The pressure dependence of the transport properties of YBa2Cu3O7-δ

Parker, I. D.; Friend, Richard H.

doi:10.1088/0022-3719/21/11/002

Cited by 55 publications

(11 citation statements)

References 14 publications

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“…37. These models suggest two basic sources for the PE on T c : (i) A charge transfer from the charge reservoir to the superconducting CuO 2 plane, which was confirmed by Hall effect experiments, 30,31 and (ii) an increase of T c due to a pressure dependent pairing interaction.…”

Section: Introductionmentioning

confidence: 82%

“…26,27 Up to now, the PE on the superconducting transition temperature T c was studied by resistivity and Hall effect experiments. [28][29][30][31] Several phenomenological 28,32,33 and microscopic models were proposed based on a Hubbard 34,35 or a general BCS approach in order to explain the PE on T c . 36 The role of nonadiabatic effects is discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

et al. 2011

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The pressure dependence of the magnetic penetration depth in polycrystalline samples of YBa2Cu3Ox with different oxygen concentrations x=6. 45, 6.6, 6.8, and 6.98 was studied by muon spin rotation (SR). The pressure dependence of the superfluid density s1/2 as a function of the superconducting transition temperature Tc is found to deviate from the usual Uemura line. The ratio (Tc/P)/(s/P) is smaller by a factor of 2 than that of the Uemura relation. In underdoped samples, the zero-temperature superconducting gap Δ0 and the BCS ratio Δ0/kBTc both increase with increasing external hydrostatic pressure, implying an increase of the coupling strength with pressure. The relation between the pressure effect and the oxygen isotope effect on is also discussed. In order to analyze reliably the SR spectra of samples with strong magnetic moments in a pressure cell, a special model was developed and applied. The pressure dependence of the magnetic penetration depth λ in polycrystalline samples of YBa2Cu3Ox with different oxygen concentrations x = 6.45, 6.6, 6.8, and 6.98 was studied by muon spin rotation (µSR). The pressure dependence of the superfluid density ρs ∝ 1/λ 2 as a function of the superconducting transition temperature Tc is found to deviate from the usual Uemura line. The ratio (∂Tc/∂P )/(∂ρs/∂P ) is factor of ≃ 2 smaller than that of the Uemura relation. In underdoped samples, the zero temperature superconducting gap ∆0 and the BCS ratio ∆0/kBTc both increase with increasing external hydrostatic pressure, implying an increase of the coupling strength with pressure. The relation between the pressure effect and the oxygen isotope effect on λ is also discussed. In order to analyze reliably the µSR spectra of samples with strong magnetic moments in a pressure cell, a special model was developed and applied.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

et al. 2011

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“…[3][4][5] Unfortunately, earlier experimental works did not help in setting up a homogeneous picture of the problem, possibly due to an uncareful analysis of the data coming up from samples, often characterized by uneasily reproducible features, such as the hole content, when even a slight presence of impurities has been proved to influence dramatically the behaviour under pressure. 6 Nowadays there is a general conviction that pressure P may affect T c both changing the hole content ρ, which is evidenced by Hall resistance measurements, 7,8 and in an 'intrinsic' way, mainly due to a lattice rearrangement induced by pressure. Quantitatively, the latter statement can be summarized by assuming ρ = ρ(P ) and T c = T c (ρ, P ), which yields 9,10…”

Section: Introductionmentioning

confidence: 99%

Interplay among critical temperature, hole content, and pressure in the cuprate superconductors

1996

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Within a BCS-type mean-field approach to the extended Hubbard model, a nontrivial dependence of Tc on the hole content per unit CuO2 is recovered, in good agreement with the celebrated nonmonotonic universal behaviour at normal pressure. Evaluation of Tc at higher pressures is then made possible by the introduction of an explicit dependence of the tight-binding band and of the carrier concentration on pressure P . Comparison with the known experimental data for underdoped Bi2212 allows to single out an 'intrinsic' contribution to dTc/dP from that due to the carrier concentration, and provides a remarkable estimate of the dependence of the inter-site coupling strength on the lattice scale.

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“…Some authors have tried to relate the large change in T, under pressure to a change in the hole concentration [ l l , 14, 15,241. However, the observed weak dependence of Hall coefficients on pressure [38] excludes such an interpretation. The dependence of T, on t , has been studied in the frame of the BCS theory by taking the order parameter phase fluctuations into account [36].…”

Section: Conlcusionsmentioning

confidence: 92%

Effect of Forming Pressure on the Critical Temperature in YBa₂Cu₃O_7−δ Superconductors

Al-Shibani

Al-Aql

Al-Muezzin

et al. 1995

Physica Status Solidi (b)

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The effect of pressure on the critical temperature T, is studied for YBa,Cu,O,-, compounds prepared under various forming pressures. A systematic decrease in lattice parameters is observed with forming pressure. Resistivity measurements show an increase of the onset temperature T,, with forming pressure.A value of dT,,/dP = (0.070 0.010) x lo-' K/Pa is determined. A new mechanism based on the variation of the interlayer tunneling integral t , is used to analyse the experiment results. L'effet de la pression sur la temperature critique T, est etudiee pour le compose YBa,Cu,O,_, prepare sous une variett de pressions differentes. Une diminution systematique des parametres du rtseau sous l'influence de la pression a ett observke. Les mtsures de resistance montrent que la temperature regnante dans l'echantillon T,, augmente avec la pression. La valeur dT,,/dP 5 (0.070 0.010) x lo-' K/Pa et determinee. Le resultat experimental a ete analyse a l'aide d'un nouvel mecanisme base sur la variation de "tunneling" integral t , entre les couches.

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The pressure dependence of the transport properties of YBa₂Cu₃O_7-δ

Cited by 55 publications

References 14 publications

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

Interplay among critical temperature, hole content, and pressure in the cuprate superconductors

Effect of Forming Pressure on the Critical Temperature in YBa₂Cu₃O_7−δ Superconductors

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The pressure dependence of the transport properties of YBa2Cu3O7-δ

Cited by 55 publications

References 14 publications

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa2Cu3Ox

Interplay among critical temperature, hole content, and pressure in the cuprate superconductors

Effect of Forming Pressure on the Critical Temperature in YBa2Cu3O7−δ Superconductors

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Product

Resources

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The pressure dependence of the transport properties of YBa₂Cu₃O_7-δ

Effect of Forming Pressure on the Critical Temperature in YBa₂Cu₃O_7−δ Superconductors