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Electron spin resonance of valence fluctuating compounds.

价态波动化合物的电子自旋共振。

基本信息

批准号：
63540240
负责人：
CHIBA Yoshiaki
金额：
$ 1.22万
依托单位：
Miyagi University of Education.
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540240/
关键词：
Electron spin resonance Valence fluctuating compounds High-magnetic field ESR Short range order g-shift Electron carrier High-Tc Disorder site ESR GdB_6

项目摘要

1. High-magnetic field ESR High-field ESR spectrometer system using pulse magnet in the Research Center for Extreme Materials, Osaka, University was made to investigate the disappearance of band gap of valence fluctuating compounds. The test investigation is the study of Copper sulfate pentahydrate CuSO_45H_2O. The temperature dependent exchange interaction J_<AB> is found. [J.Phys.Soc.Jpn.57(1988)4366] Now we are using the ESR system to study not only valence fluctuating compounds but also heavy fermion materials.2.ESR study of GdB_6 The ESR study of GdBe single crystal was done to compare with the RB_6 type valence fluctuation compounds. The paramagnetic resonance of Gd^<3+> and the antiferromagnetic resonance was observed.3.ESR Study of Nd_2CuO_4 Electron spin resonance of neodymium copper oxide Nd_2CuO_4 is investigated and broad resonance is observed below 30K. The resonance is attributed to the Nd spin and no resonance from Cu spin is found. The g-value is isotropic with the value of 0.85 above 10K which is not so far from Nd<^<3+> free ion value of 0.73. Below about 5K, however, the g-value decreases rapidly with decreasing temperature with a large angular dependence. Effect of the Nd-Cu interactions on the Nd spin is suggest. [J. Phys. Soc. Jpn. to be published.]4.ESR study of valence fluctuating compounds. ( before 1987) 1)Electron spin resonance of Eu and Gd ions in SmB_6. [J.Magn.Magn.Mater. 52(1985)271-274.] 2)Higher harmonic electron spin resonance of Eu^<2+> in SmB_6. [J.Phys.Soc. Jpn. 55(1986)43-46.] 3)Electron spin resonance of disordered Sm ions in SmB_6. [J.Phys. Soc. Jpn. 55(1986)3737-3740.]

1.大坂大学极端材料研究中心的脉冲磁铁高场ESR谱仪系统用于研究价态波动化合物的带隙消失。本文对五水硫酸铜CuSO_45H_2O进行了试验研究。[<AB>J.Phys.Soc.Jpn.57（1988）4366]目前我们不仅用ESR系统研究价涨落化合物，而且研究重费米子材料。2.GdB_6的ESR研究对GdBe单晶进行了ESR研究，并与RB_6型价涨落化合物进行了比较。3. Nd_2CuO_4的ESR研究研究了钕铜氧化物Nd_2CuO_4的电子自旋共振，在30 K以下观察到宽共振。g值是各向同性的，在10 K以上的值为0.85，这与Nd ^（3+）自由离子值0.73相差不远。然而，低于约5 K时，g值随着温度的降低而迅速减小，具有大的角度依赖性。提出了Nd-Cu相互作用对Nd自旋的影响。[J.日本物理学会待公布]。4.价态涨落化合物的ESR研究。（1987年以前）1）SmB_6中Eu和Gd离子的电子自旋共振。[J. Magn. Magn. Mater. 52（1985）271-274.] 2)SmB_6中Eu^<2+>的高次谐波电子自旋共振[J. Phys. Soc. Jpn. 55（1986）43-46.] 3)SmB_6中无序Sm离子的电子自旋共振[J.Phys. Soc. Jpn. 55（1986）3737-3740.]