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Cheong, S. W.; Brown, Sydney Park; Fisk, Z.; Kwok, R.S.; Thompson, J. D.; Zirngiebl, E.; Grüner, G.; Peterson, DE; Wells, G.L.; Schwarz, R. B.; Cooper, Andrea M.

doi:10.1103/physrevb.36.3913

Cited by 108 publications

(14 citation statements)

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“…3) of this ma- terial is large and positive, which m a single-band model implies that entropy transport is dominated by a small number of hole-hke carriers. The room temperature value of S is nearly 50 Umes larger than In RBa2Cu307 [6] and comparable to that found in oxygen-deficient samples of this material [ 10]. Unlike the nearly temperature independent thermopower of polycrystalline high-Tc compounds [ 6 ], we find Soc T 1/4 for 25 < T<220 K, roughly the same temperature interval over which in Roc T-i/4.…”

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confidence: 47%

“…The room temperature value of S is nearly 50 Umes larger than In RBa2Cu307 [6] and comparable to that found in oxygen-deficient samples of this material [ 10]. Unlike the nearly temperature independent thermopower of polycrystalline high-Tc compounds [ 6 ], we find Soc T 1/4 for 25 < T<220 K, roughly the same temperature interval over which in Roc T-i/4. For 3D variable-range hopping, S should be proportional to T 1/2 [ 7,12 ], clearly not the temperature dependence observed here.…”

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confidence: 47%

“…1 and by the square in the inset, which are in good agreement with the data and with the estimate obtained by X-ray analysis of the fractional amount of Y2Cu205 present. Assuming that Zo is due to a Pauhlike contribution from YBaLaCu3Ox implies that the effective density-of-states at the Fermi energy in YBaLaCu3Ox is about 1/4 that of the high-To superconductor YBa2Cu30~ [ 6 ].…”

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confidence: 99%

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Evidence for electronic localization in YBa2−yLayCu3Ox

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Evidence for electronic localization in YBa2−yLayCu3Ox

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“…The Hall coefficient, R H = σ xy /(Hσ xx σ yy ) (where σ xx and σ xy are the longitudinal and Hall components of the conductivity tensor) is approximately proportional to 1/T at high temperatures, 4 while the cotangent of the Hall angle, cot Θ H = σ xx /σ xy is described by the quadratic temperature dependence,…”

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confidence: 99%

Magnetotransport in the normal state ofLa1.85Sr0.15Cu1
Malinowski
¹
,
Cieplak
²
,
Guha
³

et al. 2002
Phys. Rev. B
25
4
23
0
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We have studied the magnetotransport properties in the normal state for a series of La1.85Sr0.15Cu1−yZnyO4 films with values of y, between 0 and 0.12. A variable degree of compressive or tensile strain results from the lattice mismatch between the substrate and the film, and affects the transport properties differently from the influence of the zinc impurities. In particular, the orbital magnetoresistance (OMR) varies with y but is strain-independent. The relations for the resistivity (ρ = ρ0 + AT ) and the Hall angle (cot ΘH = αT 2 + C), and the proportionality between the OMR and tan 2 ΘH (∆ρ/ρ = ζ tan 2 ΘH ) are followed above about 70 K. We have been able to separate the strain and impurity effects by rewriting the last two of these relations as cot ΘH /α = T 2 + C/α and ∆ρ/ρ = (ζ/α 2 )(α 2 tan 2 ΘH), where each term is strain-independent and depends on y only. We also find that changes in the lattice constants give rise to closely the same fractional changes in A, C, and α, while ρ0 is, in addition, increased by changes in the microstructure. The OMR is more strongly suppressed by the addition of impurities than tan 2 ΘH , so that ζ decreases as y increases. We conclude that the relaxation rate that governs the Hall effect is not the same as for the magnetoresistance. We also suggest a correspondence between the transport properties and the opening of the pseudogap at a temperature which changes when the La-Sr ratio changes, but does not change with the addition of the zinc impurities. Several theoretical models seem to be in conflict with our results. Some recent ones may be more compatible, but have not been carried sufficiently far for a detailed comparison. 74.72.Dn, 74.76.Bz, 74.25.Fy, 74.20.Mn

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“…Previously we have argued [8] for the presence of strong Coulomb correlations in YBa2Cu30 x. The data of figs.…”

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confidence: 79%

RESISTIVITY OF EuBa2(Cu1-yZny)3Ox AS A FUNCTION OF TEMPERATURE, MAGNETIC FIELD, PRESSURE AND Zn CONCENTRATION

Borges

Wells

Cheong

et al. 1987

Proceedings of the Yamada Conference XVIII on Superconductivity in Highly Correlated Fermion Systems

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We report electrical resistance and magnetoresistance measurements on EuBa2(Cu 1 yZnv)30 x under pressures to 17kbar. With Zn substitution, T c is depressed rapidly (--19K/at.%Zn) and there are qualitative changes in the temperature and field response of the resistance. Pressure drives the Zn-substituted samples toward undoped EuBa2Cu30 ~ behavior. Analysis of the temperature dependent resistance for y =0.05 and P = 0, together with Hall effect and thermopower data, suggests that the suppression of superconductivity may arise from weak three-dimensional localization promoted by Coulomb interactions.

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Normal-state properties ofABa2Cu3O7<

Cited by 108 publications

References 10 publications

Evidence for electronic localization in YBa2−yLayCu3Ox

Evidence for electronic localization in YBa2−yLayCu3Ox

Magnetotransport in the normal state ofLa1.85Sr0.15Cu1
Malinowski
¹
,
Cieplak
²
,
Guha
³

et al. 2002
Phys. Rev. B
25
4
23
0
View full text Add to dashboard Cite

RESISTIVITY OF EuBa2(Cu1-yZny)3Ox AS A FUNCTION OF TEMPERATURE, MAGNETIC FIELD, PRESSURE AND Zn CONCENTRATION

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Normal-state properties ofABa2Cu3O7<

Cited by 108 publications

References 10 publications

Evidence for electronic localization in YBa2−yLayCu3Ox

Evidence for electronic localization in YBa2−yLayCu3Ox

Magnetotransport in the normal state ofLa1.85Sr0.15Cu1Malinowski1, Cieplak2, Guha3 et al. 2002Phys. Rev. B254230View full textAdd to dashboardCite

RESISTIVITY OF EuBa2(Cu1-yZny)3Ox AS A FUNCTION OF TEMPERATURE, MAGNETIC FIELD, PRESSURE AND Zn CONCENTRATION

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Magnetotransport in the normal state ofLa1.85Sr0.15Cu1
Malinowski
¹
,
Cieplak
²
,
Guha
³

et al. 2002
Phys. Rev. B
25
4
23
0
View full text Add to dashboard Cite