Far IR transmission spectra of an YBa2Cu3O7-δ thin film sputtered on an MgO single crystal

Gerbaux, X.; Tazawa, Masato; Hadni, A.; Hubsch, J.; Kitade, Atsuo

doi:10.1016/0020-0891(91)90032-b

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…3 but a smaller value (eo = 3.3 x lo-' Qm) of the dc resistivity. The average value is still matching closely the experimental curve Now, the collision frequency v, being written as [2]Y, = 2ncEO&,v;@,(T),(2) vp being constant and eo(T) a linear function of temperature T , we have also a linear function of temperature for v,. In the special case considered here v, = 0.69T[3].…”

supporting

confidence: 63%

“…At all temperatures it is about 1.7 times lower than for a previous sample studied in [2]. The superconducting transition temperature T, is now well above liquid nitrogen temperature (86 K instead of 76 K for the thin film used in [2]). The transition is still very sharp with AT = 1.5 K for a change in dc resistivity from 90 to 10% of the extrapolated normal resistivity.…”

Section: Ybacuo Films Of Higher Qualitymentioning

confidence: 64%

“…The spectrometer is the same Fourier transform Michelson interferometer used previously [2], with a Ge: Ga bolometer placed in a liquid helium cryostat. The YBaCuO sample is cooled in a different cryostat where it is surrounded by He gas at a temperature monitored with a silicon diode thermometer located at a short distance from the sample.…”

Section: Fir Spectrometer With a High Luminositymentioning

confidence: 99%

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High‐ T_c YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

Hadni

Gerbaux

Villégier³

1993

Physica Status Solidi (b)

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Transmission spectroscopy in the very far IR (10 to 50cm-') is shown to be efficient to gct dc conductivity, plasma frequency, and collision frequency at different temperatures in the normal state (e.g. 210 and 125 K), and the superconducting state (e.g. 79 to 65 and 8 K), for an YBa2Cu30,-d (YBaCuO) thin film. For a given sample a plasma frequency vp = 6500 f lo00 cm-' independent of temperature, a collision frequency depending linearly on temperature, v, = 0.69T (in an-') and a negligible transmission T at v = lOcm-' for T = 8 K (z < 2 x 10-3 are found, showing that the amount of YBa,Cu306 insulating impurity is very low. A two-fluid model is used to explain the spectra at T = 65 and 80 K, with a concentration N , of superconductive electrons given by a T4 law, N, = N,[I -(T/TJ4], which seems to be acceptable as a first approximation where the collision frequency for normal electrons is assumed to be saturated around 40 cm-' at T < 65 K, to fit the data. Such a collision frequency is corresponding to a mean free path I = 212 A if we take a Fermi velocity vF = 200 km s-' and 1 = vF/2ncv,.La spectroscopie des supraconducteurs par transmission dans I' IR lointain (10 a 50 cm-I) permet d'obtenir la frtquence de plasma et la frequence de collision avec une precision meilleure que ne donnet les mesures par reflection, si I'on peut disposer d'un film supraconducteur tr6s mince (p. ex. 30 nm). Pour un Bchantillon donne, on a trouve une frkquence de plasma vp = 6500 5 lo00 cm-' independante de la tempbrature, une frtquence de collision dependant linbairement de T : v , = 0.69T (en cm-') et une transmission a 8 K negligeable pour v = 10 cm-', montrant que le film est relativement exempt d'impuretes isolantes. Un modele a deux fluides permet d'interpreter les spectres a 65 et 80 K en adoptant une loi en T4 pour la concentration en quasiparticules, en admettant que leur frequence de collision se sature a 40 cm-' pour T < 65 K.

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supporting

confidence: 63%

Section: Ybacuo Films Of Higher Qualitymentioning

confidence: 64%

Section: Fir Spectrometer With a High Luminositymentioning

confidence: 99%

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High‐ T_c YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

Hadni

Gerbaux

Villégier³

1993

Physica Status Solidi (b)

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Surface resistance and far infrared absorptivity at T=7 K of highT c YBaCuO superconductors

Gerbaux¹,

Hadni²

1992

Int J Infrared Milli Waves

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Surface layers and far infrared spectra of High-Tc superconductors

Hadni¹,

Gerbaux²,

Tazawa³

1993

Infrared Physics

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Far IR transmission spectra of an YBa2Cu3O7-δ thin film sputtered on an MgO single crystal

Cited by 4 publications

References 13 publications

High‐ T_c YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

High‐ T_c YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

Surface resistance and far infrared absorptivity at T=7 K of highT c YBaCuO superconductors

Surface layers and far infrared spectra of High-Tc superconductors

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Far IR transmission spectra of an YBa2Cu3O7-δ thin film sputtered on an MgO single crystal

Cited by 4 publications

References 13 publications

High‐ Tc YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

High‐ Tc YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

Surface resistance and far infrared absorptivity at T=7 K of highT c YBaCuO superconductors

Surface layers and far infrared spectra of High-Tc superconductors

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Product

Resources

About

High‐ T_c YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra

High‐ T_c YBaCuO Superconductor Plasma and Collision Frequency Calculated from the Very Far Infrared Transmission Spectra