Pseudo-Jahn-Teller Effect and Second Order Phase Transitions in Crystals

1967 ◽  
Vol 21 (1) ◽  
pp. K39-K43 ◽  
Author(s):  
N. Kristoffel ◽  
P. Konsin
Keyword(s):  
Phase Transitions ◽  
Second Order ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

Phase diagrams of Ni2+xMn1-xGa Heusler alloys from Hubbard Hamiltonian with account of Jahn-Teller effect

2011 ◽  
Vol 1310 ◽  
Author(s):  
Mikhail A. Zagrebin ◽  
Vasiliy D. Buchelnikov ◽  
Sergey V. Taskaev ◽  
Natal’ya Yu. Fedulova
Keyword(s):  
Phase Diagram ◽  
Free Energy ◽  
Phase Transitions ◽  
Phase Diagrams ◽  
Density Of States ◽  
Heusler Alloys ◽  
Teller Effect ◽  
Hubbard Hamiltonian ◽  
Jahn Teller ◽  
Jahn Teller Effect

ABSTRACTIn this work a microscopic Hamiltonian is investigated using the Hubbard model for a ferromagnet with two degenerate bands, taking into account the Jahn-Teller effect. A macroscopic free energy is obtained from the microscopic Hubbard Hamiltonian. All free energy coefficients depend on microscopic parameters: temperature T and composition x. As a result of analytical minimization of free energy, phase diagrams are numerically constructed. It is shown that at certain values of parameters on the phase diagrams there are thermodynamic paths which correspond to experimentally observed sequences of phase transitions. Using density of states spectra for different compositions x the T-x phase diagram is numerically constructed. This phase diagram can theoretically explain experimentally observed behavior of the temperatures of phase transitions.

Terminal and Four-Coordinate Vanadium(IV) Phosphinidene Complexes. A Pseudo Jahn−Teller Effect of Second Order Stabilizing the V−P Multiple Bond

2004 ◽  
Vol 126 (7) ◽  
pp. 1924-1925 ◽  
Author(s):  
Falguni Basuli ◽  
Brad C. Bailey ◽  
John C. Huffman ◽  
Mu-Hyun Baik ◽  
Daniel J. Mindiola
Keyword(s):  
Multiple Bond ◽  
Second Order ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

Second-Order Jahn–Teller Effect in a Host–Guest Complex

2007 ◽  
Vol 119 (26) ◽  
pp. 5064-5066 ◽  
Author(s):  
Bryan E. F. Tiedemann ◽  
Kenneth N. Raymond
Keyword(s):  
Second Order ◽  
Teller Effect ◽  
Guest Complex ◽  
Host Guest Complex ◽  
Jahn Teller ◽  
Jahn Teller Effect

Second-order Jahn-Teller effect on carbon4N+2member ring clusters

1999 ◽  
Vol 60 (12) ◽  
pp. 8939-8942 ◽  
Author(s):  
Mineo Saito ◽  
Yasuharu Okamoto
Keyword(s):  
Second Order ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect

Second-order jahn-teller effect of cyclobutadiene in low-lying states. An MCSCF study

1989 ◽  
Vol 136 (1) ◽  
pp. 67-77 ◽  
Author(s):  
Kensuke Nakamura ◽  
Yoshihiro Osamura ◽  
Suehiro Iwata
Keyword(s):  
Second Order ◽  
Teller Effect ◽  
Jahn Teller ◽  
Jahn Teller Effect
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