Journal
APPLIED PHYSICS LETTERS
Volume 78, Issue 24, Pages 3863-3865Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1379597
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The low-temperature magnetic and transport properties of La2/3Sr1/3MnO3 nanoparticles have been investigated. It is found that a surface spin-glass behavior exists in La2/3Sr1/3MnO3 nanoparticles, which undergo a magnetic transition to a frozen state below 45 K. The low-temperature surface spin-glass behavior exists even at the highest field used (H = 50 kOe). Moreover, the spin-glass-like transition disappears for particles above 50 nm, In addition, the suppressed low-field magnetoconductivity (LFMC) observed at low temperature for nanosized La2/3Sr1/3MnO3 is obviously lower than the expected upper limit of LFMC, 1/3, for polycrystalline manganites, which is proposed to arise from the higher-order tunneling through the insulating spin-glass-like surface layers. (C) 2001 American Institute of Physics.
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