Role of structurally and magnetically modified nanoclusters in colossal magnetoresistance

It is generally accepted that electronic and magnetic phase separation is the origin of many of exotic properties of strongly correlated electron materials, such as colossal magnetoresistance (CMR), an unusually large variation in the electrical resistivity under applied magnetic field. In the simpl...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2011-12, Vol.108 (52), p.20941-20946
Main Authors: Tao, Jing, Niebieskikwiat, Dario, Jie, Qing, Schofield, Marvin A, Wu, Lijun, Li, Qiang, Zhu, Yimei
Format: Article
Language:English
Subjects:
Chemical compounds
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Cooling
ELECTRIC CONDUCTIVITY
Electric Impedance
electrical conductivity
Electrical phases
electrical resistance
Electrical resistivity
ELECTRONS
Imaging
Insulation
MAGNETIC FIELDS
Magnetics
Magnetization
MAGNETORESISTANCE
Manganese Compounds - chemistry
Microscopy, Electron, Transmission
Nanoclusters
Nanostructures - chemistry
ORIGIN
Phase Transition
Phase transitions
PHYSICAL PROPERTIES
Physical Sciences
Superstructures
Temperature
Temperature effects
Transition temperature
TRANSMISSION ELECTRON MICROSCOPY
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Summary:It is generally accepted that electronic and magnetic phase separation is the origin of many of exotic properties of strongly correlated electron materials, such as colossal magnetoresistance (CMR), an unusually large variation in the electrical resistivity under applied magnetic field. In the simplest picture, the two competing phases are those associated with the material state on either side of the phase transition. Those phases would be paramagnetic insulator and ferromagnetic metal for the CMR effect in doped manganites. It has been speculated that a critical component of the CMR phenomenon is nanoclusters with quite different properties than either of the terminal phases during the transition. However, the role of these nanoclusters in the CMR effect remains elusive because the physical properties of the nanoclusters are hard to measure when embedded in bulk materials. Here we show the unexpected behavior of the nanoclusters in the CMR compound La1-xCaxMnO3 (0.4 ≤ x 
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1107762108