9,006 research outputs found

    Dynamically enhanced magnetodielectric effect and magnetic-field-controlled electric relaxations in La-doped BiMnO3

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    Bi ions of multiferroic BiMnO3 were replaced with La ions in order to induce an overlap of the ferroelectric and ferromagnetic transitions in temperature and thus enhance the interproperty coupling. Twenty percent La-doped BiMnO3 in thin-film form shows a broad ferroelectric transition below 150 K; spontaneous magnetization also develops in the transition region. The saturation magnetization and polarization reach 1.6 mu(B)/Mn and 12 mu C/cm(2) at 5 K, respectively. This new magnetic ferroelectric shows a greatly enhanced magnetodielectric effect in the transition region with maximum 45% at 9 T, which is a 70-fold increase compared to that of the pure bulk compound. It is demonstrated that the magnetodielectric effect is dynamically enhanced due to a phenomenon of magnetic-field controlled electric relaxations

    HIGH RESOLUTION FOURIER TRANSFORM EMISSION SPECTROSCOPY OF YH AND YD.

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    Author Institution: Department of Chemistry, University of Arizona; Department of Chemistry, University of WaterlooThe electronic emission spectrum of YH and YD has been investigated in the 690 nm to 3 μm\mu m spectral region using a Fourier transform spectrometer. The YH and YD bands were excited in an yttrium hollow cathode lamp operated with neon gas and a trace of H2H_{2} of D2D_{2} The observed bands have been classified into three different electronic transitions; C1Σ+X1Σ+, d0+(3Σ)X1Σ+C {^{1}\Sigma}^{+}-X {^{1}\Sigma}^{+}, \ d0 {^{+}}({^{3}\Sigma})- X{^{1}\Sigma}^{+} and C3Φa3ΔC^{3} \Phi-a^{3} \Delta. The d0+(3Σ)X1Σ+d0 {^{+}}({^{3}\Sigma})- X{^{1}\Sigma}^{+} transition of YD could not be identified due to its very weak intensity. The rotational analysis of several bands of the C1Σ+X1ΣC {^{1}\Sigma}^{+}-X {^{1}\Sigma}^{-} transition (up to v=3v^{\prime\prime} = 3 for YH and v=2v^{\prime\prime} = 2 for YD) provides improved equilibrium vibrational and rotational constants for the ground state of YH and YD. The excited C3Σ+C {^{3}\Sigma}^{+} state is involved in several perturbations
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