Phase coexistence and collapse of charge ordering in low dimensional (La,Pr)CaMnO$_{3}$
ORAL
Abstract
La$_{5/8}$Pr$_{3/8-x}$Ca$_{x}$MnO$_{3 }$(LPCMO) manganites exhibit a complex phase diagram due to coexisting and competing magnetic and electronic phases. Of particular interest is the charge-ordered (CO) phase that is unstable under various perturbations, such as carrier doping, strain, magnetic and electric field. Our systematic magnetic, transverse susceptibility (TS) and magnetocaloric studies on LPCMO nanocrystalline and thin film materials reveal that the long-range CO is largely suppressed and the ferromagnetic (FM) order is established in these systems. The nanocrystalline samples ($\sim $50nm in diameter) were prepared by sol-gel method, while the thin films ($\sim $70 nm in thickness) were epitaxially grown on LaAlO$_{3}$ and SrLaGaO$_{4}$ substrates. The magnetic anisotropy of the FM phase and the metamagnetic transition are probed by TS experiments. These results point to the importance of the particle-size and strain effects on the CO and FM states in low-dimensional LPCMO systems.
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Authors
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N. Laurita
University of South Florida
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S. Chandra
University of South Florida
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N.S. Bingham
University of South Florida
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M.H. Phan
University of South Florida, Oak Ridge National Laboratory, Hanoi University of Technology
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H. Srikanth
University of South Florida-Physics, University of South Florida
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M.H. Phan
University of South Florida, Oak Ridge National Laboratory, Hanoi University of Technology
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M.H. Phan
University of South Florida, Oak Ridge National Laboratory, Hanoi University of Technology
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M.H. Phan
University of South Florida, Oak Ridge National Laboratory, Hanoi University of Technology
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M.H. Phan
University of South Florida, Oak Ridge National Laboratory, Hanoi University of Technology