scholarly journals Nonadiabatic effects in a generalized Jahn-Teller lattice model: Heavy and light polarons, pairing, and the metal-insulator transition

2002 ◽  
Vol 65 (17) ◽  
Author(s):  
Eva Majerníková ◽  
J. Riedel ◽  
S. Shpyrko
Keyword(s):  
Lattice Model ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Jahn Teller ◽  
Nonadiabatic Effects

scholarly journals EFFECT OF STRAIN ON THE TRANSPORT PROPERTIES OF THE MANGANITE

2001 ◽  
Vol 15 (27) ◽  
pp. 3551-3558 ◽  
Author(s):  
S. BASAK ◽  
I. CHAUDHURI ◽  
S. K. GHATAK
Keyword(s):  
Magnetic Field ◽  
Nearest Neighbor ◽  
Large Strain ◽  
Spin Correlation ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Increasing Function

The effect of strain on the resistivity and thermopower of ferromagnetic manganites has been examined based on the model that incorporates the electron-lattice interaction through the Jahn–Teller effect and an effective hopping determined by nearest neighbor spin–spin correlation of t2g electrons. The metal insulator transition temperature associated with resistivity decreases with increase in strain. In the presence of large strain the system remains in the semiconducting state. Thermopower (S) is positive and increasing function of strain and it exhibits a maximum with temperature. The temperature where maximum of S appears, shifts towards higher (lower) value in the presence of magnetic field (strain). A large magneto-thermopower that depends on strain is obtained around metal–insulator transition.

Changes in the Jahn-Teller distortion at the metal-insulator transition in CMR manganites

1999 ◽  
Vol 11 (1) ◽  
pp. 109-120 ◽  
Author(s):  
O Toulemonde ◽  
F Millange ◽  
F Studer ◽  
B Raveau ◽  
J-H Park ◽  
...  
Keyword(s):  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion

Fermi-surface reconstruction close to a pressure-induced metal-insulator transition

2004 ◽  
Vol 114 ◽  
pp. 277-281 ◽  
Author(s):  
J. Wosnitza ◽  
J. Hagel ◽  
O. Stockert ◽  
C. Pfleiderer ◽  
J. A. Schlueter ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Surface Reconstruction ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Fermi Surface Reconstruction
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