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- 1. Appl. Phys. Lett. 90, 032102 (2007) , “Dynamic nuclear polarization induced by hot electrons”, Yosuke Komori and Tohru OkamotoA method for local dynamic nuclear polarization is demonstrated in a GaAs/AlGaAs heterostructure at the Landau level filling factor ν=3. Using a narrow channel sample, where the width varies stepwise along the electron flow, the authors find that electron cooling (heating) causes the polarization... (Read more)
- 2. Phys. Rev. B 75, 195207 (2007) , “Effects of optical absorption on 71Ga optically polarized NMR in semi-insulating GaAs: Measurements and simulations”, Stacy Mui, Kannan Ramaswamy, and Sophia E. HayesThe intensity and the hyperfine shift of optically polarized NMR (OPNMR) signals of 71Ga in semi-insulating GaAs have been found to depend on the photon energy and the helicity of light used for optical pumping. Single-crystal GaAs wafers of two different thicknesses, 400 and 175 ... (Read more)
- 3. Phys. Rev. B 75, 144101 (2007) , “NMR studies of metallic tin confined within porous matrices”, E. V. Charnaya, Cheng Tien, M. K. Lee, and Yu. A. Kumzerov119Sn NMR studies were carried out for metallic tin confined within synthetic opal and porous glass. Tin was embedded into nanoporous matrices in the melted state under pressure. The Knight shift for liquid confined tin was found to decrease with decreasing pore size. Correlations between... (Read more)
- 4. Phys. Rev. B 75, 115111 (2007) , “Spin dynamics in a weakly itinerant magnet from 29Si NMR in MnSi”, M. Corti, F. Carbone, M. Filibian, Th. Jarlborg, A. A. Nugroho, and P. Carretta29Si NMR spectra and nuclear spin-lattice relaxation rate measurements in MnSi paramagnetic phase are presented. The experimental results are analyzed in the framework of the self-consistent renormalization theory for spin fluctuations, and detailed estimates of microscopic parameters... (Read more)
- 5. Phys. Rev. B 75, 033301 (2007) , “Microscopic evidence for evolution of superconductivity by effective carrier doping in boron-doped diamond: 11B-NMR study”, H. Mukuda, T. Tsuchida, A. Harada, Y. Kitaoka, T. Takenouchi, Y. Takano, M. Nagao, I. Sakaguchi, T. Oguchi, and H. KawaradaWe have investigated the superconductivity discovered in boron-doped diamonds by means of 11B-NMR on heteroepitaxially grown (111) and (100) films. 11B-NMR spectra for all of the films are identified to arise from the substitutional B(1) site as single occupation and lower... (Read more)
- 6. Phys. Rev. Lett. 98, 220501 (2007) , “Efficient Dynamic Nuclear Polarization at High Magnetic Fields”, Gavin W. Morley, Johan van Tol, Arzhang Ardavan, Kyriakos Porfyrakis, Jinying Zhang, and G. Andrew D. BriggsBy applying a new technique for dynamic nuclear polarization involving simultaneous excitation of electronic and nuclear transitions, we have enhanced the nuclear polarization of the nitrogen nuclei in 15N@C60 by a factor of 103 at a fixed temperature of 3 K and a... (Read more)
- 7. Phys. Rev. B 74, 184108 (2006) , “Interpreting Mössbauer spectra reflecting an infinite number of sites: An application to Fe1−xSi synthesized by pulsed laser annealing”, A. Falepin, S. Cottenier, C. M. Comrie, and A. VantommeWe present a study on the interpretation of conversion electron Mössbauer spectra reflecting an infinite number of sites, in casu Mössbauer spectroscopy on Fe1−xSi layers on Si, synthesized by pulsed laser annealing. These spectra display a broad... (Read more)
- 8. Phys. Rev. B 74, 174206 (2006) , “Nuclear quadrupole resonance study of local bonding in glassy AsxSe1−x”, Eungho Ahn, G. A. Williams, and P. C. TaylorNuclear quadrupole resonance (NQR) experiments were performed on glassy AsxSe1−x to study the local structural order. The bonding in AsxSe1−x is governed by preferential bonding (chemical ordering) between arsenic... (Read more)
- 9. Phys. Rev. B 74, 161203(R) (2006) , “Room-temperature manipulation and decoherence of a single spin in diamond”, R. Hanson, O. Gywat, and D. D. AwschalomWe report on room-temperature coherent manipulation of the spin of a single nitrogen-vacancy center in diamond and a study of its coherence as a function of magnetic field. We use magnetic resonance to induce Rabi nutations and apply a Hahn spin echo to remove the effect of low-frequency dephasing.... (Read more)
- 10. Phys. Rev. B 74, 153201 (2006) , “Light-induced hyperfine 69Ga shifts in semi-insulating GaAs observed by optically polarized NMR”, Kannan Ramaswamy, Stacy Mui, and Sophia E. HayesWe report the observation of 69Ga NMR light induced hyperfine shifts at 6 K in semi-insulating GaAs detected by optically polarized nuclear magnetic resonance in a magnetic field of 4.7 T. The main features of the observed shift are a systematic change in the absolute shift value as the... (Read more)
- 11. Phys. Rev. B 74, 134303 (2006) , “1H NMR study of proton dynamics in Cs5H3(SO4)4·xH2O”, Koh-ichi Suzuki and Shigenobu HayashiComplicated phase relations in Cs5H3(SO4)4·xH2O are revealed by thermal analyses. A superprotonic phase transition takes place at 420 K for both the hydrated and the anhydrous forms. The 1H magic-angle-spinning (MAS) NMR... (Read more)
- 12. Phys. Rev. B 73, 121306 (2006) , “Resistively detected NMR in a two-dimensional electron system near mu = 1: Clues to the origin of the dispersive lineshape”, L. A. Tracy, J. P. Eisenstein, L. N. Pfeiffer, and K. W. WestResistively detected nuclear magnetic resonance (NMR) measurements on 2D electron systems near the =1 quantum Hall state are reported. In contrast to recent results of Gervais et al. [Phys. Rev. Lett. 94, 196803 (2005)], a dispersive line shape is found at all radio-frequency powers studied... (Read more)
- 13. J. Chem. Phys. 21, 1688-1694 (1953) , “Dissociation, Chemical Exchange, and the Proton Magnetic Resonance in Some Aqueous Electrolytes”, H. S. Gutowsky and A. SaikaThe position of the proton magnetic resonance is concentration dependent in aqueous solutions of electrolytes yielding hydrogen containing ions. Chemical exchange averages the chemical shifts in the proton resonance position over the different chemical species. The averaged shifts observed are... (Read more)
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