Anomalous influence of an external magnetic field on spin fluctuations in magnetic semiconductors with strong p-d hybridization and the colossal magnetoresistance effect

2012 ◽  
Vol 54 (12) ◽  
pp. 2351-2356 ◽  
Author(s):  
A. G. Volkov ◽  
A. A. Povzner
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Colossal Magnetoresistance ◽  
Magnetic Semiconductors ◽  
Spin Fluctuations ◽  
Magnetoresistance Effect ◽  
Colossal Magnetoresistance Effect

Features Of Magnetoresistance In The Bilayer Single Crystal Manganite LA1.4SR1.6MN2O7

2015 ◽  
Vol 10 (1) ◽  
pp. 63-66
Author(s):  
Stanislav Nikitin ◽  
Sergey Popkov ◽  
Mikhail Petrov ◽  
Konstantin Terent’ev ◽  
Sergey Semenov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Colossal Magnetoresistance ◽  
Transport Current ◽  
Lanthanum Manganite ◽  
Magnetoresistance Effect ◽  
Positive Magnetoresistance ◽  
Lanthanum Manganites ◽  
Colossal Magnetoresistance Effect ◽  
The Magnetic Field

We investigate magnetoresistance of single-crystal bilayer lanthanum manganite La1.4Sr1.6Mn2O7 at a transport current flowing along the crystal c axis and in external magnetic fields applied parallel to the crystal c axis or ab plane. It is demonstrated that the La1.4Sr1.6Mn2O7 manganite exhibits the positive magnetoresistance effect in the magnetic field applied in the ab plane of the sample at the temperatures T < 60 K. The mechanism of this effect is shown to be fundamentally different from the colossal magnetoresistance effect typical of lanthanum manganites. The positive magnetoresistance originates from spin-dependent tunneling of carriers between the manganese-oxygen bilayers and can be explained by features of the magnetic structure of the investigated compounds.

Pressure-tuned colossal magnetoresistance effect in n-type CdCr2Se4

2021 ◽  
Vol 118 (26) ◽  
pp. 262407
Author(s):  
Bowen Zhang ◽  
Chuanchuan Gu ◽  
Chao An ◽  
Xuliang Chen ◽  
Yonghui Zhou ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Magnetoresistance Effect ◽  
Colossal Magnetoresistance Effect

55Mn NMR observation of colossal magnetoresistance effect in Sm0.55Sr0.45MnO3

2017 ◽  
Vol 29 (26) ◽  
pp. 265802 ◽  
Author(s):  
J M Michalik ◽  
D Rybicki ◽  
Z Tarnawski ◽  
M Sikora ◽  
J M De Teresa ◽  
...  
Keyword(s):  
Colossal Magnetoresistance ◽  
Magnetoresistance Effect ◽  
Colossal Magnetoresistance Effect

scholarly journals COLOSSAL EFFECTS IN TRANSITION METAL OXIDES CAUSED BY INTRINSIC INHOMOGENEITIES

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3293-3293
Author(s):  
J. BURGY ◽  
M. MAYR ◽  
V. MARTIN-MAYOR ◽  
A. MOREO ◽  
E. DAGOTTO
Keyword(s):  
Transition Metal Oxides ◽  
Colossal Magnetoresistance ◽  
Cluster Formation ◽  
Magnetoresistance Effect ◽  
Random Orientation ◽  
First Order ◽  
First Order Transition ◽  
Colossal Magnetoresistance Effect ◽  
General Aspects ◽  
Quantum Critical Behavior

The general aspects of the influence of quenched disorder on the competition between ordered states separated by a first-order transition are investigated. A phase diagram with features resembling quantum-critical behavior is observed. The paramagnetic phase at low temperature consists of coexisting ordered clusters, with a random orientation of the order parameter. Specializing to manganites, this state is shown to have a colossal magnetoresistance effect. A new scale T* for cluster formation is predicted. It is argued that cuprates have similar features, compatible with the large proximity effect of the very underdoped regime.1

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