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- 1. J. Cryst. Growth 264, 1-6 (2004) , “Ammonolysis of Ga2O3 and its application to the sublimation source for the growth of GaN film”, Y. J. Park , C. S. Oh , T. H. Yeom, Y. M. YuWe have observed the nagnetic resonance of conduction electrons in n-type indium antimonide, by the "heating" of the electron kinetic-energy temperature via the slsctron spins. This is the first direct evidence suggesting a contribution of spin-orbit coupling to relaxation in this system. In a steady-state spin-resonance experiment, a power PS=(M0=MZ)H/T1 is transferred to the systems(reservoirs) towards which the spins relax. Here, M0 is the equilibrium magnetization, MZ the component of the magnetization along the magnetic field H, and T1 the relaxation time. The reservoir of interest in our case is the kinetic energy of the eledtrons, and this is detected by an increase in the mobility μ. To our knowledge. this is the first observation of the power flow, due to relaxation, from the spins to a reservoir,applied to the ditection of magnetic resonance of conduction-electron spins. It differs in principle from usual spin-resonance observation methods, which are based on electromagnetic interactions of the spin system, such as the voltage induced in a resonator by the rotating magnetic moment, or again such as power absorption PS=MyHx from the rotating field Hx by the out-of- phase component My.Besides providing information on the relaxation mechanism, the present method (that we call "ralaxation" method) should also in some cases by much more sensitive than the usual "electromagnetic" detection methods. (Read more)
- 2. J. Appl. Phys. 102, 103514 (2007) , AIP , “Characterization of defects in ZnO nanocrystals: Photoluminescence and positron annihilation spectroscopic studies”, A. K. Mishra, S. K. Chaudhuri, S. Mukherjee, A. Priyam, A. Saha, and D. DasDefects present in ZnO nanocrystals prepared by a wet chemical method have been characterized by photoluminescence (PL) and positron annihilation spectroscopy (PAS) techniques. The as-prepared sample was heat treated at different temperatures to obtain nanocrystals in the size range of 19–39 ... (Read more)
- 3. Appl. Phys. Lett. 84, 2635 (2004) , “Visible photoluminescence in ZnO tetrapod and multipod structures”, Aleksandra B. Djurisic, Yu Hang Leung, Wallace C. H. Choy, Kok Wai Cheah, Wai Kin ChanThe properties of ZnO tetrapod and multipod structures were investigated using scanning electron microscopy, x-ray diffraction, photoluminescence (PL), and electron paramagnetic resonance (EPR) spectroscopy. While there is relationship between g = 1.96 EPR and green PL in some of the samples,... (Read more)
- 4. Appl. Phys. Lett. 85, 1601 (2004) , “Different origins of visible luminescence in ZnO nanostructures fabricated by the chemical and evaporation methods”, D. Li, Y. H. Leung, A. B. Djurisic, Z. T. Liu, M. H. Xie, S. L. Shi, S. J. Xu, W. K. ChanWe prepared ZnO nanostructures using chemical and thermal evaporation methods. The properties of the fabricated nanostructures were studied using scanning electron microscopy, x-ray diffraction, photoluminescence, and electron paramagnetic resonance (EPR) spectroscopy. It was found that the... (Read more)
- 5. Thin Solid Films 496, 169-173 (2006) , “Green luminescence from Mn ions in ZnO–GeO2 glasses prepared by sol–gel method and their glass ceramics”, Tomoe Sanada, Kazuhiro Yamamoto, Noriyuki Wada , Kazuo KojimaZn2SiO4:Mn2+ is one of the green light luminants used for cathode ray tubes of televisions. Recently, optical materials emitting strong visible light under lower energy excitation have been expected. To obtain new luminants of high quality, we prepared Mn ion doped ZnO–GeO2 glasses and glass... (Read more)
- 6. Phys. Rev. B 64, 115308 (2001) , “Experimental Investigation of Band Structure Modification in Silicon Nanocrystals”, B. J. Pawlak, T. Gregorkiewicz, C. A. J. Ammerlaan, W. Takkenberg, F. D. Tichelaar, P. F. A. Alkemade.Experimental studies of size-related effects in silicon nanocrystals are reported. We present investigations carried out on nanocrystals prepared from single-crystal Si:P wafer by ball milling. The average final grain dimension varied depending on the way of preparation in the range between 70 and... (Read more)
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