Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-05-25
J. Mater. Research, Volume: 22, #: 8. Pages: 2163-2173 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
23 pages, 16 figures, to be published in JMR's Aug. focus issue on multiferroics
Scientific paper
10.1557/jmr.2007.0271
The magnetic phase diagrams of RMnO3 (R = Er, Yb, Tm, Ho) are investigated up to 14 Tesla via magnetic and dielectric measurements. The stability range of the AFM order below the Neel 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 Tesla. The results are discussed based on existing data on magnetic symmetries and the interactions between the Mn-spins, the rare earth moments, and the lattice.
Chu Cheng-Wei
Cruz Clarina dela
Galstyan E.
Gospodinov M. M.
Lorenz Beat
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