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

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.

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

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.

Small polaron hopping conduction mechanism in Fe doped LaMnO3

2011 ◽  
Vol 135 (5) ◽  
pp. 054501 ◽  
Author(s):  
Wasi Khan ◽  
Alim H. Naqvi ◽  
Maneesha Gupta ◽  
Shahid Husain ◽  
Ravi Kumar
Keyword(s):  
Conduction Mechanism ◽  
Small Polaron ◽  
Hopping Conduction ◽  
Polaron Hopping ◽  
Small Polaron Hopping
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