2009 Fiscal Year Final Research Report
"Anomarous" extraordinary Hall effect in ruthenium oxides
| Project/Area Number |
19740203
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Tokyo Medical University (2008-2009)
The University of Electro-Communications (2007) |
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Principal Investigator |
KOBAYASHI Yoshihiko Tokyo Medical University, 医学部, 講師 (60293122)
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| Project Period (FY) |
2007 – 2009
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| Keywords | 強相関電子系 / ペロブスカイト型ルセニウム酸化物 / 磁性・電子輸送現象 / 異常ホール効果 / 結晶構造変化 |
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| Research Abstract |
We have investigated the extraordinary Hall effect of Ba_<1-x>Sr_xRuO_3 with x = 1 and 0.8. For x = 1, extraordinary Hall coefficient Rs can be interpreted by the skew scattering mechanism in the paramagnetic region above about 160 K and by the combination of the skew and the side-jump scattering mechanisms in the ferromagnetic region above about 60 K, which means that the mechanism of the extraordinary Hall effect in the system is basically the same as that of the ordinary ferromagnetic metals. Below 60 K, the extraordinary Hall resistivity ρH shows an anomalous field dependence at intermediate field region. The deviation from the linear relation in Rs/ρ versus ρ was also observed below 60 K, which suggests that the coefficients a and b of the skew and the side-jump scattering depends on both temperature and field below 60 K. No anomalies both in the temperature and the field dependence below 60 K were observed in the sample with x = 0.8. According to the structural analysis of the samples, we infer that the modulation of the Fermi surface due to the structural change plays an important roll on the anomaly of the extraordinary Hall effect for x = 1.
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[Journal Article] Electronic structure of La1-xPrxCoO3 and NdCoO3 studied by photoemission spectroscopy2007
Author(s)
T. Saitoh, D. Ishii, A. Hachimura, M. Hirose, Thant Sin Naing, Y. Kobayashi, K. Asai, M. Nakatake, M. Higashiguchi, K. Shimada, H. Namatame, M. Taniguchi
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Journal Title
J. Magn. & Magn. Mater. 310
Pages: 981-983
Peer Reviewed
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[Presentation] 二重ペロブスカイト型Co酸化物の光電子分光2009
Author(s)
西村淳一, 齋藤智彦, 小林義彦, 浅井吉蔵, 浜田典昭, 仲武昌史, 姜健, 島田賢也, 生天目博文, 谷日雅樹, 上田茂典, 山下良之, 吉川英樹, 小林啓介
Organizer
2009年9月27日2009年秋季大会
Place of Presentation
熊本大
Year and Date
2009-09-27
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