Defect Induced Enhanced Low Field Magnetoresistance and Photoresponse in Pr0.6Ca0.4MnO3 thin Films

Tomi Elovaara, Sayani Majumdar, Hannu Huhtinen, Petriina Paturi

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Abstract

We have investigated the effect of grain boundary related defects on the electronic transport properties of the colossal magnetoresistive low bandwidth manganite Pr0:6Ca0:4MnO3 (PCMO) thin films. A series of PCMO films were prepared by pulsed laser deposition method on MgO and STO substrates. Characterizations of the structural, magnetic and magneto-transport properties show that the films prepared on MgO substrate contain higher amount of structural defects and with decreasing deposition temperature an increasing amount of difierent crystal orientations as the level of texturing decreases. According to the low field magnetoresistance (MR) measurements, the poorly textured samples display an increased low field MR due to a grain boundary tunneling effect at low temperatures compared to the fully textured PCMO film on STO substrate. However, in spite of the level of texturing, all the samples showed a colossal magnetoresistive insulator to metal switching of almost eight orders of magnitude at low temperatures. The magnetic field required for insulator to metal transition (IMT) is much higher in PCMO samples with more structural defects. However, IMT field could be reduced over 3 T by illuminating the sample.

Original languageEnglish
Title of host publication20th International Conference on Magnetism, ICM 2015
PublisherElsevier
Pages62-69
Number of pages8
DOIs
Publication statusPublished - 2015
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Magnetism - Barceló Congresos Pl. Europa, 17-19 1st floor 08908 L' Hospitalet del Llobregat Barcelona (Spain), Barcelona, Spain
Duration: 5 Jul 201510 Jul 2015
Conference number: 20
http://www.barcelocongresos.com.es/archivo/2015ICM/contact.html

Publication series

NamePhysics Procedia
Volume75
ISSN (Print)1875-3892

Conference

ConferenceInternational Conference on Magnetism
Abbreviated titleICM
CountrySpain
CityBarcelona
Period05/07/201510/07/2015
Internet address

Keywords

  • colossal magnetophotoresistance
  • grain boundaries
  • low bandwidth manganite
  • low field magnetoresistance
  • thin film

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