Impact of nanostructuring on the magnetic and magnetocaloric properties of microscale phase-separated La5/8–yPryCa3/8MnO₃ manganites

Bingham, N. S.; Lampen, P.; Phan, M. H.; Hoang, T. D.; Chinh, H. D.; Zhang, C. L.; Cheong, S. W.; Srikanth, H.

doi:10.1103/PhysRevB.86.064420

Impact of nanostructuring on the magnetic and magnetocaloric properties of microscale phase-separated La_5/8–yPr_yCa_3/8MnO₃ manganites

Journal Article · Thu Aug 16 00:00:00 EDT 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.86.064420· OSTI ID:1103129

Bingham, N. S.; Lampen, P.; Phan, M. H.; Hoang, T. D.; Chinh, H. D.; Zhang, C. L.; Cheong, S. W.; Srikanth, H.

Bulk manganites of the form La_5/8–yPr_yCa_3/8MnO₃ (LPCMO) exhibit a complex phase diagram due to coexisting charge-ordered antiferromagnetic (CO/AFM), charge-disordered paramagnetic (PM), and ferromagnetic (FM) phases. Because phase separation in LPCMO occurs on the microscale, reducing particle size to below this characteristic length is expected to have a strong impact on the magnetic properties of the system. Through a comparative study of the magnetic and magnetocaloric properties of single-crystalline (bulk) and nanocrystalline LPCMO (y=3/8) we show that the AFM, CO, and FM transitions seen in the single crystal can also be observed in the large particle sizes (400 and 150 nm), while only a single PM to FM transition is found for the small particles (55 nm). Magnetic and magnetocaloric measurements reveal that decreasing particle size affects the balance of competing phases in LPCMO and narrows the range of fields over which PM, FM, and CO phases coexist. The FM volume fraction increases with size reduction, until CO is suppressed below some critical size, ~100 nm. With size reduction, the saturation magnetization and field sensitivity first increase as long-range CO is inhibited, then decrease as surface effects become increasingly important. The trend that the FM phase is stabilized on the nanoscale is contrasted with the stabilization of the charge-disordered PM phase occurring on the microscale, demonstrating that in terms of the characteristic phase separation length, a few microns and several hundred nanometers represent very different regimes in LPCMO.

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Sponsoring Organization:: USDOE

OSTI ID:: 1103129

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 6 Vol. 86; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Impact of nanostructuring on the magnetic and magnetocaloric properties of microscale phase-separated La_5/8–yPr_yCa_3/8MnO₃ manganites