TY - JOUR
T1 - Dynamic distortions in the YTiO3 ferromagnet
AU - Li, Bing
AU - Louca, Despina
AU - Hu, Biao
AU - Niedziela, Jennifer L.
AU - Zhou, Jianshi
AU - Goodenough, John B.
N1 - Publisher Copyright:
© 2014 The Physical Society of Japan.
PY - 2014/8/15
Y1 - 2014/8/15
N2 - The orbitally ordered YTiO3 ferromagnet is revisited to investigate the influence of local lattice dynamics on the magnetic transition. By probing the local lattice dynamics using inelastic neutron scattering and the dynamic pair density function (DPDF) analysis, we find that strong, local anharmonic fluctuations persist up to 60 meV. The spread in energy is expected of fluctuations that are well-defined in real-space. The anharmonicity is manifested in the form of a doublewell potential, where the spectral weight of the DPDF peak involving Y-O correlations shifts away from the central peak to two new peaks as a function of energy. This transition occurs around 40meV. The weight distribution between the two peaks is temperature dependent that corresponds to a change in the nature of the local modes. The anharmonicity in the Y-O local modes most likely affects the Ti orbital overlap leading to a temperature dependent spin disorder.
AB - The orbitally ordered YTiO3 ferromagnet is revisited to investigate the influence of local lattice dynamics on the magnetic transition. By probing the local lattice dynamics using inelastic neutron scattering and the dynamic pair density function (DPDF) analysis, we find that strong, local anharmonic fluctuations persist up to 60 meV. The spread in energy is expected of fluctuations that are well-defined in real-space. The anharmonicity is manifested in the form of a doublewell potential, where the spectral weight of the DPDF peak involving Y-O correlations shifts away from the central peak to two new peaks as a function of energy. This transition occurs around 40meV. The weight distribution between the two peaks is temperature dependent that corresponds to a change in the nature of the local modes. The anharmonicity in the Y-O local modes most likely affects the Ti orbital overlap leading to a temperature dependent spin disorder.
UR - http://www.scopus.com/inward/record.url?scp=84924942933&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.83.084601
DO - 10.7566/JPSJ.83.084601
M3 - Article
AN - SCOPUS:84924942933
SN - 0031-9015
VL - 83
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 8
M1 - 084601
ER -