Pressure-Induced Valence Crossover and Novel Metamagnetic Behavior near the Antiferromagnetic Quantum Phase Transition of YbNi3Ga9
Pressure-Induced Valence Crossover and Novel Metamagnetic Behavior near the Antiferromagnetic Quantum Phase Transition of YbNi3Ga9
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DOI：
10.1103/physrevlett.114.086401
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发表时间：
2015-02-24
影响因子：
8.6
通讯作者：
Uwatoko, Y.
中科院分区：
文献类型：
--
作者：
Matsubayashi, K.;Hirayama, T.;Uwatoko, Y.
我们报告了压力和磁场下中间价 YbNi3Ga9 的电阻率、交流磁化率和 X 射线吸收光谱测量。我们在温度-压力相图中揭示了压力诱导的 Yb 价态交叉特征，并且在 P-c 以下发现了类似于 9 GPa 的一阶变磁转变，其中系统经历了压力诱导的反铁磁转变。作为变磁行为的可能起源，在温度-场-压力相图的基础上讨论了在一级价态跃迁临界点附近出现的临界价态涨落。
We report electrical resistivity, ac magnetic susceptibility, and x-ray absorption spectroscopy measurements of intermediate valence YbNi3Ga9 under pressure and magnetic field. We have revealed a characteristic pressure-induced Yb valence crossover within the temperature-pressure phase diagram, and a first-order metamagnetic transition is found below P-c similar to 9 GPa where the system undergoes a pressure-induced antiferromagnetic transition. As a possible origin of the metamagnetic behavior, a critical valence fluctuation emerging near the critical point of the first-order valence transition is discussed on the basis of the temperature-field-pressure phase diagram.