Magnetic phase diagram of CexLa1-xB6 studied by static magnetization measurement at very low temperatures
Magnetic phase diagram of CexLa1-xB6 studied by static magnetization measurement at very low temperatures
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通过极低温下静态磁化测量研究的 CexLa1-xB6 磁相图
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
S. Kunii
中科院分区：
文献类型：
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作者：
T. Tayama;T. Sakakibara;K. Tenya;H. Amitsuka;S. Kunii
在磁场H //[100]中，测量了Ce_xLa_（1- x）B_（6）（0.5≤ x ≤1）单晶的直流磁化强度，并给出了H-T- x相图。在零场下，反铁四极（AFQ）转变温度TQ随x的减小而迅速降低，并在x =0.75 ~ 0.7之间突然消失. Neel温度TN比CeB 6中的T Q低，随x的变化更慢，当x> 0.8时超过T Q。在磁化率中观察到的一个明显的峰强烈地表明，除了两个有序相II（AFQ）和III（AF+AFQ）之外，还存在一个新的反铁磁（AF）状态，其没有AFQ矩（相IV）。随着H的增加，观察到一阶相IV-III转变与变磁性的磁化跳变。在H-T- x空间的一个非常窄的区域内可以观察到连续的I（顺磁）-IV-III相变。
DC magnetization of single crystals of Ce x La 1- x B 6 , 0.5≤ x ≤1, have been measured at low temperatures ( T ) down to 40 mK in magnetic field H //[100], and the H - T - x phase diagrams were obtained. At zero field, the antiferro-quadrupolar (AFQ) transition temperature T Q rapidly decreases with decreasing x and vanishes abruptly between x =0.75 and 0.7. The Neel temperature T N , which is lower than T Q in CeB 6 , varies more slowly with x and exceeds T Q for (x gtrsim 0.8). A clear peak observed in the susceptibility strongly suggests that a new antiferromagnetic (AF) state having no AFQ moment (phase IV) exists for (0.8gtrsim xgtrsim 0.5), in addition to the two ordered phases II (AFQ) and III (AF+AFQ). As H increases, a first-order phase IV-III transition is observed with a metamagnetic jump in the magnetization. Successive I (paramagnetic)-IV-III phase transitions are observable in a very narrow region of the H - T - x space.