Small-polaron theory of phonon-assisted defect tunneling with quadratic defect-lattice coupling

1979 ◽  
Vol 19 (2) ◽  
pp. 1136-1148 ◽  
Author(s):  
D. L. Tonks ◽  
B. G. Dick
Keyword(s):  
Small Polaron ◽  
Polaron Theory ◽  
Lattice Coupling

scholarly journals Muon diffusion and trapping in aluminum and dilute aluminum alloys: Experiments and comparison with small-polaron theory

1982 ◽  
Vol 26 (2) ◽  
pp. 567-590 ◽  
Author(s):  
K. W. Kehr ◽  
D. Richter ◽  
J. -M. Welter ◽  
O. Hartmann ◽  
E. Karlsson ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Small Polaron ◽  
Muon Diffusion ◽  
Polaron Theory

CHARGE CARRIER MASS IN HIGH Tc SUPERCONDUCTORS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3582-3584
Author(s):  
MARCO ZOLI
Keyword(s):  
Charge Carrier ◽  
Numerical Study ◽  
Small Polaron ◽  
Electron Mass ◽  
High Tc Superconductors ◽  
High Tc ◽  
Effective Masses ◽  
Polaron Theory ◽  
Holstein Model

The theory of polarons has experienced a surge of activity in the last years partly due to the possible role of polaronic quasiparticles in high Tc superconductors. This numerical study of the Holstein model shows that the polaronic effective masses become essentially dimension independent and of order ≃10–50 times the electron mass at sufficiently strong intermolecular coupling forces. Such values (which are much lower than those obtained by traditional small polaron theory) would erase one the serious objections against a (bi)polaronic picture for high Tc superconductors.

CARRIER–LATTICE RELAXATION FOR BROADENING EPR LINEWIDTH IN Nd0.55Sr0.45MnO3

2013 ◽  
Vol 27 (31) ◽  
pp. 1350232
Author(s):  
JIYU FAN ◽  
XIYUAN ZHANG ◽  
WEI TONG ◽  
LEI ZHANG ◽  
WEICHUN ZHANG ◽  
...  
Keyword(s):  
Experimental Data ◽  
Small Polaron ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Present System ◽  
Perovskite Manganite ◽  
Paramagnetic Resonance ◽  
Polaron Hopping ◽  
Lattice Coupling ◽  
Electron Paramagnetic

In this paper, we report the electron paramagnetic resonance (EPR) study of perovskite manganite Nd 0.55 Sr 0.45 MnO 3. Experimental data reveal that the EPR linewidth broadens with a quasilinear manner up to 480 K. The broadening of the EPR linewidth can be understood in terms of the shortening of carrier–lattice relaxation time due to the occurrence of strong carrier–phonon interactions. Two same activation energies obtained respectively from the temperature dependence of EPR intensity and resistivity indicate that the linewidth variation is correlated to the small polaron hopping. Therefore, the carrier–lattice coupling play a major role for deciding its magnetism in the present system.

Optical properties of lanthanumcobaltite explained by small polaron theory

1964 ◽  
Vol 8 (1) ◽  
pp. 29-30 ◽  
Author(s):  
H.G. Reik ◽  
E. Kauer ◽  
P. Gerthsen
Keyword(s):  
Optical Properties ◽  
Small Polaron ◽  
Polaron Theory
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