نتایج جستجو برای: pseudo jahn teller effect pjte
تعداد نتایج: 1689666 فیلتر نتایج به سال:
Understanding the relationship between the superconducting, the neighboring insulating, and the normal metallic state above T c is a major challenge for all unconventional superconductors. The molecular A3C60 fulleride superconductors have a parent antiferromagnetic insulator in common with the atom-based cuprates, but here, the C60 (3-) electronic structure controls the geometry and spin state...
In a two orbital double exchange model we formulate Jahn-Teller coupled charge density wave in half-filled limit. Softening of Jahn-Teller phonons corresponding to distortion modes Q2 or Q3 associated with perfect nesting of Fermi surface leads to this instability at low temperature. The gap equation for charge density wave state and its dependences on electron-lattice coupling are calculated e...
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 stability of the charge-stacked structure vis-à-vis the charge-alternate structure in the half-doped manganites is studied with a model that includes electronic kinetic energy, onsite and intersite Coulomb interactions, the Jahn–Teller energy, and the antiferromagnetic superexchange between the manganese core spins. It is shown that for a single zigzag chain, the electronic kinetic energy s...
The sensitivity of polarisation-asymmetry correlation experiments to charged currents of right-handed chirality contributing to allowed β-decay is considered in the most general context possible, independently of any type of approximation nor of any specific model for physics beyond the Standard Model of the electroweak interactions. Results are then particularised to general Left-Right Symmetr...
At forward angles, and bombarding energies E > 200 MeV, the (p, n) and (n, p) reactions are thought to be directly proportional to the Gamow-Teller transition strengths in the nuclei. Assuming that this relationship also holds for charge exchange induced by high-energy heavy ions, it would be very useful in studies with radioactive beams. Contrary to this expectation, we show that the determina...
2014 Recent experimental results obtained on A15 compounds allow a better understanding of the correlation between superconductivity and lattice instability in this system. The effect of the lattice distortion is shown to reduce the superconducting transition Tc. An enhancement of Tc in the case of V3Si is obtained when the temperature of the martensitic transition is lowered (by pressure or de...
A detailed model for the calculation of beta decay rates of the fp shell nuclei for situations prevailing in pre-supernova and collapse phases of evolution of the core of massive stars leading to supernova explosion has been extended for electron-capture rates. It can also be used to determine the half-lives of neutronrich nuclei in the fp/fpg shell. The model uses an averaged Gamow-Teller (GT)...
for an Invited Paper for the MAR07 Meeting of The American Physical Society Anti-Jahn-Teller effect and d-wave phonon mechanism in cuprates HIROSHI KAMIMURA, Tokyo University of Science Undoped cuprates are Jahn-Teller (JT) Materials [1] and Mott AF insulators [2]. When holes are doped, the octahedrons or pyramids elongated by the JT effect shrink. We call such distortion against the JT effect ...
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