Zobrazeno 1 - 10
of 825
pro vyhledávání: '"Syassen, K."'
Publikováno v:
Phys. Rev. B 93, 224109 (2016)
Pressure-induced transitions from ordered intermetallic phases to substitutional alloys to semi-ordered phases were studied in a series of bismuth tellurides. Using angle-dispersive x-ray diffraction, the compounds Bi4Te5, BiTe, and Bi2Te were observ
Externí odkaz:
http://arxiv.org/abs/1606.02495
Autor:
Zabaleta, J., Borisov, V. S., Wanke, R., Jeschke, H. O., Parks, S. C., Baum, B., Teker, A., Harada, T., Syassen, K., Kopp, T., Pavlenko, N., Valentí, R., Mannhart, J.
Two-dimensional electron systems with fascinating properties exist in multilayers of standard semiconductors, on helium surfaces, and in oxides. Compared to the two-dimensional (2D) electron gases of semiconductors, the 2D electron systems in oxides
Externí odkaz:
http://arxiv.org/abs/1605.08528
Publikováno v:
Phys. Rev. B 90, 140501 (2014)
We investigate the pressure and temperature dependence of the lattice dynamics of the underdoped, stoichiometric, high temperature superconductor YBa2Cu4O8 by means of Raman spectroscopy and ab initio calculations. This system undergoes a reversible
Externí odkaz:
http://arxiv.org/abs/1409.5547
Publikováno v:
Phys. Rev. Lett. 107, 086402 (2011)
We have measured plasmon energies in Na under high pressure up to 43 GPa using inelastic x-ray scattering (IXS). The momentum-resolved results show clear deviations, growing with increasing pressure, from the predictions for a nearly-free electron me
Externí odkaz:
http://arxiv.org/abs/1104.3486
Autor:
Forthaus, M. K., Sengupta, K., Heyer, O., Christensen, N. E., Svane, A., Syassen, K., Khomskii, D. I., Lorenz, T., Abd-Elmeguid, M. M.
Publikováno v:
Phys. Rev. Lett. 105, 157001 (2010)
We found that under pressure SnO with alpha-PbO structure, the same structure as in many Fe-based superconductors, e.g. beta-FeSe, undergoes a transition to a superconducting state for p > 6 GPa with a maximum Tc of 1.4 K at p = 9.3 GPa. The pressure
Externí odkaz:
http://arxiv.org/abs/1009.3787
The effect of pressure on the zone-center optical phonon modes of antimony in the A7 structure has been investigated by Raman spectroscopy. The A_g and E_g frequencies exhibit a pronounced softening with increasing pressure, the effect being related
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608676
Publikováno v:
Phys. Rev. B 74, 054105 (2006)
The pressure-induced changes in the optical properties of the quasi-one-dimensional conductor LaTiO$_{3.41}$ were studied by polarization-dependent mid-infrared micro-spectroscopy at room temperature. For the polarization of the incident radiation pa
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606607
Publikováno v:
J. Phys.: Condens. Matter 19, 406223 (2007)
We investigate the crystal structure of YTiO3 at high pressures up to 30 GPa by synchrotron x-ray powder diffraction (T = 295 K). The variation of the Ti--O bond lengths with pressure evidences a distinct change in the distortion of the TiO_6 octahed
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504383
Publikováno v:
Phys. Rev. Lett. 93, 126403 (2004)
Electronic conduction in GaM$_{4}$Se$_{8}$ (M=Nb;Ta) compounds with the fcc GaMo$_{4}$S$_{8}$-type structure originates from hopping of localized unpaired electrons (S=1/2) among widely separated tetrahedral M$_{4}$ metal clusters. We show that under
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504284
The effect of pressure on the structural properties of lanthanum sesquicarbide La2C3 (T_c = 13 K) has been investigated at room temperature by angle-dispersive powder x-ray diffraction in a diamond anvil cell. The compound remains in the cubic Pu2C3-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503597