Critical Crossover Between Yosida-Kondo Dominant Regime and Magnetic   Frustration Dominant Regime in the System of a Magnetic Trimer on a Metal   Surface
  Quantum Monte Carlo simulations were carried out for the system of a magnetic trimer on a metal surface. The magnetic trimer is arranged in two geometric configurations, viz., isosceles and equilateral triangles. The calculated spectral density and magnetic susceptibility show the existence of two phases: Yosida-Kondo dominant phase and magnetic frustration dominant phase. Furthermore, a critical transition between these two phases can be induced by changing the configuration of the magnetic trimers from isosceles to equilateral triangle. 
Nghiem Thi Minh Hoa, Wilson Agerico Di\~no, and Hideaki Kasai
cond-mat.mtrl-sci