a Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China; b Chinese Center of Advanced Science and Technology (World Laboratory), Beijing 100080, China; Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, Ghina
Abstract Lattice vibrations of the (Hg,Mo)Sr2(Y1-xCax)Cu2O6+$\delta$—a new series of mercury-based high-Tc superconductor are analyzed with the aid ofgroup theory. The vibrations of species are given. They are 4A1g+ B1g+ 5Eg+ 7A2u + B2u+ 8Eu. The 4A1g, B1g and 5Eg modes are Ramma active, the 6A2u and 7Eu are infrared active. Phonon vibration characteristics of the samples are studied using Raman scattering and infrared absorption spectra. The experimental results show that the typical phonon vibrational modes appear mainly at 145, 320, 440, 578, 592 and 645cm-1, The intensities of the 145, 320, 440, 578 and 645 peaks decrease with increasing Ca content x and the position of 645 peak moves to higher wavenumber slightly. In this article, the phonan modes are assigned and their variation behavior with increasing Ca content x are discussed.
Received: 25 December 1995
Accepted manuscript online:
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