Field-induced ferromagnetic order and colossal magnetoresistance in La1.2Sr1.8Mn2O7: A La139 NMR study

Y. Shiotani; J. L. Sarrao; Guo Qing Zheng

doi:10.1103/PhysRevLett.96.057203

Field-induced ferromagnetic order and colossal magnetoresistance in La1.2Sr1.8Mn2O7: A La139 NMR study

Y. Shiotani, J. L. Sarrao, Guo Qing Zheng

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

11 Citations (Scopus)

Abstract

In order to gain insights into the origin of colossal magnetoresistance (CMR) in manganese oxides, we performed a La139 NMR study in the double-layered compound La1.2Sr1.8Mn2O7. We find that above the Curie temperature TC=126K, applying a magnetic field induces a long-range ferromagnetic order that persists up to T=330K. The critical field at which the induced magnetic moment is saturated coincides with the field at which the CMR effect reaches a maximum. Our results therefore indicate that the CMR observed above TC in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.

Original language	English
Article number	057203
Journal	Physical Review Letters
Volume	96
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.96.057203
Publication status	Published - 2006

ASJC Scopus subject areas

Physics and Astronomy(all)

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abstract = "In order to gain insights into the origin of colossal magnetoresistance (CMR) in manganese oxides, we performed a La139 NMR study in the double-layered compound La1.2Sr1.8Mn2O7. We find that above the Curie temperature TC=126K, applying a magnetic field induces a long-range ferromagnetic order that persists up to T=330K. The critical field at which the induced magnetic moment is saturated coincides with the field at which the CMR effect reaches a maximum. Our results therefore indicate that the CMR observed above TC in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.",

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AB - In order to gain insights into the origin of colossal magnetoresistance (CMR) in manganese oxides, we performed a La139 NMR study in the double-layered compound La1.2Sr1.8Mn2O7. We find that above the Curie temperature TC=126K, applying a magnetic field induces a long-range ferromagnetic order that persists up to T=330K. The critical field at which the induced magnetic moment is saturated coincides with the field at which the CMR effect reaches a maximum. Our results therefore indicate that the CMR observed above TC in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.

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Field-induced ferromagnetic order and colossal magnetoresistance in La1.2Sr1.8Mn2O7: A La139 NMR study

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