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Magnetic phase diagrams of multiferroic hexagonal RMnO3 (R = Er, Yb, Tm, and Ho)

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Abstract

The magnetic phase diagrams of RMnO3 (R = Er, Yb, Tm, Ho) are investigated up to 14 T via magnetic and dielectric measurements. The stability range of the atomic force microscopy order below the Néel temperature of the studied RMnO3 extends to far higher magnetic fields than previously assumed. Magnetic irreversibility indicating the presence of a spontaneous magnetic moment is found near 50 K for R = Er, Yb, and Tm. At very low temperatures and low magnetic fields, the phase boundary defined by the ordering of the rare-earth moments is resolved. The sizable dielectric anomalies observed along all phase boundaries are evidence for strong spin-lattice coupling in the hexagonal RMnO3. In HoMnO3, the strong magnetoelastic distortions are investigated in more detail via magnetostriction experiments up to 14 T. The results are discussed based on existing data on magnetic symmetries and the interactions among the Mn-spins, the rare-earth moments, and the lattice.

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ACKNOWLEDGMENTS

This work was supported in part by the T.L.L. Temple Foundation, the J.J. and R. Moores Endowment, and the State of Texas through the Texas Center for Superconductivity at the University of Houston, and at Lawrence Berkeley National Laboratory by the United States Department of Energy. The work of M.M. Gospodinov is supported by the Bulgarian Science Fund (Grant No. F 1207).

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Authors and Affiliations

  1. Department of Physics and Texas Center for Superconductivity at the University of Houston, University of Houston, Houston, Texas, 77204-5002, USA

    F. Yen, C. dela Cruz, B. Lorenz, E. Galstyan, Y.Y. Sun & C.W. Chu

  2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria

    M. Gospodinov

  3. Lawrence Berkeley National Laboratory, Berkeley, California, 94720, USA

    C.W. Chu

  4. Hong Kong University of Science and Technology, Hong Kong, China

    C.W. Chu

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  1. F. Yen
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  2. C. dela Cruz
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  3. B. Lorenz
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  4. E. Galstyan
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  5. Y.Y. Sun
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  6. M. Gospodinov
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  7. C.W. Chu
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Correspondence to F. Yen.

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Yen, F., dela Cruz, C., Lorenz, B. et al. Magnetic phase diagrams of multiferroic hexagonal RMnO3 (R = Er, Yb, Tm, and Ho). Journal of Materials Research 22, 2163–2173 (2007). https://doi.org/10.1557/jmr.2007.0271

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