12 research outputs found
Interplay of magnetic order and Jahn-Teller distortion in a model with strongly correlated electron system
The Hubbard model has been employed successfully to understand many aspects
of correlation driven physical properties, in particular, the magnetic order in
itenerant electron systems. In some systems such as Heusler alloys, manganites
etc., it is known that, in addition to magnetic order, distortion induced by
Jahn-Teller(J-T) effect also exists. In this paper, based on two-fold
degenerate Hubbard model, the influence of magnetic order on J-T distortion is
investigated. The electron correlation is treated using a spectral density
approach and J-T interaction is added to the model. We find that magnetic order
and structural distortion coexist at low temperature for a certain range of
electron correlation strength , J-T coupling strength and band
occupation . At T=0, for a given and , magnetic order is present but
distortion appears only for a larger than a critical value. We also studied
the temperature dependence of lattice strain and magnetization choosing a
close to the critical value.Comment: 12 pages, 5 Figures. Physica- B 405 1701-1705 (2010
Der Arbeitskreis "Gender Mainstreaming" in der DeGEval - Gesellschaft für Evaluation stellt sich vor
Inclusive measurements of the break-up of 156 MeV 6Li-ions at extreme forward angles and the quasi free break-up model
Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
The Hall effect, resistivity and magnetic moment of amorphous and polycrystalline iron films
Sensitive and high throughput metabolite assays for inorganic pyrophosphate, ADPGlc, nucleotide phosphates, and glycolytic intermediates based on a novel enzymic cycling system.
Metabolite assays are required to characterise how metabolism changes between genotypes during development and in response to environmental perturbations. They provide a springboard to identify important regulatory sites and investigate the underlying mechanisms. Due to their small size, Arabidopsis seeds pose a technical challenge for such measurements. A set of assays based on a novel enzymic cycling system between glycerol-3-phosphate dehydrogenase and glycerol-3-phosphate oxidase have been developed and optimised for use with growing Arabidopsis seeds. In combination with existing assays they provide a suite of high throughput, sensitive assays for the immediate precursors for starch (adenine diphosphate glucose) and lipid (acetyl coenzyme A, glycerol-3-phosphate) synthesis, as well as pyrophosphate, ATP, ADP and most of the glycolytic intermediates. A method is also presented to rapidly quench intact siliques, lyophilise them and then manually separate seeds for metabolite analysis. These techniques are used to investigate changes in overall seed metabolite levels during development and maturation, and in response to a stepwise decrease of the external oxygen concentration