Local fields in a colossal magnetoresistive manganite observed by a nuclear technique

通过核技术观察到的巨大磁阻锰矿中的局部场

• 批准号: 20612005
• 负责人: SATO Wataru
• 金额: $ 3万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20612005/
• 关键词: 超微細相互作用; 超巨大磁気抵抗; RIビーム; 摂動角相関; ペロブスカイト; マンガン酸化物; γ線摂動角相関; ペロフスカイト; 核物性; マンガナイト

Perovskite manganese oxides are known to exhibit the effect of colossal magnetoresistance, a phenomenon that electrical resistivity undergoes a drastic change at the transition temperature. Because of this unique physical property, much attention has been given to these oxides aiming at wide industrial applications. In order to realize practical use of these compounds, it is of importance to obtain information on local fields in the material as well as macroscopic quantities such as resistivity and magnetization. From this point of view, we have applied the time-differential perturbed angular correlation (TDPAC) method to a study of a perovskite La_<0.7>Ca_<0.3>MnO_3 (T_c～245K). The TDPAC spectra show that Ce ions introduced into the La (Ca) site as impurities feel transferred field from Mn ions, whereas no internal field impinges on Cd ions at the substitutional La (Ca) site. These observations suggest that the magnetic field on the Ce nucleus arises from the spin polarization of a 4f electron as in the trivalent state.

众所周知，过氧化锰氧化物表现出庞磁阻效应，这是一种电阻率在转变温度下发生剧烈变化的现象。由于这种独特的物理性质，这些氧化物在工业上有着广泛的应用前景。为了实现这些化合物的实际应用，重要的是获得材料中的局部场以及宏观量（如电阻率和磁化强度）的信息。从这一观点出发，我们用时间微分扰动角关联（TDPAC）方法研究了钙钛矿结构的La_<0.7>Ca_<0.3>MnO_3（T_c~ 245 K）。TDPAC谱表明，Ce离子作为杂质引入到La（Ca）位时感受到来自Mn离子的转移场，而Cd离子在取代的La（Ca）位时没有内场作用.这些观测结果表明，Ce核上的磁场来自于三价态下4f电子的自旋极化。

项目成果

Anticoincidence measurement of Me^<57> mossbauer spectra obtained after Mn^<57> implantation : Apphcation to Fe in a-Al_2O_3

Mn^<57>注入后获得的Me^<57>穆斯堡尔谱的反符合测量：对a-Al_2O_3中Fe的应用

• 发表时间: 2010
• 期刊: Hyperfine Interactions
• 作者: Y.Kobayashi;et al.
• 通讯作者: et al.

ペロブスカイト型マンガン酸化物の超微細場測定

钙钛矿型锰氧化物的超精细场测量

• 发表时间: 2010
• 作者: 佐藤渉;南大地;長明彦;佐藤哲也;大久保嘉高
• 通讯作者: 大久保嘉高

Oxidation of element 102, Nobelium, with flow electrolytic column chromatography on an atom-at-a-time scale

使用流动电解柱色谱法在原子时间尺度上氧化 102 号元素（诺贝尔）

• 发表时间: 2009
• 期刊: J. Am. Chem. Soc
• 作者: Toyoshima;A.; Kasamatsu;Y.; Tsukada;K.; Asai;M.; Kitatsuji;Y.; Ishii;Y.; Toume;H.; Nishinaka;I.; Haba;H.; Ooe;K.; Sato;W.; Shinohara;A.; Akiyama;K.; Nagame;Y.
• 通讯作者: Y.

Temperature-dependent behavior of impurity atoms implanted in highly oriented pyrolytic graphite-An application of a new online TDPAC method

高取向热解石墨中杂质原子注入的温度依赖性行为——新型在线TDPAC方法的应用

• 发表时间: 2008
• 期刊: Journal of the Physical Society of Japan 77
• 作者: Wataru Sato;Hideki Ueno;Hiroshi Watanabe;Hisanori Miyoshi;Akihiro Yoshimi;Daisuke Kameda;Takashi Ito;Kenzi Shimada;Jou Kaihara;Shinichi Suda;Yoshio Kobayashi;Atsushi Shinohara;Yoshitaka Ohkubo;Koichiro Asahi
• 通讯作者: Koichiro Asahi

Electric field gradient at impurity sites in Ga-doped ZnO

Ga 掺杂 ZnO 中杂质位点的电场梯度

• 期刊: Radiochimica Acta in press.
• 作者: W.Sato;Y.Ohkubo;Y.Itsuki;S.Komatsuda;D.Minami;T.Kubota;S.Kawata;A.Yokoyama;T.Nakanishi
• 通讯作者: T.Nakanishi