Lattice and spin excitations in multiferroic h-YbMnO 3

J. Liu; C. Toulouse; P. Rovillain; M. Cazayous; Y. Gallais; M. A. Measson; N. Lee; Sang-Wook Cheong; A. Sacuto

doi:10.1103/PhysRevB.86.184410

Lattice and spin excitations in multiferroic h-YbMnO ₃

J. Liu, C. Toulouse, P. Rovillain, M. Cazayous, Y. Gallais, M. A. Measson, N. Lee, Sang-Wook Cheong, A. Sacuto

School of Arts and Sciences, Physics & Astronomy

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

10 Scopus citations

Abstract

Lattice and spin excitations have been studied by Raman scattering in hexagonal YbMnO ₃ single crystals. The temperature dependences of the phonon modes show that the E ₂ mode at 256 cm ^-1 related to the displacement of Mn and O ions in a-b plane is coupled to the spin order. The A ₁ phonon mode at 678 cm ^-1 presents a soft mode behavior at the Néel temperature. Connected to the motion of the apical oxygen ions along the c direction, this mode controls directly the Mn-Mn interactions between adjacent Mn planes and the superexchange path. Crystal field and magnon mode excitations have been identified. The temperature investigation of the spin excitations shows that the spin structure is strongly influenced by the Yb-Mn interaction. Under a magnetic field along the c axis, we have investigated the magnetic reordering and its impact on the spin excitations.

Original language	English (US)
Article number	184410
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.86.184410
State	Published - Nov 9 2012

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Lattice and spin excitations in multiferroic h-YbMnO 3 ",

abstract = "Lattice and spin excitations have been studied by Raman scattering in hexagonal YbMnO 3 single crystals. The temperature dependences of the phonon modes show that the E 2 mode at 256 cm -1 related to the displacement of Mn and O ions in a-b plane is coupled to the spin order. The A 1 phonon mode at 678 cm -1 presents a soft mode behavior at the N{\'e}el temperature. Connected to the motion of the apical oxygen ions along the c direction, this mode controls directly the Mn-Mn interactions between adjacent Mn planes and the superexchange path. Crystal field and magnon mode excitations have been identified. The temperature investigation of the spin excitations shows that the spin structure is strongly influenced by the Yb-Mn interaction. Under a magnetic field along the c axis, we have investigated the magnetic reordering and its impact on the spin excitations.",

author = "J. Liu and C. Toulouse and P. Rovillain and M. Cazayous and Y. Gallais and Measson, {M. A.} and N. Lee and Sang-Wook Cheong and A. Sacuto",

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T1 - Lattice and spin excitations in multiferroic h-YbMnO 3

AU - Liu, J.

AU - Toulouse, C.

AU - Rovillain, P.

AU - Cazayous, M.

AU - Gallais, Y.

AU - Measson, M. A.

AU - Lee, N.

AU - Cheong, Sang-Wook

AU - Sacuto, A.

PY - 2012/11/9

Y1 - 2012/11/9

N2 - Lattice and spin excitations have been studied by Raman scattering in hexagonal YbMnO 3 single crystals. The temperature dependences of the phonon modes show that the E 2 mode at 256 cm -1 related to the displacement of Mn and O ions in a-b plane is coupled to the spin order. The A 1 phonon mode at 678 cm -1 presents a soft mode behavior at the Néel temperature. Connected to the motion of the apical oxygen ions along the c direction, this mode controls directly the Mn-Mn interactions between adjacent Mn planes and the superexchange path. Crystal field and magnon mode excitations have been identified. The temperature investigation of the spin excitations shows that the spin structure is strongly influenced by the Yb-Mn interaction. Under a magnetic field along the c axis, we have investigated the magnetic reordering and its impact on the spin excitations.

AB - Lattice and spin excitations have been studied by Raman scattering in hexagonal YbMnO 3 single crystals. The temperature dependences of the phonon modes show that the E 2 mode at 256 cm -1 related to the displacement of Mn and O ions in a-b plane is coupled to the spin order. The A 1 phonon mode at 678 cm -1 presents a soft mode behavior at the Néel temperature. Connected to the motion of the apical oxygen ions along the c direction, this mode controls directly the Mn-Mn interactions between adjacent Mn planes and the superexchange path. Crystal field and magnon mode excitations have been identified. The temperature investigation of the spin excitations shows that the spin structure is strongly influenced by the Yb-Mn interaction. Under a magnetic field along the c axis, we have investigated the magnetic reordering and its impact on the spin excitations.

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