Research on Degree of Localization off-electrons in Uranium Monopnictides and Moncharcogenides

生长出以下单晶：1；采用高纯度金属铀、精确的化学计量控制和退火等方法制备了高质量的USb单晶。采用Bridgman技术生长了单晶。利用高纯度的Th金属生长出高质量的ThSb单晶，ThSb是USb的标准材料。用Bridgman法制备了从US到UTe的单碳属铀单晶。利用这些单晶得到了以下新结果：与ua和UP相比，USb的特征物理特性被认为是由于其半金属特性。利用磁和声的德哈斯效应，可以观测到椭球面费米面和球面费米面。USb在约40t的磁场下呈现磁相变。采用电阻率法和中子散射法观察了高压下USb的磁相变。UAs表现出与样品相关的输运特性。ThSb的共振比有了较大的提高，其德哈斯效应实验正在进行中。对UTe进行了x射线磁散射和磁康普顿散射实验，结果与我们的预期相反，它的5f轨道相当宽。美国和中国也在进行同样的实验。

Following single crystals were grown ;1.High quality single crystals of USb were obtained by using highly purified uranium metal, precise control of stoichiometry and annealing etc.2.Single crystal of UAs was grown by Bridgman technique.3.High quality single crystal of ThSb which is reference material of USb was grown using highly purified Th metal.4.Single crystals of uranium monocharcogenides from US to UTe were grown by Bridgman technique.Using these single crystalsfollowing new results were obtained ;1.Characteristic physical properties of USb compared to UAs and UP are considered to be due to its semimetallic character. Now by magnetic and acoustic de Haas effect two kind of ellipsoidal Femisurface and spherical Fermi surface are observed.2.USb shows magnetic phase transition by magnetic field of about 40T.3.Magnetic phase transition of USb under high pressure was observed by electric resistivity and neutron scattering measurement.4.UAs shows sample dependent transport property.5.The r.r.r.of ThSb is rather improved and its de Haas effect experiment is now in progress.X-ray magnetic scattering and magnetic Compton scattering experiments were performed for UTe, and contrary our expectation its 5f orbital is rather broad. Same experiments for US and USe are now in progress.