SURFACE CHEMICAL DECOMPOSITION OF HGBA2CUO4+DELTA BY HIGH-POWERED LASER-RADIATION

被引：13

作者：

CHANG, H

XIONG, Q

XUE, YY

CHU, CW

机构：

[1] UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204

[2] UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204

来源：

PHYSICA C | 1995年 / 248卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0921-4534(95)00225-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The Raman bands of Ba2CuO3 at 563 cm(-1) and of Hg-1201 at 571 and 591 cm(-1) were observed on a HgBa2CuO4+delta (Hg-1201) crystal under laser irradiation with a power of 2 to 3 mW/mu m(2) and at a short acquisition time of 1 a, indicating the formation of Ba2CuO3 on the surface of the Hg-1201 crystallite. The Ba2CuO3 decomposed to BaCuO2 under higher laser irradiation. We suggest that a two-step chemical reaction occurred on the surface of the crystal. First, a HgO segment is drawn out of the crystallite, leaving a vacant plane. The crystallite then collapses, the upper part displaced by a/2 and b/2, and new Ba-O bonds form. In this manner, the HgBa2CuO4+delta on the surface of a crystal turns into a layer of Ba2CuO3.

引用

页码：15 / 21

页数：7

共 10 条

[1]

Hadjiev, Thomsen, Erb, Muller-Vogt, Koblischka, Cardona, Solid State Commun., 80, (1991)

[2]

Ren, Chang, Xiong, Wang, Sun, Meng, Xue, Chu, Physica C, 217, (1993)

[3]

Ren, Chang, Xiong, Xue, Chu, Physica C, 226, (1994)

[4]

Hor, Lee, Park, Shin, Yang, Raman studies on single-phasic HgBa2CuO4+δ superconductors, Physica C: Superconductivity, 218, (1993)

[5]

Krantz, Thomsen, Mattausch, Cardona, Phys. Rev. B, 50, (1994)

[6]

Yang, Lee, Shin, Park, Lee, Lee, Physica C, 222, (1994)

[7]

Meng, Beauvais, Zhang, Haung, Sun, Chu, Physica C, 216, (1993)

[8]

Putilin, Antipov, Chmaissem, Marezio, Nature (London), 362, (1993)

[9]

Abbattista, Vallino, Brisi, Lucco-Borlera, Mater. Res. Bull., 23, (1988)

[10]

Kipka, Muller-Buschbaum, Z. Naturf. B, 32, (1977)

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