PROBING THE FERMI LEVEL OF Y1-XPRXBA2CU3O7-DELTA BY FEMTOSECOND SPECTROSCOPY

被引：39

作者：

KAZEROONIAN, AS

CHENG, TK

BRORSON, SD

LI, Q

IPPEN, EP

WU, XD

VENKATESAN, T

ETEMAD, S

DRESSELHAUS, MS

DRESSELHAUS, G

机构：

[1] MIT,CTR MAT SCI & ENGN,CAMBRIDGE,MA 02139

[2] MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139

[3] MIT,ELECTR RES LAB,CAMBRIDGE,MA 02139

[4] RUTGERS STATE UNIV,DEPT PHYS,PISCATAWAY,NJ 08854

[5] MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139

[6] BELL COMMUN RES INC,RED BANK,NJ 07701

来源：

SOLID STATE COMMUNICATIONS | 1991年 / 78卷 / 02期

关键词：

D O I：

10.1016/0038-1098(91)90260-3

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Femtosecond spectroscopy at room temperature indicates a monotonic rise in the Fermi level E(F) vs. Pr concentration x in Y1-xPr(x)Ba2Cu3O7-delta. For x = 0.12 +/- 0.02, the Fermi level lies 2.0 eV below the unoccupied Cu d bands. The decrease in T(c) with increasing x is consistent with a band filling model. The room temperature decay time tau of the transient reflectivity DELTA-R increases from tau < 60 fs in superconducting YBa2Cu3O7-delta to tau = 140 fs in non-superconducting PrBa2Cu3O7-delta. The effects of Pr substitution for Y on the position of the Fermi level are qualitatively similar to the effects of de-oxygenation on the E(F) of YBa2Cu3O7-delta.

引用

页码：95 / 98

页数：4

共 26 条

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