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      저자 : Czeslaw Rudowicz (검색결과 1 건)
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        EPR SPECTRA OF Mn ION WITH TWO PHASES IN THE Y - Ba - Cu - Mn - O HIGH Tc SUPERCONDUCTOR

        Seon Ok Kim,Czeslaw Rudowicz,Soo Hyung Lee,Seong Cho Yu 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5

        In this paper, Mn²+ ion was doped in Y-Ba-Cu-O as an EPR probe. The following samples were prepared by conventional solid-state reaction method: YB_(a2)Cu_(2.96)Mn_(0.04)O_(7-δ) (MN-Ⅰ), annealed YB_(a2)Cu_(2.96)Mn_(0.04)O_(7-δ) (AMN) and YB_(a2)Cu_(2.94)Mn_(0.06)O_(7-δ) (MN-Ⅱ). AMN sample was obtained from MN-Ⅰ by annealing for 1 hr under the Ar gas atmosphere at 600℃. X-band (~9.05 ㎓) EPR spectra were measured from 103 K to room temperature by employing a JES-RE3X spectroscopy with a TE_(011) cylindrical cavity and 100 ㎑ modulation frequency.<br/> In MN-Ⅰ we have observed only the Cu²+ signal. The fact that no Mn²+ signal was observed, in spite of Mn²+ being a very sensitive EPR probe, indicates that most likely isolated Mn²+ ions don't exist in the MN-Ⅰ sample. Most probably Mn²+ ions in the MN-Ⅰ sample interact antiferromagnetically and hence are EPR silent. The AMN spectra of at room temperature and 103 K indicate not only the Cu²+ signal but also an extra signal, which increases with decreasing temperature. It is suggested that the extra signal originates from Mn ions that were antiferromagnetically coupled before the annealing process. In MN - Ⅱ, from 103 K to room temperature, also, the extra signal was observed together with the Cu²+ signal. The extra signal in MN-Ⅱ, however, decreases with decreasing temperature and nearly disappears at 103 K. The signal originates from Mn ions in impurity phases that include Mn²+ ions. We suppose that there exist at least two Mn²+ doped phases in Y-Ba-Cu-O. The Mn²+ signal of one phase is undectable at all temperature and that of another phase decreases with decreasing temperature and disappears around 103 K.

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