Colossal magnetoresistance mechanism in doped manganites based on the canted ferromagnetic phase

2010 ◽  
Vol 107 (9) ◽  
pp. 09B109 ◽  
Author(s):  
Koba O. Khutsishvili ◽  
Nathalie P. Fokina
Keyword(s):  
Colossal Magnetoresistance ◽  
Ferromagnetic Phase ◽  
Doped Manganites

scholarly journals Theory of Insulator Metal Transition and Colossal Magnetoresistance in Doped Manganites

2004 ◽  
Vol 92 (15) ◽  
Author(s):  
T. V. Ramakrishnan ◽  
H. R. Krishnamurthy ◽  
S. R. Hassan ◽  
G. Venketeswara Pai
Keyword(s):  
Colossal Magnetoresistance ◽  
Insulator Metal Transition ◽  
Doped Manganites

Colossal magnetoresistance in doped manganites: A consequence of percolation and phase separation

2001 ◽  
Vol 79 (4) ◽  
pp. 506-508 ◽  
Author(s):  
A. K. Pradhan ◽  
Y. Feng ◽  
B. K. Roul ◽  
D. R. Sahu
Keyword(s):  
Phase Separation ◽  
Colossal Magnetoresistance ◽  
Doped Manganites

Conductivity and Isotope Effect in the Colossal Magnetoresistance

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3397-3405 ◽  
Author(s):  
Y. M. Malozovsky ◽  
J. D. Fan ◽  
D. Bagayoko
Keyword(s):  
Curie Temperature ◽  
Isotope Effect ◽  
Colossal Magnetoresistance ◽  
Manganese Oxides ◽  
Spin Diffusion ◽  
Magnetic Moments ◽  
Ferromagnetic Phase ◽  
Temperature Dependence Of Conductivity ◽  
Ferromagnetic Phase Transition ◽  
Localized Electrons

The diffusion of nearly localized electrons is considered in the presence of the spin-dependent and multiple scattering on the randomly oriented and/or distributed magnetic moments of scatterers. The spin diffusion coefficient in the case of the exchange interaction between the diffusive but nearly localized electrons is evaluated. It is shown that the electron localization leads to the vanishing of the spin diffusion and hence the ferromagnetic phase transition. The isotope effect in the Curie temperature in the case of the electron–phonon inelastic relaxation is obtained, as experimentally observed in the manganese oxides by Zhao and co-workers.11 The strong spin-polaron effect caused by the interaction of the diffusive electrons with the diffusive paramagnons significantly reduces conductivity near the Curie temperature. The temperature dependence of conductivity in the absence and presence of an external magnetic field is discussed as well.

Theory of ferromagnetism and colossal magnetoresistance in doped manganites

1999 ◽  
Vol 85 (8) ◽  
pp. 4349-4351 ◽  
Author(s):  
A. S. Alexandrov ◽  
A. M. Bratkovsky
Keyword(s):  
Colossal Magnetoresistance ◽  
Doped Manganites

Paramagnetic anomalies above the Curie temperature and colossal magnetoresistance in optimally doped manganites

2000 ◽  
Vol 62 (9) ◽  
pp. 5313-5315 ◽  
Author(s):  
S. L. Yuan ◽  
J. Q. Li ◽  
Y. Jiang ◽  
Y. P. Yang ◽  
X. Y. Zeng ◽  
...  
Keyword(s):  
Curie Temperature ◽  
Colossal Magnetoresistance ◽  
Doped Manganites

scholarly journals p-Wave Pairing and Colossal Magnetoresistance in Manganese Oxides

1998 ◽  
Vol 12 (13) ◽  
pp. 507-518 ◽  
Author(s):  
Yong-Jihn Kim
Keyword(s):  
Colossal Magnetoresistance ◽  
Manganese Oxides ◽  
P Wave ◽  
Ferromagnetic Phase ◽  
Sharp Drop ◽  
Wave Pairing ◽  
Magnetic Inhomogeneities ◽  
Gap Opening ◽  
Superconducting Fluctuations ◽  
Room Temperature Superconductivity

We point out that the existing experimental data of most manganese oxides show the frustratedp-wave superconducting condensation in the ferromagnetic phase in the sense that the superconducting coherence is not long enough to cover the whole system. The superconducting state is similar to the A1 state in superfluid He-3. The sharp drop of resistivity, the steep jump of specific heat, and the gap opening in tunneling are well understood in terms of the p-wave pairing. In addition, colossal magnetoresistance (CMR) is naturally explained by the superconducting fluctuations with increasing magnetic fields. The finite resistivity may be due to some magnetic inhomogeneities. This study leads to the possibility of room temperature superconductivity.

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