Research of novel quantum criticality and frustration effect on lanthanide compounds

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This Research is about quantum critical point (QCP), which is the critical point caused by quantum fluctuation. We have used pressure and substitution of element as the method of approach to the QCPs. To obtain the information of quantum critical frustration, we have developed a handmade heat capacity measurement system. On the approach to the QCPs by pressure, an anomaly of electrical resistivity associated antiferromagnetic transition is found. On the approach to the QCPs by substitution of the element, we have succeed to make the single crystalline samples located at the vicinity of the QCP. the sample shows the logarithmic increase of the specific heat at low temperature region.