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

本项目的目的是为了弄清具有NaCl型晶体结构的稀土化合物在高压下的电磁性质。这两年所取得的成果如下1.这些化合物的电阻率是在4.2K到300K的压力和温度下测量的。测量了CEP在压力高达1 GPa时的磁化率。测量了CEP在0.5GPa.4压力下的热容。得到了CeBi和CeSb的压力-温度磁相图。对于CEP，给出了磁相图和电子相图。测量了CeAs和CeSb.6在磁场下的电阻率。LaSb和CEAS的SHUBNIKOV de Haas信号均为OBSERVED.7。在30K.8附近的压力下，CESb的电阻率出现了反常的增强。本文报道了压力对CEP和CEAS的磁结构和晶场分裂的影响。这一结果是在日本物理学会、日本高压科学技术学会、在仙台举行的强关联电子系统国际会议和在京都举行的第五届国际半导体高压物理会议上报道的。这些结果也将作为特邀论文在科罗拉多州的AIRAPT高压科学和技术会议上发表。

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.