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We measured the complex conductivity at the frequencies from 0.2 THz to 1.0 THz in the under-doped Pb1−ySr2Y1−xCaxCu2+yO7+δ (Pb1212) epitaxial film with terahertz time-domain specteroscopy. By analyzing temperature and frequency dependence of the complex conductivity, we found that the superconducting fluctuation persists up to 12 K above Tc, onset. Compared with previous reports, the superconducting...
Effects of growth conditions on structural and magnetic properties in Gd‐doped GaN layers grown by plasma‐assisted molecular beam epitaxy have been investigated. It is found that the growth of Gd‐doped GaN layers with atomically flat surface morphologies requires relatively high Ga fluxes compared with the growth of GaN. For these Gd‐doped GaN layers grown under Ga‐rich conditions, (0002) diffraction...
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