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Asai, Shinichiro*; Okazaki, Ryuji*; Terasaki, Ichiro*; Yasui, Yukio*; Kobayashi, Wataru*; Nakao, Akiko*; Kobayashi, Kensuke*; Kumai, Reiji*; Nakao, Hironori*; Murakami, Yoichi*; et al.
Journal of the Physical Society of Japan, 82(11), p.114606_1 - 114606_6, 2013/11
Times Cited Count:6 Percentile:43.31(Physics, Multidisciplinary)Neutron and synchrotron X-ray diffraction for LaCo Rh
O
have been carried out in order to investigate the structural properties related with the spin state of Co
ions. We have found that the values of the Co(Rh)-O bond lengths in the Co(Rh)O
octahedron of LaCo
Rh
O
are nearly identical at 10 K. The lattice volume for the Rh
substituted samples decreases with the thermal expansion coefficient similar to that of LaCoO
from room temperature, and ceases to decrease around 70 K. These experimental results favor a mixed state consisting of the high-spin state and low-spin state Co
ions, and suggest that the high-spin state Co
ions are thermally excited in addition to those pinned by the substituted Rh
ions.