Magnetic ordering in the pressure-stabilized high-temperature phase of YbInCu4
Magnetic ordering in the pressure-stabilized high-temperature phase of YbInCu4
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DOI：
10.1103/physrevb.67.224409
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发表时间：
2003-06
影响因子：
3.7
通讯作者：
T. Mito;T. Koyama;M. Shimoide-;S. Wada;T. Muramatsu;Tatsuya Kobayashi;J. Sarrao
中科院分区：
文献类型：
--
作者：
T. Mito;T. Koyama;M. Shimoide-;S. Wada;T. Muramatsu;Tatsuya Kobayashi;J. Sarrao
为了阐明YbInCu4的压稳高温相的基态，我们在高压下进行了电阻率p和交流磁化率Χa c的测量。当压力高于2.49 GPa时，一级价态转变被完全抑制(低于∼80MK)。另外，在2.39 Gpa以上，Χa_c出现一个明显的峰，在T_Μ=2.4K附近，p有一个小的拐点。Χ_a_c峰很容易被低磁场所减弱，在∼_(500)Oe以上消失。Χa c在T M的特征行为一般可以归因于长程铁磁有序的开始，因此，压力稳定的HT相的基态最有可能是铁磁有序态。这一结果与最近报道的Y取代化合物Yb0的弱铁磁性的发生是一致的。8 Y 0。2 InCu4，加压1.2 Gpa。
To elucidate the ground state of the pressure-stabilized high-temperature (HT) phase of YbInCu 4 , we have carried out electrical resistivity p and ac-susceptibility Χ a c measurements at high pressures. For pressures above 2.49 GPa, the first-order valence transition is completely suppressed (below ∼80 mK). Separately, above 2.39 GPa, a clear peak appears in Χ a c with a small kink in p at around T Μ =2.4 K. The Χ a c peak is easily diminished by applying low magnetic fields and disappears above ∼500 Oe. The characteristic behavior of Χ a c at T M can generally be ascribed to the onset of long-range ferromagnetic ordering and, therefore, the ground state of the pressure-stabilized HT phase is most probably a ferromagnetically ordered state. This result is compatible with the occurrence of weak ferromagnetism recently reported for the Y-substituted compound Yb 0 . 8 Y 0 . 2 InCu 4 under pressure of 1.2 GPa.