Zobrazeno 1 - 10
of 243
pro vyhledávání: '"Gehring, G A"'
We have investigated the volume collapse occurring in LaMnO3 unit cell using the anisotropic Potts model modified by two types of anisotropic interactions which has been used to study the change of Mn-O bonds lengths as function of temperature. The b
Externí odkaz:
http://arxiv.org/abs/1312.0131
Autor:
Whittaker, D. M., Gehring, G. A.
A method is presented for modelling the optical properties of a photonic crystal structure mounted on a substrate which is thick enough that the light reflected from the back is incoherent with reflections from the front. Transmission and reflection
Externí odkaz:
http://arxiv.org/abs/1012.3677
Autor:
Qahtani, Mohammed S. Al, Alshammari, Marzook, Blythe, H. J, Fox, A. M., Gehring, G. A., Andreev, N., Chichkov, V., Mukovskii, Ya
The effects of strain on a film of mulitferroic GdMnO3 are investigated using both magnetometry and magneto-optic spectroscopy. Optical spectra, in the energy range 1.5eV - 3.5eV, were taken in Faraday geometry in an applied magnetic field and also a
Externí odkaz:
http://arxiv.org/abs/1011.4174
Room temperature ferromagnetism was observed in n-type Fe-doped In2O3 thin films deposited on c-cut sapphire substrates by pulsed laser deposition. Structure, magnetism, composition, and transport studies indicated that Fe occupied the In sites of th
Externí odkaz:
http://arxiv.org/abs/0905.2083
Magneto optic measurements are a very powerful tool for investigating the polarization of a conduction band as a function of temperature and are used here to study the polarization of the mobile electrons in 50nm LSMO (x=0.3) strained thin films grow
Externí odkaz:
http://arxiv.org/abs/0810.4104
Autor:
Gehring, G. A.
A quantum critical point is approached by applying pressure in a number of magnetic metals. The observed dependence of Tc on pressure necessarily means that the magnetic energy is coupled to the lattice. A first order phase transition occurs if this
Externí odkaz:
http://arxiv.org/abs/0711.2586
Autor:
Behan, A. J., Mokhtari, A., Blythe, H. J., Score, D., Xu, X-H., Neal, J. R., Fox, A. M., Gehring, G. A.
Films of ZnO doped with magnetic ions, Mn and Co and, in some cases, with Al have been fabricated with a very wide range of carrier densities. Ferromagnetic behaviour is observed in both insulating and metallic films, but not when the carrier density
Externí odkaz:
http://arxiv.org/abs/0711.0172
Autor:
Ahmed, Mahrous R., Gehring, G. A.
The optical properties of a small magnetic cluster are studied in a magnetic version of Frank-Condon principle. This simple model is considered to show new basic physics and could be adopted to treat real problems. The energies and wavefunctions of t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608675
Autor:
Ahmed, Mahrous R., Gehring, G. A.
The Jahn-Teller distortive transition of \lmo is described by a modified 3-state Potts model. The interactions between the three possible orbits depends both on the orbits and their relative orientation on the lattice. Values of the two exchange para
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606017
We report on first principles calculations of the electronic structure of La$_{0.7}$Sr$_{0.3}$MnO$_{3}$/SrTiO$_{3}$ junction with two possible types of interface terminations. We find that the La$_{0.7}$Sr$_{0.3}$O/TiO$_{2}$ interface preserves the i
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604343