Now showing items 1-10 of 3462
Structural, electronic, and magnetic entropy contributions of the orbital order-disorder transition in LaMnO(3)
(TAYLOR & FRANCIS LTD, 2011)
Measurements of X-ray diffraction, electrical resistivity, and magnetization are reported across the Jahn-Teller phase transition in LaMnO(3). Using a thermodynamic equation, we obtained the pressure derivative of the ...
Insulator-to-metal transition driven by clustering of solitons in polyacetylene
It's believed that the simple Su-Schrieffer-Heeger Hamiltonian can not predict the insulator to metal transition of transpolyacetylene (t-PA). The soliton lattice configuration at a doping level y=6% still has a semiconductor ...
Metal-insulator transitions in pressed pellets of BF4 - doped poly(3-methylthiophene)
From Electron Spin Resonance (ESR) data in pressed pellets of BF4 - doped Poly(3-methylthiophene) (P3MT) we obtained simultaneously the paramagnetic susceptibility and. the microwave conductivity. We observed a transition ...
Evidence for internal field in graphite: a conduction electron spin-resonance study
(Pergamon-elsevier Science LtdOxfordInglaterra, 2002)
A thermodynamic model for the simultaneous charge/spin order transition in LaCu3Fe4O12
(IOP Publishing, 2012-11)
LaCu3Fe4O12 undergoes a phase transition at 393 K from an antiferromagnetic insulating state at low temperatures to a paramagnetic metallic state above the critical temperature. We build a basic model for the electronic ...
Asymmetry between the electron- and hole-doped Mott transition in the periodic Anderson model
(American Physical Society, 2009-01)
We study the doping-driven Mott metal-insulator transition (MIT) in the periodic Anderson model set in the Mott-Hubbard regime. A striking asymmetry for electron- or hole-driven transitions is found. The electron-doped MIT ...
Optical transition probabilities and compositional dependence of Judd-Ofelt parameters of Er3+ ions in fluoroindate glass
Fluoroindate glasses containing 1, 2, 3, and 4 mol% ErF3 were prepared in a dry box under an argon atmosphere. Absorption spectra of these glasses at room temperature were obtained. The Judd-Ofelt parameters Ωλ (λ = 2, 4, ...