TY - JOUR
T1 - Surface chemical decomposition of HgBa2 CuO4+σ by high powered laser radiation
AU - Chang, H.
AU - Xiong, Q.
AU - Xue, Y. Y.
AU - Chu, C. W.
N1 - Funding Information:
We thank Y.T. Ren for the helpful discussion. HC is grateful to the other coauthors, and wishes to especially thank C.W. Chu for the hospitality extended to him during his visit to the Texas Center for Superconductivity at the University of Houston. This work is supported by USAFOSR F49620-93-1-0310, NSF Grant No. DMR 91-22043, the State of Texas through the Texas Center for Superconductivity at the University of Houston, and the T.L.L. Temple Foundation.
PY - 1995/6/10
Y1 - 1995/6/10
N2 - The Raman bands of Ba2CuO3 at 563 cm-1 and of Hg-1201 at 571 and 591 cm-1 were observed on a HgBa2CuO4+σ (Hg-1201) crystal under laser irradiation with a power of 2 to 3 mW/μm2 and at a short acquisition time of 1 s, indicating the formation of Ba2CuO3 on thesurface 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 newe Ba-O bonds form. In this manner, the HgBa2CuO4+σ on the surface of a crystal turns into a layer of Ba2CuO3.
AB - The Raman bands of Ba2CuO3 at 563 cm-1 and of Hg-1201 at 571 and 591 cm-1 were observed on a HgBa2CuO4+σ (Hg-1201) crystal under laser irradiation with a power of 2 to 3 mW/μm2 and at a short acquisition time of 1 s, indicating the formation of Ba2CuO3 on thesurface 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 newe Ba-O bonds form. In this manner, the HgBa2CuO4+σ on the surface of a crystal turns into a layer of Ba2CuO3.
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U2 - 10.1016/0921-4534(95)00225-1
DO - 10.1016/0921-4534(95)00225-1
M3 - Article
AN - SCOPUS:0029321556
SN - 0921-4534
VL - 248
SP - 15
EP - 21
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 1-2
ER -