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A graphical representation based on duplication is developed that is suitable for the study of Ising systems in external fields. Two independent replicas of the Ising system in the same field are treated as a single four-state (Ashkin-Teller) model. Bonds in the graphical representation connect the Ashkin-Teller spins. For ferromagnetic systems it is proved that ordering is characterized by per...

Competing Jahn-Teller distortions combined with geometrical frustration give rise to a rich phase diagram as a function of x(Cu) and temperature in the spinel system Ni1xCuxCr2O4. The Jahn-Teller distortion of the end members acts in opposite ways with an elongation of the NiO4 tetrahedra resulting in a structural transition at TS1 = 317 K in NiCr2O4, but a flattening in the CuO4 tetrahedra at...

We present insights into the electronic structure and relaxation of N-V color centers in diamond which support the contention that Jahn-Teller effects may play a very significant role in the excited E state. We also consider several opposing arguments, but show that the unusual relaxation behavior of the N-V center can mask common signatures of the Jahn-Teller effect, and that it remains a stro...

Alkali-doped fullerides show a wide range of electronic phases in function of alkali atoms and the degree of doping. Although the presence of strong electron correlations is well established, recent investigations also give evidence for dynamical Jahn-Teller instability in the insulating and the metallic trivalent fullerides. In this work, to reveal the interplay of these interactions in fuller...

Using first-principles density-functional calculations, we explore the possibility of magnetic order at the rebonded DB step of the Si(001) surface. The rebonded DB step containing threefold coordinated Si atoms can be treated as a one-dimensional dangling-bond (DB) wire along the step edge. We find that Si atoms composing the step edge are displaced up and down alternatively due to Jahn-Teller...

In this project, a real-time embedded finger-vein recognition system for authentication on teller machine being developed. This system is implemented on an embedded platform and equipped with a novel finger-vein recognition algorithm, so this system is an intelligent security system. Based on this a teller machine concept is developed. Wherein, the transaction is successful, If and only if the ...

A band system ofjet-cooled Au, has been located in the near infrared region of the spectrum using resonant two-photon ionization spectroscopy. The origin band is located at 13 354.15 cm-’ and the system extends more than 700 cm ~’ further to the blue. The excited state displays a radiative lifetime of approximately 28 ps, corresponding to an absorption oscillator strength offzO.0003. Accordingl...

The interaction of coexisting structural instabilities in multiferroic materials gives rise to intriguing coupling phenomena and extraordinarily rich phase diagrams, both in bulk materials and strained thin films. Here we investigate the multiferroic BiMnO3 with its peculiar 6s2 electrons and four interacting mechanisms: electric polarity, octahedra tilts, magnetism, and cooperative Jahn-Teller...