Published January 27, 2014 | Version v1
Journal article Metadata-only

Low temperature hopping in granular oxides La0.67Ca0.33MnO3 and La0.5Sr0.5CoO3

Creators

  • 1. Research Group, Equipe de Semiconducteurs, de Nanotechnologie et de Programmation Scientifique, Physics department, Ibn Zohr University, Faculty of Sciences, B.P 8106, Hay Dakhla, 80000 Agadir (Morocco)
  • 2. School of Electronic and Electrical Engineering Sungkyunkwan University, Sunwon 440-746, Korea and Department of Physics, National Taiwan University, Taipei, Taiwan (China)
  • 3. Laboratoire Electronique, Électrotechnique, Automatique et Traitement de l'Information (EEA TI). Département Génie Electrique Université Hassan II Mohammedia Casablanca, Faculté des Sciences et Techniques de Mohamme (Morocco)

Description

We studied electrical transport in La0.67Sr0.33MnO3 (LCMO) and La0.5Sr0.5CoO3 (LSCO) nanocrystals over a temperature range of 0.4 K ≤ T ≤ 5 K. In both samples, two distinct behaviors of the conductivity are observed. For T>1 K, the variable range hopping regime is observed in LCMO sample with enhancement of the relative permittivity. In contrast, this behavior is not consistent with the extracted parameters in LSCO sample. For T<1 K, the transport is believed to occur through the metallic droplets connected to the intergranular regions where the negative magnetoresistance is due to spin-polarized tunneling phenomenon

Additional details

Identifiers

DOI
10.1063/1.4860637;

Publishing Information

Journal Title
AIP Conference Proceedings
Journal Volume
1574
Journal Issue
1
Journal Page Range
p. 286-290
ISSN
0094-243X
CODEN
APCPCS

Conference

Title
International cryogenic materials conference
Dates
17-21 Jun 2013
Place
Anchorage, AK (United States)

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
45085274
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
DROPLETS; MAGNETORESISTANCE; NANOSTRUCTURES; OXIDES; PERMITTIVITY; SPIN ORIENTATION; TUNNEL EFFECT
Descriptors DEC
CHALCOGENIDES; DIELECTRIC PROPERTIES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ORIENTATION; OXYGEN COMPOUNDS; PARTICLES; PHYSICAL PROPERTIES

Optional Information

Notes
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