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S. Kondo,T. Nakanish,T. Saito,H. Nakagawa,H. Asada,K. Takahashi 한국물리학회 2007 Current Applied Physics Vol.7 No.1
Photoluminescence of microcrystalline CsPbBr3 lms grown from the amorphous phase shows stimulated emission not only at cryo-3 single crystals, where no stimulated emis-sion occurs even at 4.2 K. This is the rst demonstration of room temperature stimulated emission from metal halide compounds.The stimulated emission is so strong that single-path-light-amplication stimulated emission across the lm thickness is observed atrelatively low threshold excitation intensities of. 50 kW cm. 2 at 77 K and . 100 kW cm. 2 at 295 K suggesting a large optical gain. Theattributable to giant oscillator strength eect characteristic of excitonic superradiance recently reported in this issue.
Abe, K.,Hieda, K.,Hiraide, K.,Hirano, S.,Kishimoto, Y.,Kobayashi, K.,Moriyama, S.,Nakagawa, K.,Nakahata, M.,Ogawa, H.,Oka, N.,Sekiya, H.,Shinozaki, A.,Suzuki, Y.,Takeda, A.,Takachio, O.,Ueshima, K.,Um North-Holland Pub. Co 2013 Physics letters: B Vol.719 No.1
A search for light dark matter using low-threshold data from the single phase liquid xenon scintillation detector XMASS, has been conducted. Using the entire 835 kg inner volume as target, the analysis threshold can be lowered to 0.3 keVee (electron-equivalent) to search for light dark matter. With low-threshold data corresponding to a 5591.4 kg@?day exposure of the detector and without discriminating between nuclear-recoil and electronic events, XMASS excludes part of the parameter space favored by other experiments.
Matsuta, K.,Gandhi, P.,Dotani, T.,Nakagawa, T.,Isobe, N.,Ueda, Y.,Ichikawa, K.,Terashima, Y.,Oyabu, S.,Yamamura, I.,Stawarz, L. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We combine data from two all-sky surveys, the Swift/Burst Alert Telescope 22 Month Source Catalog and the AKARI Point Source Catalogue, in order to study the connection between the hard X-ray (> 10 keV) and infrared (IR) properties of local active galactic nuclei (AGN). We find two photometric diagnostics are useful for source classification: one is the X-ray luminosity vs. IR color diagram, in which type 1 radio-loud AGN are well isolated from other AGN. The second one uses the X-ray vs. IR color-color diagram as a redshift-independent indicator for identifying Compton-thick (CT) AGN. Importantly, CT AGN and starburst galaxies in composite systems can also be separated in this plane based upon their hard X-ray fluxes and dust temperatures. This diagram may be useful as a new indicator to classify objects in new surveys such as with WISE and NuSTAR.
Novel Anisotropic Superconductivity in Silicides
T. Tamegai,G. J. Li,K. Uozato,T. Nakagawa,Y. Nakajima 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
The discovery of superconductivity with Tc ∽39 K in MgB2 renewed our interest in intermetalic compounds containing light elements. We have revisited superconductivity in anisotropic silicides, such as CaMSi (M = Al and Ga), R5Ir4Si10 (R: rare-earth elements), and Lu2Fe3Si5. In CaAlSi with the AlB2 structure, an anomalous angular dependence of the upper critical field is found, sugesting the presence of a decoupled superconducting region. An X-ray diffraction study has shown the presence of a pronounced superlatice structure along thec-axis. Magneto-optical observations on the ac-plane of CaAlSi reveal the presence of strong inhomogeneities. Most R5Ir4Si10 (R: Sc, Y, rare-earth elements) compounds show a charge-density wave instability with the ex- ception of Sc5Ir4Si10, which shows the highest Tc among these compounds. We have compared their anisotropic superconductivity in order to get some insight into the exceptional properties of Sc5Ir4Si10. Lu2Fe3Si5 is a superconductor with Tc ∽ 6 K and containing nonmagnetic iron. Previous specific heat measurements show that Lu2Fe3Si5 has a large residual density of state in the superconducting state. We have sucesfuly grown high-quality single crystals of Lu2Fe3Si5 and found a signature of the presence of a second superconducting gap as in MgB2.