GROWTH OF SINGLE-CRYSTALS, THERMAL DEPENDENCY OF LATTICE-PARAMETERS AND RAMAN-SCATTERING IN THE ND2-XCEXCUO4-DELTA SYSTEM

被引：36

作者：

SADOWSKI, W

HAGEMANN, H

FRANCOIS, M

BILL, H

PETER, M

WALKER, E

YVON, K

机构：

[1] UNIV GENEVA,DEPT CHIM PHYS,CH-1211 GENEVA 4,SWITZERLAND

[2] UNIV GENEVA,CRISTALLOG LAB,CH-1211 GENEVA 4,SWITZERLAND

来源：

PHYSICA C | 1990年 / 170卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(90)90235-7

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the growth of Nd2-xCexCuO4-δ single crystals (0<x<0.2) from Cu2O flux. Free separated crystals with maximum size of 5x8x0.15 nm3 have been obtained. Magnetic AC susceptibility measurements show a sharp superconducting transition at temperatures up to 23 K. The temperature dependence of the lattice parameters has been measured by means of X-ray powder diffraction between 10 K (a=3.9413(3) A ̊, c=12.0290(18) A ̊) and 290 K (a=3.9482(3) A ̊, c=12.0590(18) A ̊). Room temperature Raman spectra reveal a new band at 320 cm-1 which is not observed in Nd2CuO4. Raman spectra of crystals with Tc ranging from 7 to 22 K show a systematic intensity change of the broad band at 590 cm-1. © 1990.

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页码：103 / 111

页数：9

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