Phase separation, percolation and giant isotope effect in manganites
نویسندگان
چکیده
منابع مشابه
Nanoscale phase separation in manganites
We study the possibility of nanoscale phase separation in manganites in the framework of the double exchange model. The homogeneous canted state of this model is proved to be unstable toward the formation of small ferromagnetic droplets inside an antiferromagnetic insulating matrix. For the ferromagnetic polaronic state we analyze the quantum effects related to the tails of electronic wave func...
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The sensitivity of transport in colossal magnetoresistance (CMR) manganites to external electric and magnetic fields is examined using field effect configurations with La(0.7)Ca(0.3)MnO(3) (LCMO), Na(0.7)Sr(0.3)MnO(3), La(0.7)Ba(0.3)MnO(3), and La(0.5)Ca(0.5)MnO(3) (0.5-doped LCMO) channels, and ferroelectric PbZr(0.2)Ti(0.8)O(3) (PZT) or dielectric (SrTiO(3)) gates. A large electroresistance (...
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A large electrochemical isotopic effect is observed upon the electrodeposition of lithium from solutions of propylene carbonate producing isotopically light metal deposits. The magnitude of fractionation is controlled by the applied overpotential and is largest close to equilibrium. Calculated partition function ratios for tetrahedrally coordinated lithium complexes and metallic lithium predict...
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Phase separation and a tendency to form inhomogeneous structures seems to be a generic property of systems with strongly correlated electrons. After shortly summarising the existing theoretical results in this direction, I concentrate on the phenomena in doped manganites. I discuss general theoretical results on the phase separation at small doping and close to the doping x = 0.5. The " global ...
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1 Spin Superstructure Project (ERATO-SSS), Japan Science and Technology Agency (JST), AIST Central 4, Tsukuba 305-8562, Japan 2 Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan, and CREST, JST, Kawaguchi, Saitama 332-0012, Japan ERATO multiferroics project, JST, c/o Department of Applied Physics , University of Tokyo, Tokyo 113-8656, Japan Department...
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ژورنال
عنوان ژورنال: Physica B: Condensed Matter
سال: 2000
ISSN: 0921-4526
DOI: 10.1016/s0921-4526(99)01720-2