نتایج جستجو برای: teller effect
تعداد نتایج: 1644869 فیلتر نتایج به سال:
1550-7998=20 The O QED and electroweak radiative corrections to neutrino-deuteron reactions is investigated with particular emphasis given to the constant terms, which have not been treated properly in the literature. This problem is related to the definition of the axial-vector coupling constant gA as to the inclusion of radiative corrections. After proper calculations of the constants for the...
M. Karakoç,1,2 R. G. T. Zegers,3,4,5,* B. A. Brown,3,4,5 Y. Fujita,6,7 T. Adachi,6 I. Boztosun,1,2 H. Fujita,6 M. Csatlós,8 J. M. Deaven,3,4,5,† C. J. Guess,3,4,5,‡ J. Gulyás,8 K. Hatanaka,6 K. Hirota,6 D. Ishikawa,6 A. Krasznahorkay,8 H. Matsubara,6,§ R. Meharchand,3,4,5,‖ F. Molina,9,¶ H. Okamura,6,** H. J. Ong,6 G. Perdikakis,3,4,5,†† C. Scholl,10,‡‡ Y. Shimbara,11,§§ G. Susoy,12 T. Suzuki,6...
Using the coupled cluster method ~CCM!, we present a simple accurate calculation for the energies of the groundand first excited states of the linear E ^ e Jahn–Teller and pseudo-Jahn–Teller Hamiltonians. From the solution of a single transcendental equation, we obtain results with a maximal error of 1.2%. These results are notably better than previous results obtained both via the CCM and othe...
Ab initio studies of the stability of orbital ordering, its coupling to magnetic structure and its possible origins ~electron-phonon and/or electron-electron interactions! are reported for two perovskite systems, LaMnO3 and KCuF3. We present an average spin state calculational scheme that allowed us to treat a paramagnetic state and to succesfully describe the experimental magnetic or orbital p...
We present an analytical calculation of the spin-wave spectrum of the Jahn-Teller system LaTiO3. The calculation includes all superexchange couplings between nearest-neighbor Ti ions allowed by the spacegroup symmetries: The isotropic Heisenberg couplings and the antisymmetric (Dzyaloshinskii-Moriya) and symmetric anisotropies. The calculated spin-wave dispersion has four branches, two nearly d...
PT (= parity times time-reversal) symmetry of complex Hamiltonians with real spectra is usually interpreted as a weaker mathematical substitute for Hermiticity. Perhaps an equally important role is played by the related strengthened analyticity assumptions. In a constructive illustration we complexify a few potentials solvable only in s−wave. Then we continue their domain from semi-axis to the ...
GT transitions in N = 28 ∼ 30 nuclei are studied in terms of a large-scale realistic shell-model calculation, by using Towner's microscopic parameters. B(GT) values to low-lying final states are reproduced with a reasonable accuracy. Several gross properties with respect to the GT transitions are investigated with this set of the wavefunctions and the operator. While the calculated total GT − s...
To expand our knowledge of electronic structures and magnetic properties for ferromagnetic shape memory Co-Ni-Al alloys, which undergo a thermoelastic martensitic transformation from a B2 to an L10 structure, we have performed first-principles band calculations for the composition of Co:Ni:Al = 1:1:1, i.e., (Co1=3Ni2=3)(Co1=3Al2=3) and (Ni1=3Co2=3)(Ni1=3Al2=3). Their electronic structures have ...
The binary compound SnSe exhibits record high thermoelectric performance, largely because of its very low thermal conductivity. The origin of the strong phonon anharmonicity leading to the low thermal conductivity of SnSe is investigated through first-principles calculations of the electronic structure and phonons. It is shown that a Jahn-Teller instability of the electronic structure is respon...
The infrared reflectivity of a La0.67Ca0.33MnO3 single crystal is studied over a broad range of temperatures ~78–340 K!, magnetic fields ~0–16 T!, and wave numbers (20– 9000 cm). The optical conductivity gradually changes from a Drude-like behavior to a broad peak feature near 5000 cm in the ferromagnetic state below the Curie temperature TC5307 K. Various features of the optical conductivity b...
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