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Metal-insulator transition and electroresistance in Ianthanum/calcium manganites La1-xCaxMn03 (x=0-0.5) from voltage-current-temperature surfaces

Journal Article


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Abstract


  • Of the perovskites, ABX3, a subset of special interest is the family in which the A site is

    occupied by a lanthanide ion, the B site by a transition metal and X is oxygen, as such

    materials often exhibit a large change in electrical resistance in a magnetic field, a

    phenomenon known as "colossal" magnetoresistance (MR). Two additional phenomena in

    this family have also drawn attention: the metal-insulator transition (MIT) and

    electroresistance (ER). The MIT is revealed by measuring resistance as a function of

    temperature, and observing a change in the sign of the gradient. ER – the dependence of

    the resistance on applied current – is revealed by measuring resistance as a function of

    applied current. Up until now, the phenomena of MIT and ER have been treated separately.

    Here we report simultaneous observation of the MIT and ER in the lanthanum/calcium

    manganites. We accomplish this by measuring voltage-current curves over a wide

    temperature range (10–300 K) allowing us to build up an experimental voltage surface

    over current-temperature axes. These data directly lead to resistance surfaces. This

    approach provides additional insight into the phenomena of electrical transport in the

    lanthanum/calcium manganites, in particular the close connection of the maximum ER to

    the occurrence of the MIT in those cases of a paramagnetic insulator (PMI) to

    ferromagnetic metal (FMM) transition.

    PACS Codes: 71.30.+h, 71.38.-k, 75.47.Lx

Publication Date


  • 2008

Citation


  • Knott, J., Pond, D. & Lewis, R. A. (2008). Metal-insulator transition and electroresistance in Ianthanum/calcium manganites La1-xCaxMn03 (x=0-0.5) from voltage-current-temperature surfaces. PMC Physics B, 1 (2), 1-15.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5981&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/3050

Number Of Pages


  • 14

Start Page


  • 1

End Page


  • 15

Volume


  • 1

Issue


  • 2

Abstract


  • Of the perovskites, ABX3, a subset of special interest is the family in which the A site is

    occupied by a lanthanide ion, the B site by a transition metal and X is oxygen, as such

    materials often exhibit a large change in electrical resistance in a magnetic field, a

    phenomenon known as "colossal" magnetoresistance (MR). Two additional phenomena in

    this family have also drawn attention: the metal-insulator transition (MIT) and

    electroresistance (ER). The MIT is revealed by measuring resistance as a function of

    temperature, and observing a change in the sign of the gradient. ER – the dependence of

    the resistance on applied current – is revealed by measuring resistance as a function of

    applied current. Up until now, the phenomena of MIT and ER have been treated separately.

    Here we report simultaneous observation of the MIT and ER in the lanthanum/calcium

    manganites. We accomplish this by measuring voltage-current curves over a wide

    temperature range (10–300 K) allowing us to build up an experimental voltage surface

    over current-temperature axes. These data directly lead to resistance surfaces. This

    approach provides additional insight into the phenomena of electrical transport in the

    lanthanum/calcium manganites, in particular the close connection of the maximum ER to

    the occurrence of the MIT in those cases of a paramagnetic insulator (PMI) to

    ferromagnetic metal (FMM) transition.

    PACS Codes: 71.30.+h, 71.38.-k, 75.47.Lx

Publication Date


  • 2008

Citation


  • Knott, J., Pond, D. & Lewis, R. A. (2008). Metal-insulator transition and electroresistance in Ianthanum/calcium manganites La1-xCaxMn03 (x=0-0.5) from voltage-current-temperature surfaces. PMC Physics B, 1 (2), 1-15.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=5981&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/3050

Number Of Pages


  • 14

Start Page


  • 1

End Page


  • 15

Volume


  • 1

Issue


  • 2