SURFACE PHONONS ON BI2SR2CACU2O8+DELTA

被引：9

作者：

PHELPS, RB

AKAVOOR, P

KESMODEL, LL

DEMUTH, JE

MITZI, DB

机构：

[1] INDIANA UNIV,MAT RES INST,BLOOMINGTON,IN 47405

[2] IBM CORP,THOMAS J WATSON RES CTR,RES DIV,YORKTOWN HTS,NY 10598

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.48.12936

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report measurements of surface optical phonons on Bi2Sr2CaCu2O8+delta with high-resolution electron-energy-loss spectroscopy (HREELS). In addition to peaks near 50 and 80 meV (403 and 645 cm-1), which have been previously observed, our loss spectra exhibit a peak at 26 meV (210 cm-1). Loss spectra were measured at temperatures from 45 to 146 K, and the temperature dependence of the peaks was found to be weak. The 50 and 80 meV peaks shift to lower frequency by approximately 1.5 meV over this temperature range. All three peaks are attributed to surface optical phonons. The identification of particular bulk modes corresponding to the surface modes observed with HREELS is discussed.

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页码：12936 / 12940

页数：5

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