Avoided ferromagnetic quantum critical point in pressurized La${}_5$Co${}_2$Ge${}_3$

Abstract

We present the pressure-temperature phase diagram La${}_5$Co${}_2$Ge${}_3$ up to $\sim$ 5\,GPa, which was constructed from magnetization, resistivity and specific heat measurements. At ambient pressure, La${}_5$Co${}_2$Ge${}_3$ is an itinerant ferromagnet with a Curie temperature $T_{\text{C}}\sim$ 4\,K. Upon increasing pressure up to $\sim$ 1.7\,GPa, $T_{\text{C}}$ is suppressed down to $\sim$ 3\,K. Upon further increasing pressure, our results suggest that La${}_5$Co${}_2$Ge${}_3$ enters a different low-temperature ground state. The corresponding transition temperature, $T^{\ast }$, has a nonmonotonic pressure dependence up to $\sim$ 5\,GPa. Our results demonstrate that the ferromagnetic quantum critical point in La${}_5$Co${}_2$Ge${}_3$ is avoided by the appearance of a different, likely magnetically ordered state that has an antiferromagnetic component.

arXiv comment7 pages, 7 figures

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• Small moment antiferromagnetic ordering in single crystalline La2Ni7
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• Quantum critical point followed by Kondo-like behavior due to Cu substitution in itinerant, antiferromagnet ${\text{La}}_2{\text{(Cu}}_x{\text{Ni}}_{1-x}{)}_7$
• Effect of Ni substitution on the fragile magnetic system ${\text{La}}_5{\text{Co}}_2{\text{Ge}}_3$