Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Viciu, L."'
Publikováno v:
Phys. Rev. B 77, 075119 (2008)
The magnetic properties and structure of LixCoO2 for x between 0.5 and 1.0 are reported. Co4+ is found to be high-spin in LixCoO2 for x between 0.94 and 1.0 and low-spin for x between 0.50 and 0.78. Weak antiferromagnetic coupling is observed, increa
Externí odkaz:
http://arxiv.org/abs/0710.3767
Autor:
Qian, D., Wray, L., Hsieh, D., Viciu, L., Cava, R. J., Luo, J. L., Wu, D., Wang, N. L., Hasan, M. Z.
Publikováno v:
Phys. Rev. Lett. 97, 186405 (2006)
We utilize fine-tuned polarization selection coupled with excitation-energy variation of photoelectron signal to image the \textit{complete d}-band dispersion relation in sodium cobaltates. A hybridization gap anticrossing is observed along the Brill
Externí odkaz:
http://arxiv.org/abs/cond-mat/0611621
Structure and basic magnetic properties of the honeycomb lattice compounds Na2Co2TeO6 and Na3Co2SbO6
Autor:
Viciu, L., Huang, Q., Morosan, E., Zandbergen, H. W., Greenbaum, N. I., McQueen, T., Cava, R. J.
The synthesis, structure, and basic magnetic properties of Na2Co2TeO6 and Na3Co2SbO6 are reported. The crystal structures were determined by neutron powder diffraction. Na2Co2TeO6 has a two-layer hexagonal structure (space group P6322) while Na3Co2Sb
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609670
Autor:
Qian, D., Hsieh, D., Wray, L., Fedorov, A., Wu, D., Luo, J. L., Wang, N. L., Viciu, L., Cava, R. J., Hasan, M. Z.
Publikováno v:
Phys. Rev. Lett. 96, 216405 (2006)
We report a state-of-the-art photoemission (ARPES) study of high quality single crystals of the NaxCoO2 series focusing on the fine details of the low-energy states. The Fermi velocity is found to be small (< 0.5 eV.A) and only weakly anisotropic ove
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605547
Autor:
Qian, D., Wray, L., Hsieh, D., Wu, D., Luo, L. J., Wang, N. L., Fedorov, A., Cava, R. J., Viciu, L., Hasan, M. Z.
Publikováno v:
Phys. Rev. Lett. 96, 046407 (2006)
Layered cobaltates embody novel realizations of correlated quantum matter on a spin-1/2 triangular lattice. We report a high-resolution systematic photoemission study of the insulating cobaltates (Na1/2CoO2 and K1/2CoO2). Observation of single-partic
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605352
The crystal structure and oxygen stoichiometry in two-layer Na0.74CoO2 and Na0.38CoO2 at room temperature are analyzed by powder neutron diffraction. Two sets of diffraction data for each sample, taken at different incident neutron wavelengths, lambd
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603600
Autor:
Viciu, L., Bos, J. W. G., Zandbergen, H. W., Huang, Q., Foo, M. L., Ishiwata, S., Ramirez, A. P., Lee, M., Ong, N. P., Cava, R. J.
The crystal structures of the NaxCoO2 phases based on three-layer NaCoO2, with x=0.32, x=0.51, x=0.60, x=0.75 and x=0.92, determined by powder neutron diffraction, are reported. The structures have triangular CoO2 layers interleaved by sodium ions, a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0601587
Autor:
Klimczuk, T., Zandbergen, H. W., van der Pers, N. M., Viciu, L., Miller, V. L., Lee, M. -H., Cava, R. J.
Publikováno v:
Materials Research Bulletin vol. 41 (2006) 1673-1680
The high pressure synthesis, structure and magnetic properties of Ca_25Co_22O_56(OH)_28 are reported. The compound has a misfit structure, consisting of double, square calcium oxide hydroxide rock-salt-like layers between hexagonal CoO_2 layers. The
Externí odkaz:
http://arxiv.org/abs/cond-mat/0510137
Publikováno v:
In Physica B: Physics of Condensed Matter 2008 403(5):1007-1009
Publikováno v:
In Journal of Physics and Chemistry of Solids 2008 69(12):2986-2988