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47 papers · 1 filter
Anisotropic phonon DOS: the application of Rietveld and Mossbauer texture analysis in aligned powders
A. I. Rykov, M. Seto, Y. Ueda +1
While synthesizing the single crystals of novel materials is not always feasible, orienting the layered polycrystals becomes an attractive method in the studies of angular dependen…
Vibrational abisotropy and quadrupole interactions of Fe substituted into Mn site of the charge and orbitally ordered and disordered layered manganites LnBaMn1.96Fe0.04O5 and LnBaMn1.96Fe0.04O6 (Ln=Y,Gd,Sm,La)
A. I. Rykov, Y. Ueda, K. Nomura +1
A-site ordered manganites LnBaMn1.96Fe0.04O5 and LnBaMn1.96Fe0.04O6 are investigated by x-ray full-profile diffraction and Moessbauer spectroscopy. Powder samples were oriented wit…
Domain boundary formation in helical multishell gold nanowire
Takeo Hoshi, Takeo Fujiwara
Helical multishell gold nanowire is studied theoretically for the formation mechanism of helical domain boundary. Nanowires with the wire length of more than 10 nm are relaxed by q…
Existence of an upper limit on the density of excitons in carbon nanotubes by diffusion-limited exciton-exciton annihilation: Experiment and theory
Yoichi Murakami, Junichiro Kono
Through an investigation of photoemission properties of highly-photoexcited single-walled carbon nanotubes, we demonstrate that there is an upper limit on the achievable excitonic…
Environmental Effect on the UV Optical Absorption of Single-Walled Carbon Nanotubes
Yoichi Murakami, Shigeo Maruyama
We studied optical absorption of single-walled carbon nanotubes by varying the dielectric environment. For the two different components of the broad UV absorption feature conventio…
Photoluminescence sidebands of carbon nanotubes below the bright singlet excitonic levels: Coupling between dark excitons and K-point phonons
Yoichi Murakami, Benjamin Lu, Said Kazaoui +3
We performed detailed photoluminescence (PL) spectroscopy studies of three different types of single-walled carbon nanotubes (SWNTs) by using samples that contain essentially only…