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Titolo:
Far-infrared reflectance and transmittance studies of YBa2Cu3O7-x single-crystal thin films
Autore:
Shibata, H; Kimura, S; Kashiwaya, S; Ueno, S; Koyanagi, M; Terada, N; Kawate, E; Tanaka, Y;
Indirizzi:
Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan Electrotech Lab Tsukuba Ibaraki Japan 3058568 uba, Ibaraki 3058568, Japan Univ Tsukuba, Tsukuba, Ibaraki 3058577, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3058577 sukuba, Ibaraki 3058577, Japan Kagoshima Univ, Kagoshima 099065, Japan Kagoshima Univ Kagoshima Japan 099065 hima Univ, Kagoshima 099065, Japan Natl Res Lab Metrol, Tsukuba, Ibaraki 3058563, Japan Natl Res Lab Metrol Tsukuba Ibaraki Japan 3058563 Ibaraki 3058563, Japan Nagoya Univ, Chikusa Ku, Nagoya, Aichi 4648601, Japan Nagoya Univ Nagoya Aichi Japan 4648601 a Ku, Nagoya, Aichi 4648601, Japan
Titolo Testata:
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
fascicolo: 5A, volume: 40, anno: 2001,
pagine: 3163 - 3170
SICI:
0021-4922(200105)40:5A<3163:FRATSO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-TC SUPERCONDUCTOR; PENETRATION DEPTH; TEMPERATURE-DEPENDENCE; DOMAIN YBA2CU3O7; ENERGY-GAP; C-AXIS; CONDUCTIVITY; PSEUDOGAP; STATE; TRANSMISSION;
Keywords:
high temperature superconductors; far-infrared optical conductivity; YBa2Cu3O7-x; symmetry of the superconducting pairing state; superconducting energy gap; two-fluid model; superfluid fraction; normal fluid fraction; R-T method;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Shibata, H Electrotech Lab, 1-1-4 Umezono, Tsukuba, Ibaraki 3058568, JapanElectrotech Lab 1-1-4 Umezono Tsukuba Ibaraki Japan 3058568 pan
Citazione:
H. Shibata et al., "Far-infrared reflectance and transmittance studies of YBa2Cu3O7-x single-crystal thin films", JPN J A P 1, 40(5A), 2001, pp. 3163-3170

Abstract

A new method of estimating the optical constants of thin films has been developed and applied to YBa2Cu3O7-x epitaxial single-crystal thin films (T-e= 90 K) grown on MgO substrates to determine the far-infrared optical conductivity sigma (ab)(Co), which is the response when an unpolarized excitation is applied parallel to the ab-plane in multidomain (twinned) single crystals of YBa2Cu3O7-x. In this method, both the transmittance spectra T(omega) and reflectance spectra R(omega) are measured as a function of the wave number w, and the results are substituted into a set of coupled equations which exactly describe R(omega) and T(omega) of thin films on substrates, where the complex refractive index N = n + ik of the thin films is an unknown parameter. The coupled equations are numerically solved using the Newton method, and the values of n and k are determined as a function of omega. We have determined sigma (ab)(omega) of YBa2Cu3O7-x thin films for w = 50-250 cm(-1) at T = 34-97 K. Analysis of the temperature dependence of sigma (ab)(omega) based on the two-fluid model suggests that the symmetry of the superconducting pairing state of the specimen is d-wave.

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Documento generato il 04/04/20 alle ore 08:46:53