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Quasiquartet crystal-electric-field ground state with possible quadrupolar ordering in the tetragonal compound YbRu_2Ge_2

机译:四方化合物YbRu_2Ge_2中可能具有四极有序的准四方晶体电场基态

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We have investigated the magnetic properties of YbRu_2Ge_2 by means of magnetic susceptibility χ(T), specific heat C(T) and electrical resistivity ρ(T) measurements performed on flux-grown single crystals. The Curie-Weiss behavior of χ(T) along the easy plane, the large magnetic entropy at low temperatures and the weak Kondo-like increase in ρ(T) proves a stable trivalent Yb state. Anomalies in C(T), ρ(T), and χ(T) at T_0 = 10.2 K, T_1 = 6.5 K, and T_2 = 5.7 K evidence complex ordering phenomena. The magnetic entropy just above T_0 amounts to almost R ln 4, indicating that the crystal-electric-field (CEF) ground state is a quasiquartet instead of the expected doublet. The behavior at T_0 is rather unusual and suggests that this transition is related to quadrupolar ordering, being a consequence of the CEF quasiquartet ground state. The combination of a quasiquartet CEF ground state, a high ordering temperature, and the relevance of quadrupolar interactions makes YbRu_2Ge_2 a rather unique system among Yb-based compounds.
机译:通过磁化率χ(T),比热C(T)和电阻率ρ(T)对通量生长的单晶进行测量,我们研究了YbRu_2Ge_2的磁性。沿着易平面的χ(T)的居里-魏斯行为,低温下的大磁熵和ρ(T)的弱Kondo类增加证明了稳定的三价Yb状态。 T_0 = 10.2 K,T_1 = 6.5 K和T_2 = 5.7 K时C(T),ρ(T)和χ(T)的异常证明了复杂的有序现象。刚好在T_0之上的磁熵几乎等于R ln 4,表明晶体电场(CEF)基态是准四重峰,而不是预期的二重峰。 T_0处的行为非常不寻常,表明此过渡与四极有序有关,这是CEF准四方基态的结果。准四方CEF基态,高有序温度以及四极相互作用的相关性使YbRu_2Ge_2成为基于Yb的化合物中相当独特的系统。

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