Colossal magnetotransport phenomena due to phase competition in Pr 1-x(CaySr1-y) xMnO3 single crystals

J. Wu; H. Zheng; J. F. Mitchell; C. Leighton

doi:10.1016/j.jmmm.2004.09.005

Colossal magnetotransport phenomena due to phase competition in Pr _1-x(Ca_ySr_1-y) _xMnO₃ single crystals

J. Wu, H. Zheng, J. F. Mitchell, C. Leighton

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We present a magnetotransport investigation of single crystal Pr _0.65(Ca_0.75Sr_0.25)_0.35MnO ₃, a manganite system specifically tailored to result in a close competition between ferromagnetic metallic and charge ordered antiferromagnetic insulating phases. Below 165 K these phases coexist spatially, with application of a magnetic field favoring the ferromagnetic metallic phase, leading to a magnetoresistance ratio of>10¹⁰ in a 2 T magnetic field. Isothermal resistivity vs. field measurements reveal some previously unobserved features accompanying the insulator to metal transition. In addition to unexpected fine structure that occurs as the ferromagnetic metallic phase grows to engulf the entire sample, we observe an intriguing "overshoot" phenomenon in both temperature and field-driven insulator-metal transitions. The resistivity is found to reach a sharp minimum (lower even than the pure ferromagnetic metallic phase) close to the point where the metallic phase percolates. These features are explored in detail and we discuss possible explanations of the effects in terms of pinning of the spatial boundary between the magnetic phases, and the unusual transport effects that could occur when the current flows through a barely percolated path.

Original language	English (US)
Pages (from-to)	146-154
Number of pages	9
Journal	Journal of Magnetism and Magnetic Materials
Volume	288
DOIs	https://doi.org/10.1016/j.jmmm.2004.09.005
State	Published - Mar 2005

Bibliographical note

Funding Information:
Work at Argonne National Lab was partially supported by the US Department of Energy, Office of Science under contract no. W-31-109-ENG-38. Acknowledgement is made to the donors of the American Chemical Society Petroleum Research Fund for partial support of the research at UMN. C.L. would like to acknowledge illuminating discussions with P.A. Crowell and P. Schiffer. J.W. and C.L. thank R. Compton for assistance with magnetization and transport measurements.

Keywords

Colossal magnetoresistance
Manganites
Metal-insulator transition
Phase separation

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title = "Colossal magnetotransport phenomena due to phase competition in Pr 1-x(CaySr1-y) xMnO3 single crystals",

abstract = "We present a magnetotransport investigation of single crystal Pr 0.65(Ca0.75Sr0.25)0.35MnO 3, a manganite system specifically tailored to result in a close competition between ferromagnetic metallic and charge ordered antiferromagnetic insulating phases. Below 165 K these phases coexist spatially, with application of a magnetic field favoring the ferromagnetic metallic phase, leading to a magnetoresistance ratio of>1010 in a 2 T magnetic field. Isothermal resistivity vs. field measurements reveal some previously unobserved features accompanying the insulator to metal transition. In addition to unexpected fine structure that occurs as the ferromagnetic metallic phase grows to engulf the entire sample, we observe an intriguing {"}overshoot{"} phenomenon in both temperature and field-driven insulator-metal transitions. The resistivity is found to reach a sharp minimum (lower even than the pure ferromagnetic metallic phase) close to the point where the metallic phase percolates. These features are explored in detail and we discuss possible explanations of the effects in terms of pinning of the spatial boundary between the magnetic phases, and the unusual transport effects that could occur when the current flows through a barely percolated path.",

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N2 - We present a magnetotransport investigation of single crystal Pr 0.65(Ca0.75Sr0.25)0.35MnO 3, a manganite system specifically tailored to result in a close competition between ferromagnetic metallic and charge ordered antiferromagnetic insulating phases. Below 165 K these phases coexist spatially, with application of a magnetic field favoring the ferromagnetic metallic phase, leading to a magnetoresistance ratio of>1010 in a 2 T magnetic field. Isothermal resistivity vs. field measurements reveal some previously unobserved features accompanying the insulator to metal transition. In addition to unexpected fine structure that occurs as the ferromagnetic metallic phase grows to engulf the entire sample, we observe an intriguing "overshoot" phenomenon in both temperature and field-driven insulator-metal transitions. The resistivity is found to reach a sharp minimum (lower even than the pure ferromagnetic metallic phase) close to the point where the metallic phase percolates. These features are explored in detail and we discuss possible explanations of the effects in terms of pinning of the spatial boundary between the magnetic phases, and the unusual transport effects that could occur when the current flows through a barely percolated path.

AB - We present a magnetotransport investigation of single crystal Pr 0.65(Ca0.75Sr0.25)0.35MnO 3, a manganite system specifically tailored to result in a close competition between ferromagnetic metallic and charge ordered antiferromagnetic insulating phases. Below 165 K these phases coexist spatially, with application of a magnetic field favoring the ferromagnetic metallic phase, leading to a magnetoresistance ratio of>1010 in a 2 T magnetic field. Isothermal resistivity vs. field measurements reveal some previously unobserved features accompanying the insulator to metal transition. In addition to unexpected fine structure that occurs as the ferromagnetic metallic phase grows to engulf the entire sample, we observe an intriguing "overshoot" phenomenon in both temperature and field-driven insulator-metal transitions. The resistivity is found to reach a sharp minimum (lower even than the pure ferromagnetic metallic phase) close to the point where the metallic phase percolates. These features are explored in detail and we discuss possible explanations of the effects in terms of pinning of the spatial boundary between the magnetic phases, and the unusual transport effects that could occur when the current flows through a barely percolated path.

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