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Effect of Pressure on the Field-induced Ordered Phase in the Heavy-fermion Compound YbCo2Zn20
Tetsuya Takeuchi,Yuki Taga,Shingo Yoshiuchi,Masahiro Ohya,Yusuke Hirose,Fuminori Honda,Rikio Settai,Yoshichika Onuki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The effect of pressure on the field-induced ordered phase for H k h111i in the heavy-fermioncompound YbCo2Zn20, which is presumably a field-induced antiferro-quadrupolar (FI-AFQ) phase,was investigated in the pressure range up to 4.5 GPa and under magnetic fields up to 80 kOe. When pressure is applied, the metamagnetic-like transition at Hm =6 kOe shifts to lower fieldsand disappears around the quantum critical pressure Pc 1.8 GPa. A pressure-induced antiferromagnetic(PI-AFM) phase appears at pressures above about 2 GPa, and the critical field Hc ofthe PI-AFM phase increases with increasing pressure. On the other hand, the transition field HQof the FI-AFQ phase decreases gradually without showing any anomalous behavior around Pc andbecomes obscure around 4 GPa, where Hc of the PI-AFM phase and HQ of the FI-AFQ phasebecome comparable. The magnetic field versus pressure, H-P, phase diagram for H k h111i at0.1 K was constructed in the pressure range up to 4.5 GPa.