Detail:

Abstract:
　　Quantum phase transitions have attracted a great deal of interest in the study of condensed matter physics. Normally, this refers to continuous transitions that occur at T=0, where the correlation length and time scales diverge, and universal scaling is observed close to the Quantum Critical Point (QCP). Here I will talk about the search for quantum criticality in magnetic compounds: YFe₂Al₁₀ and Yb₂Pt₂Pb. In the transition metal YFe₂Al₁₀, strong divergence in magnetic susceptibility and magnetic specific heat was observed. Universal scaling was found in the magnetic susceptibility and specific heat. One the other hand, Yb₂Pt₂Pb is a one dimensional quantum magnet and spinons like excitations were observed in neutron scattering experiments.