is forbidden. Due to a pedagogical character of this report, we present in the introduction a short overview of mostly recent experimental results which are related to the gap-pseudogap physics.

show abstract

Diamagnetism and Cooper pairing aboveTcin cuprates

Cited by 286 publications

References 36 publications

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

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

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

Contact Info

Product

Resources

About

Diamagnetism and Cooper pairing aboveTcin cuprates

Cited by 286 publications

References 36 publications

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi2Sr2CaCu2O8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

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

Spin Polaron-Bipolaron Scenario of Three Gap-Like Energy Scales in Superconducting Cuprates

Contact Info

Product

Resources

About

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements

Doping Dependencies of Onset Temperatures for the Pseudogap and Superconductive Fluctuation in Bi₂Sr₂CaCu₂O_8+δ, Studied from Both In-Plane and Out-of-Plane Magnetoresistance Measurements