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

Rey, R. I.; Ramos-Álvarez, A.; Mosqueira, J.; Ramallo, M. V.; Vidal, F.

doi:10.1103/physrevb.87.056501

Cited by 17 publications

(33 citation statements)

References 56 publications

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“…IV we discuss the fits to the magnetization above T c . We show that the conclusions of Rey et al 7 are not valid.…”

Section: Introductionmentioning

confidence: 37%

“…Significantly, at low H, the linearresponse segment of χ suddenly becomes strongly Hdependent even in very weak H. As we discussed, this reflects the non-monotonicity that appears above the field H cusp . These features cannot be described by the Gaussian approach of Rey et al 7 .…”

Section: Hmentioning

confidence: 99%

“…7 , the H c2 line is predicted to increase linearly with t from the point (T = T c , H = 0) with a slope of -3 T/K. We have drawn their H c2 line as a dashed line (labelled as Hc2?)…”

Section: Closure Of the Hc2 Curvementioning

confidence: 99%

“…For the LD parameter, we used the value proposed by Rey et al 7 (B LD = 0.11). While the fit can account for the overall magnitude of χ above 100 K with reasonable parameters, as shown by Rey et al, the functional form in Eq.…”

Section: Hmentioning

confidence: 99%

“…In a Comment, Rey et al 7 have fitted the magnetization curves for OPT YBCO in Ref. 5 to their model and claimed that the diamagnetic signal is consistent with MF Gaussian fluctuations in a layered superconductor.…”

Section: Introductionmentioning

confidence: 99%

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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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“…IV we discuss the fits to the magnetization above T c . We show that the conclusions of Rey et al 7 are not valid.…”

Section: Introductionmentioning

confidence: 37%

Section: Hmentioning

confidence: 99%

“…7 , the H c2 line is predicted to increase linearly with t from the point (T = T c , H = 0) with a slope of -3 T/K. We have drawn their H c2 line as a dashed line (labelled as Hc2?)…”

Section: Closure Of the Hc2 Curvementioning

confidence: 99%

Section: Hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

Ong

2013

Phys. Rev. B

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Dimensional crossovers in the Gaussian critical fluctuations above Tc of two-layer and three-layer superconductors

et al. 2022

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By using a Ginzburg–Landau functional in the Gaussian approximation, we calculate the energy of superconducting fluctuations above the transition, at zero external magnetic field, of a system composed by a small number N of parallel two-dimensional superconducting planes, each of them Josephson coupled to its first neighbour, with special focus in the N = 2 and 3 cases. This allows us to obtain expressions for the critical contributions to various observables (fluctuation specific heat and magnetic susceptibility and Aslamazov–Larkin paraconductivity). Our results suggest that these systems may display deviations from pure 2D behaviour and interesting crossover effects, with both similitudes and differences to those known to occur in infinite-layers superconductors. Some challenges for future related research are also outlined.

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