Magnetic phase diagram of the layered superconductor Bi2+xSr2−xCuO6+δ(Bi2201) withTc≈ 7 K

Salem‐Sugui, S.; Alvarenga, A. D.; Mosqueira, J.; Dancausa, J. D.; Mejía, C. Salazar; Sinnecker, E. H. C. P.; Luo, Huiqian; Wen, Hao

doi:10.1088/0953-2048/25/10/105004

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…of the order of H c2 (0) [35]. This effect was observed experimentally in low-T c superconductors [104], and in a low-T c cuprate [120]. However, in our experiments the maximum field amplitude was 9T, much lower than the H 0 c 0 2 m ( ) value for OPT Y-123, and thus one might expect that ε c will remain field independent.…”

supporting

confidence: 44%

The conductivity and the magnetization around T _c in optimally-doped YBa₂Cu₃O_7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

Rey

Carballeira

Doval

et al. 2019

Supercond. Sci. Technol.

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We first present detailed measurements of the rounding behavior around the superconducting transition temperature, T c , of the in-plane electrical conductivity, magnetoconductivity and magnetization, including the low and moderate magnetic field regimes, in a high-quality single crystal and a thin film of the prototypical optimally-doped YBa 2 Cu 3 O 7-δ (OPT Y-123), in which the inhomogeneity effects are minimized. Then, we present a comparison of these experimental data with the phenomenological Ginzburg-Landau (GL) approach that takes into account the unavoidable contribution of the fluctuating pairs, the only theoretical scenario that at present allows analysis of these roundings at the quantitative level. These analyses demonstrate that the measured rounding effects around T c may be explained quantitatively and consistently in terms of the GL scenario, even up to the rounding onset temperatures if the quantum localization, associated with the shrinkage of the superconducting wave function, is taken into account. The implications of our results on the pseudogap physics of optimally-doped cuprates are also discussed.

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supporting

confidence: 44%

The conductivity and the magnetization around T _c in optimally-doped YBa₂Cu₃O_7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

Rey

Carballeira

Doval

et al. 2019

Supercond. Sci. Technol.

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show abstract

“…[41] This effect was observed experimentally in low-T c superconductors, [112] and in a low-T c cuprate. [128] However, in our experiments the maximum field amplitude was 9 T, much lower than the µ 0 H c2 (0) value for OPT Y-123, and thus one might expect that ε c will remain field independent.…”

Section: Onset Temperature Of the Superconducting Fluctuationscontrasting

confidence: 66%

The conductivity and the magnetization around Tc in optimally-doped YBa$_2$Cu$_3$O$_{7-δ}$ revisited: quantitative analysis in terms of fluctuating superconducting pairs

Rey,

Carballeira,

Doval

et al. 2019

Preprint

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We first present detailed measurements of the rounding behavior around the superconducting transition temperature, T c , of the in-plane electrical conductivity, magnetoconductivity and magnetization, including the low and moderate magnetic field regimes, in a high-quality single crystal and a thin film of the prototypical optimally-doped YBa 2 Cu 3 O 7−δ (OPT Y-123), in which the inhomogeneity effects are minimized. Then, it is presented a comparison of these experimental data with the phenomenological Ginzburg-Landau (GL) approach that takes into account the unavoidable contribution of the fluctuating pairs, the only theoretical scenario allowing at present to analyze these roundings at the quantitative level. These analyses demonstrate that the measured rounding effects around T c may be explained quantitative and consistently in terms of the GL scenario, even up to the rounding onset temperatures if the quantum localization, associated with the shrinkage of the superconducting wavefunction, is taken into account. The implications of our results on the pseudogap physics of optimally-doped cuprates are also discussed.

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“…2,3 This conclusion was later confirmed by measurements in other LTSC 15 and also in a HTSC with a low H c2 (0). 16 Measurements of the dc paraconductivity under relatively high magnetic fields in different HTSC also support H q ∼ H c2 (0). 13,14 The question now is, therefore, if the H c2 (0) values of the samples studied in Ref.…”

mentioning

confidence: 77%

Comment on 'Temperature range of superconducting fluctuations above $T_c$ in YBa$_2$Cu$_3$O$_{7-δ}$ single crystals'

Sóñora,

Mosqueira,

Vidal

2019

Preprint

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In the article by Grbić et al. (Phys. Rev. B 83, 144508 (2011)), measurements of microwave absorption were used to determine the in-plane ac-fluctuation conductivity (or paraconductivity) at zero-field of YBa2Cu3O 7−δ single crystals with different doping levels, and then to establish the temperature range of the superconducting fluctuations above Tc. The ac-paraconductivity was obtained as the difference between the measurements at zero magnetic field and at 16 T, the maximum field amplitude used in their experiments. However, we will argue that such field amplitude is not enough to quench all superconducting fluctuations in the studied compounds and that, therefore, the authors actually determine the ac-fluctuation magnetoconductivity at 16 T. So, the temperature they propose for the onset of the superconducting fluctuations, T ′ , will correspond to the one at which the finite field effects at 16 T become measurable in their experiments, and the actual temperature of the superconducting fluctuations onset will be located well above T ′ . These conclusions, which also concern influential recent publications on that issue, are then confirmed by analyzing some of the Grbić and coworkers data on the grounds of the Gaussian Ginzburg-Landau (GGL) approach for the finite-field (or Prange) fluctuation regime.The starting assumption of the Grbić and coworkers analysis of their interesting microwave absorption measurements in YBa 2 Cu 3 O 7−δ (YBCO) single crystals is that the field of 16 T is well sufficient to suppress all superconducting fluctuations above the zero field T c . 1 Accordingly, these authors claim to extract the real part of the in-plane ac paraconductivity in zero magnetic field, as the difference of the curves (of the conductivities) measured in zero field and in the field of 16 T. The temperature at which this difference becomes measurable with their experimental resolution, denoted T ′ , is then identified with the onset of the superconducting fluctuations. To further support their conclusions, Grbić and coworkers claim that the so-obtained zero field acparaconductivity may be quantitatively explained on the grounds of the GGL scenario.

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Magnetic phase diagram of the layered superconductor Bi_2+xSr_2−xCuO_6+δ(Bi2201) withT_c≈ 7 K

Cited by 7 publications

References 36 publications

The conductivity and the magnetization around T _c in optimally-doped YBa₂Cu₃O_7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

The conductivity and the magnetization around T _c in optimally-doped YBa₂Cu₃O_7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

The conductivity and the magnetization around Tc in optimally-doped YBa$_2$Cu$_3$O$_{7-δ}$ revisited: quantitative analysis in terms of fluctuating superconducting pairs

Comment on 'Temperature range of superconducting fluctuations above $T_c$ in YBa$_2$Cu$_3$O$_{7-δ}$ single crystals'

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Magnetic phase diagram of the layered superconductor Bi2+xSr2−xCuO6+δ(Bi2201) withTc≈ 7 K

Cited by 7 publications

References 36 publications

The conductivity and the magnetization around T c in optimally-doped YBa2Cu3O7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

The conductivity and the magnetization around T c in optimally-doped YBa2Cu3O7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

The conductivity and the magnetization around Tc in optimally-doped YBa$_2$Cu$_3$O$_{7-δ}$ revisited: quantitative analysis in terms of fluctuating superconducting pairs

Comment on 'Temperature range of superconducting fluctuations above $T_c$ in YBa$_2$Cu$_3$O$_{7-δ}$ single crystals'

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Magnetic phase diagram of the layered superconductor Bi_2+xSr_2−xCuO_6+δ(Bi2201) withT_c≈ 7 K

The conductivity and the magnetization around T _c in optimally-doped YBa₂Cu₃O_7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs

The conductivity and the magnetization around T _c in optimally-doped YBa₂Cu₃O_7-δ revisited: quantitative analysis in terms of fluctuating superconducting pairs