Solid State Physics Research with Pulsed Muons

在本赠款的帮助下，在位于KEK.1的东京大学介子科学实验室的脉冲μ子设施上，利用μ SR方法进行了固态物理研究，取得了以下研究成果。重费米子系统室兰工业大学（S.Murayama，et.al.）和大坂大学小组（T.宫古等人）分别在CeRuRhSi和CeLaRuSi中成功观察到了自旋密度波现象.福井大学（M.Mekata，et.al.）和御茶之水大学研究组（A.Ito，et.al.）FeMnTiO_3等。3.固体氢中的μ子分子东京工业大学研究小组（N.Nishida，et.al.）在固体H_2和D_24中观察到（H_2 μ ^+）分子的存在及其特征自旋弛豫。半金属Sb中的μ子态在有限的温度范围内观察到Sb中的μ ^+的顺磁状态。光照下Si中的μ子态RIKEN小组（R.Kadono，et.al.）用μ SR方法在有光照和无光照条件下揭示了Si中μ介子键合态的存在，这可以解释氢钝化的一个基本过程.超慢μ ^+束流的产生用500 MeV质子束在热钨表面产生热μ ~+的激光共振电离方法，实现了eV-keV慢μ ^+束流的全产生。从500 A Au薄层中观察到μ SR信号。

With the aid of the present Grant, the following research outputs have been obtained on solid state physics research with mu SR methods at the pulsed muon facility of the Meson Science Laboratory of the University of Tokyo located at KEK.1. Heavy Fermion SystemBoth rhe Muroran Institute of Technology group (S.Murayama, et.al.) and the Osaka University group (T.Miyako, et.al.) have successfully observed SDW (spin density wave) phenomenon in CeRuRhSi and CeLaRuSi, respectively.2. Flustrating Magnetic SystemSpin dynamics in flustrating magnetic system has been probed by the Fukui University group (M.Mekata, et.al.) on FeI_2, and by the Ochanomizu University group (A.Ito, et.al.) on FeMnTiO_3, etc..3. Muon Molecule in Solid HydrogenThe Tokyo Institute of Technology group (N.Nishida, et.al.) has observed an existence as well as a characteristic spin relaxation of (H_2mu^+) molecule in solid H_2 and D_24. Muon State in Semi-metallic SbThe Yamanashi University group (E.Torikai, et.al.) has observed a paramagnetic state of mu^+ in Sb at a limited temperature range.5. Muon State in Si under IlluminationThe RIKEN group (R.Kadono, et.al.) has revealed an existence of the muon bonding state in Si by the mu SR method with and without illumination, which may explain a fundamental process of hydrogen passivation.6. Generation of Ultra-slow mu^+ beamSuccessfull generation was made for eV-keV slow mu^+ by laser resonant ionization method of thermal muonium produced from hot tungsten surface placed at 500 MeV proton beam. The mu SR signal was seen from thin layer of 500A Au.