Extrinsic inhomogeneity effects in magnetic, transport and magnetoresistive properties of La_{1-x}Ca_{x}MnO_{3} (x\approx 0.33) crystal prepared by the floating zone method

Abstract

The paper describes a study of the magnetic, transport and magnetoresistive properties of La_{1-x}Ca_{x}MnO_{3} (x\approx 0.33) crystals prepared by the floating-zone method. We found that these properties testify to rather good crystal perfection of the sample studied. In particular, a huge magnetoresistance ([R(0)-R(H)]/R(H) in the field H = 5 T is about 2680 %) is found near the Curie temperature (216 K). At the same time, some distinct features of measured properties indicate the influence of extrinsic inhomogeneities arising due to technological factors in the sample preparation. Analysis of the data obtained shows that these are rare grain boundaries and twins. Specific influence of the grain-boundary-like inhomogeneities on the transport and magnetoresistive properties are considered.

arXiv commentSubmitted to Physica B

References in corpus (8)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Extrinsic Magnetotransport Phenomena in Ferromagnetic Oxides
• Charge Transport in Manganites: Hopping Conduction, the Anomalous Hall Effect and Universal Scaling
• Nanoscale Phase Separation in Colossal Magnetoresistance Materials: A Lesson for the Cuprates?
• Breakdown of the lattice polaron picture in La0.7Ca0.3MnO3 single crystals
• Giant change in IR light transmission in La_{0.67}Ca_{0.33}MnO_{3} film near the Curie temperature: promising application in optical devices
• Structural response to O*-O' and magnetic transitions in orthorhombic perovskites
• Giant magnetic-field changes in radio-frequency absorption in La${}_{0.67}$Sr${}_{0.33}$MnO${}_3$ near the Curie temperature

Cited by in corpus (3)

• Influence of magnetic field on paramagnetic-ferromagnetic transition in La${}_{1-x}$Ca${}_x$MnO${}_3$ ($x\approx 0.25$) crystal: ultrasonic and transport studies
• Resistive and magnetoresistive properties of CrO2 pressed powders with different types of inter-granular dielectric layers
• Ferromagnetic Domain Structure of La0.78Ca0.22MnO3 Single Crystals