Thermoelectric and thermomagnetic effects in Nd1.85Ce0.15CuOx epitaxial thin films

H. Hänsel; F. Gollnik; A. Beck; R. Gross

doi:10.1016/0921-4534(94)91908-9

Thermoelectric and thermomagnetic effects in Nd_1.85Ce_0.15CuO_x epitaxial thin films

H. Hänsel, F. Gollnik, A. Beck, R. Gross

University of Tübingen

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Epitaxial, c-axis oriented Nd_1.85Ce_0.15CuO_x thin films have been fabricated on (100) SrTiO₃ substrates by hollow cathode magnetron sputtering. The mixed state of the films has been characterized by measuring the longitudinal resistivity and Nernst effect in magnetic fields up to 6T applied parallel to the c-axis. From the resistivity data an upper critical field slope dH_c2/dT = -0.35 T/K was obtained for films with T_c ≅ 22 K corresponding to an ab-plane coherence length ξ_ab = 79 A ̊. From the Nernst effect data the temperature derivative of the transport energy of magnetic flux lines was derived to dU_φ/dT = -2.4 × 10^-13J/Km. At T = 18 K and H = 0.5 T the transport entropy of magnetic flux lines was obtained to S_φ = 1.6 × 10^-14 J/Km. These values are in reasonable agreement with the prediction of time dependent Ginzburg-Landau theory. The measured data are compared to those obtained for epitaxial YBa₂Cu₃O_7-δ and Bi₂Sr₂CaCu₂O_8+x thin films.

Original language	English
Pages (from-to)	1367-1368
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	235-240
Issue number	PART 2
DOIs	https://doi.org/10.1016/0921-4534(94)91908-9
State	Published - Dec 1994
Externally published	Yes

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title = "Thermoelectric and thermomagnetic effects in Nd1.85Ce0.15CuOx epitaxial thin films",

abstract = "Epitaxial, c-axis oriented Nd1.85Ce0.15CuOx thin films have been fabricated on (100) SrTiO3 substrates by hollow cathode magnetron sputtering. The mixed state of the films has been characterized by measuring the longitudinal resistivity and Nernst effect in magnetic fields up to 6T applied parallel to the c-axis. From the resistivity data an upper critical field slope dHc2/dT = -0.35 T/K was obtained for films with Tc ≅ 22 K corresponding to an ab-plane coherence length ξab = 79 A ̊. From the Nernst effect data the temperature derivative of the transport energy of magnetic flux lines was derived to dUφ/dT = -2.4 × 10-13J/Km. At T = 18 K and H = 0.5 T the transport entropy of magnetic flux lines was obtained to Sφ = 1.6 × 10-14 J/Km. These values are in reasonable agreement with the prediction of time dependent Ginzburg-Landau theory. The measured data are compared to those obtained for epitaxial YBa2Cu3O7-δ and Bi2Sr2CaCu2O8+x thin films.",

author = "H. H{\"a}nsel and F. Gollnik and A. Beck and R. Gross",

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T1 - Thermoelectric and thermomagnetic effects in Nd1.85Ce0.15CuOx epitaxial thin films

AU - Hänsel, H.

AU - Gollnik, F.

AU - Beck, A.

AU - Gross, R.

PY - 1994/12

Y1 - 1994/12

N2 - Epitaxial, c-axis oriented Nd1.85Ce0.15CuOx thin films have been fabricated on (100) SrTiO3 substrates by hollow cathode magnetron sputtering. The mixed state of the films has been characterized by measuring the longitudinal resistivity and Nernst effect in magnetic fields up to 6T applied parallel to the c-axis. From the resistivity data an upper critical field slope dHc2/dT = -0.35 T/K was obtained for films with Tc ≅ 22 K corresponding to an ab-plane coherence length ξab = 79 A ̊. From the Nernst effect data the temperature derivative of the transport energy of magnetic flux lines was derived to dUφ/dT = -2.4 × 10-13J/Km. At T = 18 K and H = 0.5 T the transport entropy of magnetic flux lines was obtained to Sφ = 1.6 × 10-14 J/Km. These values are in reasonable agreement with the prediction of time dependent Ginzburg-Landau theory. The measured data are compared to those obtained for epitaxial YBa2Cu3O7-δ and Bi2Sr2CaCu2O8+x thin films.

AB - Epitaxial, c-axis oriented Nd1.85Ce0.15CuOx thin films have been fabricated on (100) SrTiO3 substrates by hollow cathode magnetron sputtering. The mixed state of the films has been characterized by measuring the longitudinal resistivity and Nernst effect in magnetic fields up to 6T applied parallel to the c-axis. From the resistivity data an upper critical field slope dHc2/dT = -0.35 T/K was obtained for films with Tc ≅ 22 K corresponding to an ab-plane coherence length ξab = 79 A ̊. From the Nernst effect data the temperature derivative of the transport energy of magnetic flux lines was derived to dUφ/dT = -2.4 × 10-13J/Km. At T = 18 K and H = 0.5 T the transport entropy of magnetic flux lines was obtained to Sφ = 1.6 × 10-14 J/Km. These values are in reasonable agreement with the prediction of time dependent Ginzburg-Landau theory. The measured data are compared to those obtained for epitaxial YBa2Cu3O7-δ and Bi2Sr2CaCu2O8+x thin films.

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IS - PART 2

ER -

Thermoelectric and thermomagnetic effects in Nd_1.85Ce_0.15CuO_x epitaxial thin films

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