EFFECT OF HIGH PRESSURE ON THE ELECTRICAL AND MAGNETIC PROPERTIES OF CERIUM-PNICTIDES AT LOW TEMPERATURE

本项目的目的是弄清具有NaCl型晶体结构的铈-石榴皮酸盐在高压下的电磁性质。这两年取得的成果如下。测量了这些化合物在4.2 - 300 K温度和压力下的电阻率，压力可达8 GPa。测量了CeP在1GPa.3压力下的磁化率。测量了CeP在0.5GPa压力下的热容。获得了CeBi和CeSb的室温磁相图。提出了CeP的磁性和电子相图.测量了CeAs和CeSb在磁场下的电阻率。观察到LaSb和CeAs的Shubnikov DE哈斯信号. CeSb的电阻率在30 K附近的压力下出现异常增强。我们测量了CeP和CeAs的磁结构和晶场分裂的压力效应，并在日本物理学会、日本高压科学技术学会、仙台强关联电子系统国际会议和京都第五届半导体物理高压国际会议上作了报告。这些结果也将作为特邀论文在科罗拉多州的高压科学和技术的airapt会议上报告。

THE PURPOSE OF THIS PROJECT IS TO MAKE CLEAR THE ELECTRICAL AND MAGNETIC PROPERTIES OF CERIUM-PNICTIDES HAVING NACL-TYPE CRYSTAL STRUCTURE UNDER HIGH PRESSURE. RESULTS OBTAINED FOR THESE TWO YEARS ARE AS FOLLOWS.1. THE ELECTRICAL RESISTIVITY OF THESE COMPOUNDS WERE MEASURED UNDER PRESSURE UP TO 8GPa AND AT TEMPERATURE FROM 4.2K TO 300K.2. MAGNETIC SUSCEPTIBILITY WAS MEASURED FOR CeP UNDER PRESSURE UP TO 1GPa.3. HEAT CAPACITY WAS MEASURED FOR CeP UNDER PRESSURE UP TO 0.5GPa.4. PRESSURE-TEMPERATURE MAGNETIC PHASE DIAGRAM WAS OBTAINED FOR CeBi AND CeSb. FOR CeP MAGNETIC AND ELECTRONIC PHASE DIAGRAM WAS PROPOSED.5. ELECTRICAL RESISTIVITY UNDER MAGNETIC FIELD WAS MEASURED FOR CeAs AND CeSb.6. THE SHUBNIKOV DE HAAS SIGNALS OF LaSb AND CeAs WERE OBSERVED.7. ANOMALOUS ENHANCEMENT OF THE RESISTIVITY OF CeSb WAS INDUCED UNDER PRESSURE NEAR 30K.8. EFFECTS OF PRESSURE ON THE MAGNETIC STRUCTURE AND THE CRYSTALLINE FIELD SPLITTING OF CeP AND CeAs ARE NOW MEASURED.THESE RESULTS WERE REPORTED AT CONFERENCES OF THE PHYSICAL SOCIETY OF JAPAN, THE JAPAN SOCIETY OF HIGH PRESSURE SCIENCE AND TECHNOLOGY, AND INTERNATIONAL CONFERENCE OF STRONGLY CORRELATED ELECTRON SYSTEMS HELD AT SENDAI, AND 5TH INTERNATIONAL CONFERENCE OF HIGH PRESSURE IN SEMICONDUCTOR PHYSICS HELD AT KYOTO. THESE RESULTS WILL BE ALSO REPORTED AS AN INVITED PAPER AT AIRAPT CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY AT COLORADO.