Thermal conductivity of twinned YBa2Cu3O7-x and tweeded YBa2(Cu0.95Fe0.05)3O7-x in a magnetic field: Evidence for intrinsic proximity effect

Bougrine, Hassan; Sergeenkov, S.; Ausloos, Marcel; Mehbod, Mohammad

doi:10.1016/0038-1098(93)90099-9

Cited by 20 publications

(13 citation statements)

References 12 publications

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“…The data on the total magnetothermal conductivity κ(B) of an untwinned single crystal of YBa 2 Cu 3 O 7−δ [2] and of polycrystalline samples of YBa 2 Cu 3 O 7−δ and YBa 2 (Cu 0.95 Fe 0.05 ) 3 O 7−δ [4] are shown in figure 2 and figure 3, respectively. Recent 4.…”

Section: Resultsmentioning

confidence: 99%

“…Recent 4. Sample preparation and experimental methods to measure the temperature and magnetic induction dependence of the thermal conductivity of these samples were described in [2,4,6]. One can see that κ decreases rapidly for B < 2 T and then 'saturates' for higher values of the induction.…”

Section: Resultsmentioning

confidence: 99%

“…The thermal conductivity of high-T c superconductors remains an interesting and controversial transport coefficient [1]. The influence of a magnetic field on the thermal conductivity is similar in various high-T c cuprates [2][3][4][5][6][7]; the magnetothermal conductivity κ(B) is observed to decrease as the magnetic induction B is increased and this relative decrease is less pronounced when the temperature is raised.…”

Section: Introductionmentioning

confidence: 99%

“…These workers obtained an unusual stretched exponential B exp(−B 1/4 ) behaviour for the excess thermal resistivity in the temperature range near T c /2. Bougrine et al [4] derived the origin of such a theoretical law from a model including bound and free vortices on intragranular and intergranular defects. The exponent 1/4 was shown to be a particular value specific to the (B, T ) regime examined by Richardson et al In fact, characteristic lengths such as the mean free path, the penetration depth and the characteristic defect size control the value of the exponent in the stretched exponential.…”

Section: Introductionmentioning

confidence: 99%

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Influence of a magnetic field on the thermal conductivity of d-wave high- superconductors

Houssa

Ausloos

1997

J. Phys.: Condens. Matter

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The influence of a magnetic field on the electronic contribution κ e to the thermal conductivity of a d-wave superconductor is described. We use the kinetic expression for κ e in terms of a number of carriers deduced from the electronic specific heat of a d-wave superconductor. We calculate the field and temperature dependence of the scattering rate of normal heat-carrying electrons scattered by quasi-particle excitations in the 2D-like vortex cores. Near T c , the experimental results on various YBa 2 Cu 3 O 7−δ and Bi 2 Sr 2 CaCu 2 O 8 samples are quite well reproduced by this model, as in the s-wave case with a small difference between the deduced physical parameters. However, experimental results on the field dependence of the thermal conductivity at very low temperatures are shown to be incompatible with an s-wave gap parameter but can be explained by considering a d-wave order parameter. More reasonable parameter values are found herein.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of a magnetic field on the thermal conductivity of d-wave high- superconductors

Houssa

Ausloos

1997

J. Phys.: Condens. Matter

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“…An unusual stretched exponential B exp (−B 1/4 ) behaviour for the excess thermal resistivity in the temperature range near T c /2 was obtained by Bougrine et al [11]; see also ref. [12].…”

Section: Activation Energymentioning

confidence: 55%

Electrical and thermal transport properties in high Tc superconductors: effects of a magnetic field

Ausloos

2001

Physica C: Superconductivity

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Experimental studies of the electric and heat currents in the normal, superconducting and mixed states of high T c superconductors (HTcS) lead to characterization, complementary to data obtained from equilibrium property based techniques. A magnetic field superimposed on the superconducting sample generates magneto-transport phenomena, from which an excess electrical resistivity, an excess thermoelectric power, the Hall or the Nernst effect. Different behavioral effects allow one to distinguish various dissipation mechanisms, like quasi particle scattering, vortex motion dissipation and superconductivity fluctuations, in particular when the Corbino geometry is used. Moreover bulk measurements of the thermal conductivity and the electrothermal conductivity in a magnetic field give us sure indications of the order parameter symmetry. The location of the mixed state phase transition lines in the technological phase diagram of HTcS are briefly pointed out through precise measurements performed over broad temperature and magnetic field ranges. The results are mainly reviewed with the aim of defining further investigation lines.

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Vortex Pinning and Dynamics in Perovskite Oxides: Thermal Magneto-Transport in the Mixed State

Ausloos

1999

Nano-Crystalline and Thin Film Magnetic Oxides

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Thermal conductivity of twinned YBa2Cu3O7-x and tweeded YBa2(Cu0.95Fe0.05)3O7-x in a magnetic field: Evidence for intrinsic proximity effect

Cited by 20 publications

References 12 publications

Influence of a magnetic field on the thermal conductivity of d-wave high- superconductors

Influence of a magnetic field on the thermal conductivity of d-wave high- superconductors

Electrical and thermal transport properties in high Tc superconductors: effects of a magnetic field

Vortex Pinning and Dynamics in Perovskite Oxides: Thermal Magneto-Transport in the Mixed State

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