Comparison of the pressure dependencies of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>in the 90-K superconductors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mm

Borges, H. A.; Kwok, R.S.; Thompson, J. D.; Wells, G.L.; Smith, J. L.; Fisk, Z.; Peterson, Alissa

doi:10.1103/physrevb.36.2404

Cited by 59 publications

(6 citation statements)

References 12 publications

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“…Pressure both decreases the resistivity in the normal state and increases the superconducting temperature, as has been found in the Y compound as well as in other Ln (Gd, Er, Yb) compounds [37,38]. However, the values of dTc/dP obtained in the Sm compound of 0.4 to 0.5 K kbar-1 are larger than those reported for other materials (0.09 to 0.19 K kbar-1) in Ref.…”

contrasting

confidence: 52%

High temperature superconductivity in SmBa2Cu3O 7-x : transport properties and effect of pressure

Marcus¹,

Escribe-Filippini²,

Reydet³

et al. 1988

J. Phys. France

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Sintered powders of SmBa2Cu3O7-x have been prepared and characterized. The physical properties, superconducting temperature transition, up to 92 K, magnetic susceptibility, electrical resistivity and thermopower have been studied as a function of the preparation conditions and therefore of oxygen stoichiometry. The upper critical field has been estimated from resistivity measurements in fields up to 8 T and the slope (dBc2/dT)Tc found to be close to 4 TK-1 for the highest Tc samples. Studies of the electrical resistivity under hydrostatic pressures up to 18 kbar show an increase of Tc under pressure with dTc/dp ∼ 0.5 K kbar-1. Finally measurements of voltage-current characteristics indicate that either Josephson junctions or superconductor-insulator-normal metal junctions can be found inside the samples, as expected in inhomogeneous materials

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contrasting

confidence: 52%

High temperature superconductivity in SmBa2Cu3O 7-x : transport properties and effect of pressure

Marcus¹,

Escribe-Filippini²,

Reydet³

et al. 1988

J. Phys. France

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“…It seems unlikely that all high-To materials would have a comparable energy dependence of ~(E) around EF, or that pressure would favor stronger electron-phonon coupling in each system. Another feature common to all the high-To materials is the increased conductivity above Tc with decreasing volume [90,92 ]. Unfortunately, no measurements have been made on the effect of pressure on the anisotropic conductivity in single crystals, but taking the results on sintered compacts leads to the problem of understanding the interrelationship between enhanced superconductivity and increased conductivity.…”

Section: Superconductivitymentioning

confidence: 99%

“…To place these in perspective, dTddP for the Al5 compounds V3Si with T~= 16.8 K is ~0.035 K/kbar [91 ]. Further, high-T~ cuprates show a strong, positive change in Tc with pressure [ 89,[90][91][92][93]; whereas the elements [ 94 ] and A15 compounds [95] have dT~/dP both positive and negative. In these latter cases, in which superconductivity is well established to arise from electron-phonon coupling, the sign of dT~/dP can be understood as arising generally from changes in the phonon spectrum with pressure that compete with a pressure derivative of the electron-density of states at the Fermi level ~(EF) which can be either positive or negative.…”

Section: Superconductivitymentioning

confidence: 99%

Properties of La2CuO4 and related compounds

Cheong

Thompson

Fisk

1989

Physica C: Superconductivity

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119

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We review the crystal chemical, electronic, magnetic and superconducting properties of La2CuO4 and related planar-cuprate materials, with emphasis on single-crystal results. Although magnetism due to divalent copper ions clearly is evident in nonsuperconducting crystals, experiments do not reveal any direct relationship between localized copper spins and high temperature superconductivity. We also indicate areas where important information is lacking for our understanding of these materials.

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“…2 The inset of fig. 2 shows that dTjdP is almost ten times larger for x = 0.01 than for x = 0 and for other RBa2C%O ~ samples previously studied [6]. on the magnetic and thermal history of the sample.…”

mentioning

confidence: 74%

Resistivity of EuBa2(Cu1−yZny)3Ox as a function of temperature, magnetic field, pressure and Zn concentration

et al. 1987

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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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Comparison of the pressure dependencies ofTcin the 90-K superconductorsRBa2

Cited by 59 publications

References 12 publications

High temperature superconductivity in SmBa2Cu3O 7-x : transport properties and effect of pressure

High temperature superconductivity in SmBa2Cu3O 7-x : transport properties and effect of pressure

Properties of La2CuO4 and related compounds

Resistivity of EuBa2(Cu1−yZny)3Ox as a function of temperature, magnetic field, pressure and Zn concentration

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