Transport and magnetism correlations in thin-film ferromagnetic oxides

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In order to determine the {Tc}-dependence of the colossal magnetoresistance (MR) exhibited by the ferromagnetic La{sub 0.7}M{sub 0.3}MnO{sub 3+{sigma}} (M = Ba, Ca, Sr) system, the authors examine the magnetic-field and temperature dependent resistivity and magnetization of a series of thin films that were grown via pulsed-laser deposition. The films had magnetic ordering temperatures (T{sub C}) ranging from 150 to 350 K; all samples displayed a large negative MR that is largest near {Tc}. The magnitude of a given sample`s MR at {Tc} inversely correlates with {Tc}; samples with a low {Tc} display significantly larger MR values than do samples ... continued below

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13 p.

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Hundley, M.F.; Neumeier, J.J.; Heffner, R.H.; Jia, Q.X.; Wu, X.D. & Thompson, J.D. September 1, 1995.

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Description

In order to determine the {Tc}-dependence of the colossal magnetoresistance (MR) exhibited by the ferromagnetic La{sub 0.7}M{sub 0.3}MnO{sub 3+{sigma}} (M = Ba, Ca, Sr) system, the authors examine the magnetic-field and temperature dependent resistivity and magnetization of a series of thin films that were grown via pulsed-laser deposition. The films had magnetic ordering temperatures (T{sub C}) ranging from 150 to 350 K; all samples displayed a large negative MR that is largest near {Tc}. The magnitude of a given sample`s MR at {Tc} inversely correlates with {Tc}; samples with a low {Tc} display significantly larger MR values than do samples with large {Tc}`s. The quantity {rho}({Tc})/{rho}(4 K), the amount by which the resistivity is reduced by full ferromagnetic order, is an activated function of {Tc} with an activation energy E{sub a} = 0.1 eV. These results indicate that the magnitude of the CMR effect in a given specimen is controlled not by {rho}({Tc}), but by {Tc} via the ratio {rho}({Tc})/{rho}(4 K). Phenomenological scaling relationships are also reported that link {rho}(H,T) to both H and M(H, T).

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13 p.

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INIS; OSTI as DE96000069

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  • 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995

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  • Other: DE96000069
  • Report No.: LA-UR--95-3027
  • Report No.: CONF-951101--4
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/113963 | External Link
  • Office of Scientific & Technical Information Report Number: 113963
  • Archival Resource Key: ark:/67531/metadc624265

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  • September 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Feb. 26, 2016, 6:49 p.m.

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Hundley, M.F.; Neumeier, J.J.; Heffner, R.H.; Jia, Q.X.; Wu, X.D. & Thompson, J.D. Transport and magnetism correlations in thin-film ferromagnetic oxides, report, September 1, 1995; New Mexico. (digital.library.unt.edu/ark:/67531/metadc624265/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.