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Bizen, Daisuke*; Nakao, Hironori*; Iwasa, Kazuaki*; Murakami, Yoichi*; Osakabe, Toyotaka; Fujioka, Jun*; Yasue, Toshio*; Miyasaka, Shigeki*; Tokura, Yoshinori*
Journal of the Physical Society of Japan, 81(2), p.024715_1 - 024715_6, 2012/02
Times Cited Count:6 Percentile:42.8(Physics, Multidisciplinary)The magnetic phase diagrams for VO ( = Y, Tb) were determined by low temperature and high pressure neutron-diffraction techniques. We found that the magnetic ground state in TbVO changes from -type spin ordering (-SO) to -type spin ordering (-SO) on application of pressure. The transition of the magnetic ground state also indicates that the ground state of the orbital ordering changes from -type orbital ordering (-OO) to -type orbital ordering (-OO). In YVO, the -SO and -OO phases set in simultaneously up to 6.2 GPa, and the disorder-[-SO, -OO] phase transition appears above 6 GPa. This is the first observation of a simultaneous spin and orbital order-disorder phase transition in perovskite-type transition-metal oxides MO. The [-SO, -OO] phase is strongly stabilized with increasing pressure, and both the covalency effect and the superexchange interaction play roles in this stabilization.
Fujioka, Jun*; Yasue, Toshio*; Miyasaka, Shigeki*; Yamazaki, Yuichi*; Arima, Takahisa*; Sagayama, Hajime*; Inami, Toshiya; Ishii, Kenji; Tokura, Yoshinori*
Physical Review B, 82(14), p.144425_1 - 144425_12, 2010/10
Times Cited Count:54 Percentile:85.82(Materials Science, Multidisciplinary)