Phenomena of elementary excitation in rear-earth materials under pressure, magnetic field at low temperatures

稀土材料在低温压力、磁场下的基元激发现象

基本信息

批准号：
10440104
负责人：
MORI Nobuo
金额：
$ 8.26万
依托单位：
Saitama University (2001)The University of Tokyo (1998-2000)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

项目摘要

The purpose of this project is to search various materials that include charge fluctuating rare-earth elements for unusual phenomena under high pressure and high magnetic field at low temperatures.1. A high pressure apparatus for in-situ X-ray diffraction and electrical resistance measurements was developed using cubic anvils, which works at low temperatures from 300 K down to 7K under pressure of 10GPa.2. Hydrostatic and uniaxial pressure apparatuses combined with a SQUID magnetometer were made for magnetization measurements under pressure. Those work from 300K to 1.5K under pressure up to 1GPa and 0.5GPa, respectively.3. A technique for precise magneto-transport measurements at low temperatures under pressure up to 8GPa was established by applying a modified Bridgman anvil.4. A technique for XAFS under high pressure was developed for measurements of valence transition using a conventional X-ray generator combined with diamond anvils.5. By using above mentioned apparatus, we observed many unprecedented phenomena in the transport and magnetic properties of various materials, which include one of rare-earth elements, Ce, Pr, Eu, Sm, Tm, Yb and Lu, as follows : CeP, Ce_<0.9>La_<0.1>P, CeP_<0.9>N_<0.1>, Ce_2Fe_<17>, CePtGa, Ces_3SnC, Ce_3PbC, Ce_3Pd_<20>Si_6, Ce_<0.5>La_<0.5>B 6, CeNi, CeSbNi_x, PrInAg_2, PrCu_2, EuNi_2(Ge_<1-X>Si_x)_2, SmS, TmTe, TmSe, YbAs, YbInCu_4, Yb_4As_3, Yb_4(As_<1-x>Sb_x)_3, Lu(Co_<1-X>Al_x)_2.

该项目的目的是搜索各种材料，包括在高温下高压和高磁场下的电荷波动稀土元件的波动稀土元素。1。使用立方铁砧开发了用于原位X射线衍射和电阻测量的高压设备，该弧形在低温下在300 K下降到7K的低温下，在10GPA.2的压力下起作用。在压力下，制造了静水压力和单轴压力设备与鱿鱼磁力计的结合进行磁化测量。在压力下，这些工作从300k到1.5K，分别为1GPA和0.5GPA。3。通过应用改良的Bridgman Anvil.4，建立了高温下低温下精确的磁通量测量的技术。使用常规的X射线发电机与钻石砧相结合，开发了高压下XAF的技术，用于测量价过渡。5。 By using above mentioned apparatus, we observed many unprecedented phenomena in the transport and magnetic properties of various materials, which include one of rare-earth elements, Ce, Pr, Eu, Sm, Tm, Yb and Lu, as follows : CeP, Ce_<0.9>La_<0.1>P, CeP_<0.9>N_<0.1>, Ce_2Fe_<17>, CePtGa, Ces_3SnC, CE_3PBC，CE_3PD_ <20> SI_6，CE_ <0.5> LA__ <0.5> B 6，CENI，CESBNI_X，PRINAG_2，PRCU_2，PRCU_2，EUNI_2，EUNI_2（GE__ <1-x> si__x） yb_4（as_ <1-x> sb_x）_3，lu（co_ <1-x> al_x）_2。