Desorption of oxygen from YBa2Cu3O6+x films studied by Raman spectroscopy

被引：12

作者：

Bock, A ^{[1
]}

Kursten, R ^{[1
]}

Bruhl, M ^{[1
]}

Dieckmann, N ^{[1
]}

Merkt, U ^{[1
]}

机构：

[1] UNIV HAMBURG,ZENTRUM MIKROSTRUKTURFORSCH,D-20355 HAMBURG,GERMANY

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.54.4300

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phonons of laser-deposited YBa2Cu3O6+x films on MgO(100) substrates are investigated in a Raman setup as a function of laser power density. Investigations of YBa2Cu3O7 films allow us to study oxygen out-diffusion, where the onset of out-diffusion is indicated by the appearance of disorder-induced modes in the Raman spectra. At a pressure of 5 x 10(-6) mbar the temperature threshold of the out-diffusion is (490+/-15) K. With increasing oxygen pressure the observed temperature thresholds rise only moderately in contrast to the behavior expected from the p(ox)-T phase diagram of YBa2Cu3O6+x. Even at 1 bar oxygen partial pressure out-diffusion is observed and tetragonal sites with x = 0 develop. These observations can be explained by photon-stimulated desorption of oxygen. Investigations of YBa2Cu3O6 films allow us to study oxygen in-diffusion. In 1 bar oxygen we observe competing oxygen fluxes due to thermally activated diffusion and photon-stimulated desorption. From these measurements we determine an upper bound of the thermal activation energy of the oxygen in-diffusion into YBa2Cu3O6 films of (0.19+/-0.01) eV.

引用

页码：4300 / 4309

页数：10

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