scholarly journals Electronic Charge Transport: Breakdown of the Small‐Polaron Hopping Model in Higher‐Order Spinels (Adv. Mater. 49/2020)

2020 ◽  
Vol 32 (49) ◽  
pp. 2070368
Author(s):  
Anuj Bhargava ◽  
Roni Eppstein ◽  
Jiaxin Sun ◽  
Michelle A. Smeaton ◽  
Hanjong Paik ◽  
...  
Keyword(s):  
Charge Transport ◽  
Small Polaron ◽  
Higher Order ◽  
Electronic Charge ◽  
Polaron Hopping ◽  
Small Polaron Hopping ◽  
Hopping Model

Breakdown of the Small‐Polaron Hopping Model in Higher‐Order Spinels

2020 ◽  
Vol 32 (49) ◽  
pp. 2004490
Author(s):  
Anuj Bhargava ◽  
Roni Eppstein ◽  
Jiaxin Sun ◽  
Michelle A. Smeaton ◽  
Hanjong Paik ◽  
...  
Keyword(s):  
Small Polaron ◽  
Higher Order ◽  
Polaron Hopping ◽  
Small Polaron Hopping ◽  
Hopping Model

scholarly journals Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks

2018 ◽  
Vol 140 (39) ◽  
pp. 12611-12621 ◽  
Author(s):  
Suchithra Ashoka Sahadevan ◽  
Alexandre Abhervé ◽  
Noemi Monni ◽  
Cristina Sáenz de Pipaón ◽  
José Ramón Galán-Mascarós ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Small Polaron ◽  
Mixed Valence ◽  
Polaron Hopping ◽  
Small Polaron Hopping ◽  
Hopping Model

Charge Transport Mechanism in Molecularly Doped Polymers

1992 ◽  
Vol 277 ◽  
Author(s):  
H. Nishizawa ◽  
M. Sugiuchi ◽  
T. Uehara
Keyword(s):  
Charge Transport ◽  
Coulomb Interaction ◽  
Transport Mechanism ◽  
Small Polaron ◽  
Dipole Interaction ◽  
Charge Transport Mechanism ◽  
Polaron Hopping ◽  
Small Polaron Hopping ◽  
Mobility Behavior ◽  
Doped Polymers

Charge-dipole interaction effects in molecularly doped polymers are discussed. The charge-dipole Coulomb interaction makes exponentially distributed traps. Calculating the mobility with their traps leads to mobility behavior like Gill's equation. The cancellation of a dipole corresponds to coincidence events of small-polaron hopping.

Electrical transport properties of single-crystalline Mn–Zn ferrous ferrite

2001 ◽  
Vol 16 (3) ◽  
pp. 774-777 ◽  
Author(s):  
Yong-Chae Chung ◽  
Han-Ill Yoo
Keyword(s):  
Transport Properties ◽  
Thermoelectric Power ◽  
Electrical Transport ◽  
Small Polaron ◽  
Electrical Transport Properties ◽  
Polaron Hopping ◽  
Single Crystalline ◽  
Small Polaron Hopping ◽  
Hopping Model ◽  
Cation Redistribution

Electrical transport properties, electrical conductivity, and thermoelectric power of a single-crystalline Mn0.45Zn0.43Fe2.12O4 were measured as functions of temperature in the range of 25 to 1000 °C. According to the small polaron hopping model, the values of the activation energy for small polaron hopping (EH) were obtained from the conductivity data in three different temperature regions: 0.032 eV for T < TC, 0.12 eV for TC < T < 600 °C, and 0.25 eV for 600 °C < T < 1000 °C. The behavior of conductivity and thermoelectric power data above TC is discussed in connection with cation redistribution.

ELECTRICAL AND MAGNETO-TRANSPORT PROPERTIES OF La0.8Sr0.2MnO3

2011 ◽  
Vol 25 (28) ◽  
pp. 3825-3833
Author(s):  
S. T. SHILAN ◽  
L. S. EWE ◽  
R. ABD-SHUKOR
Keyword(s):  
Transport Properties ◽  
Sintering Temperature ◽  
Small Polaron ◽  
Variable Range Hopping ◽  
Polaron Hopping ◽  
Variable Range ◽  
Small Polaron Hopping ◽  
Paramagnetic Region ◽  
Magneto Resistance ◽  
Hopping Model

The effects of sintering temperature on the electrical and magneto-transport properties of La 0.8 Sr 0.2 MnO 3 compounds prepared by employing a chemical co-precipitation route sintered at 1120°C, 1220°C and 1320°C are reported. The X-ray powder diffraction patterns for all samples can be indexed to the rhombohedra structure with R3C space group. The insulator–metal transition temperature remained nearly constant (~291 K) for all samples. The magneto resistance (MR) values were found to decrease noticeably as the sintering temperature was increased from 1120°C to 1320°C. Above 0.3 T, the magneto resistance was influenced by To values, which indicates the bending of Mn–O–Mn bond. The resistivity data were fitted with several equations in the metallic (ferromagnetic) region. In the insulating (paramagnetic) region, the variable range hopping and small polaron hopping models were used to compute the density of states at the Fermi level, N(EF), and activation energy (Ea) of the electrons. The resistivities can be fitted well with ρ–T2 and ρ–T2.5 curves. The variable range hopping model and small polaron hopping model fitted very well at high temperature regions, indicating that small polaron hopping might be responsible for the conduction. La 0.8 Sr 0.2 MnO 3 sintered at 1220°C demonstrated the highest MR of 6.5% in 1 T magnetic field.

scholarly journals Small Polaron Hopping in Fe:LiNbO3 as a Function of Temperature and Composition

Crystals ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 294 ◽  
Author(s):  
Laura Vittadello ◽  
Marco Bazzan ◽  
Simon Messerschmidt ◽  
Mirco Imlau
Keyword(s):  
Charge Transport ◽  
Transient Absorption ◽  
Small Polaron ◽  
Transient Absorption Spectroscopy ◽  
Relaxation Dynamics ◽  
Experimental Conditions ◽  
Polaron Hopping ◽  
Small Polaron Hopping ◽  
Wide Range ◽  
Temperature Ranges

Small-polaron hopping involved in charge transport in Fe-doped congruent lithium niobate is investigated as a function of temperature and composition by means of light-induced transient absorption spectroscopy. The relaxation dynamics of the light-induced polaron population is characterized by individual activation energies within different temperature ranges. A numerical investigation carried out by Monte Carlo simulations reveals that these findings may be understood in terms of the varying abundance of the different types of hops that the polarons may perform among regular or defective lattice sites. The role of the temperature and of the sample composition on the distribution of the different hop types is thus explored for a wide range of parameters, allowing one to preview the charge transport properties for a given set of experimental conditions.

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