ROOM-TEMPERATURE OXYGEN DIFFUSION AND ORDERING IN YBA2CU3O7-Y STUDIED WITH TIME-RESOLVED RAMAN-SPECTROSCOPY

被引：19

作者：

POBERAJ, I ^{[1
]}

MIHAILOVIC, D ^{[1
]}

BERNIK, S ^{[1
]}

机构：

[1] E KARDELJ UNIV LJUBLJANA,FAC SCI,YU-61111 LJUBLJANA,YUGOSLAVIA

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.42.393

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxygen diffusion and ordering is studied in YBa2Cu3O7- single crystals as a function of time after oxygen is ejected from the surface with a strong laser pulse. Features in the Raman spectra that are sensitive to oxygen concentration and disorder are monitored by time-resolved spectroscopy. The experiments clearly show that room-temperature diffusion takes place from the bulk YBa2Cu3O7 into the oxygen-depleted YBa2Cu3O6+y surface. There appear to be a fast (<5 ms) and a relatively slow (>1 min) lifetime to the observed features. We suggest that diffusion in YBa2Cu3O6+y, which is shown to proceed via hopping of oxygen along vacancy positions, may be aided by anharmonic features of the lattice in addition to the chemical potential gradient at the YBa2Cu3O6+y (surface) YBa2Cu3O7 (bulk) interface. © 1990 The American Physical Society.

引用

页码：393 / 398

页数：6

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