摘要: In this work, we successfully synthesize the single crystal Cr11Ge19. The magnetism of the noncentrosymmetric
Cr11Ge19 with itinerant ferromagnetic ground state is thoroughly investigated on
the single crystal. Based on the variation measurements including the angular rotation, temperature,
and magnetic field dependence of magnetization, we find that this material exhibits strong
magnetic anisotropy along the c-axis. To clearly reveal the magnetic interactions, the critical behavior
is studied using the modified Arrott plot, the Kouvel-Fisher method, and the critical isotherm
technique. Combining these different methods, three main critical exponents (β, γ, and δ) are
obtained. The critical exponent β is close to the theoretical prediction of a three-dimensional XY
model with spin-dimensionality n = 2, indicating two-dimensional magnetic coupling. Meanwhile,
the critical exponent γ suggests that the magnetic interaction is of long-range type with magnetic
exchange distance decaying as J(r) #25; r−4:61. We propose that the ferromagnetic ground state
of Cr11Ge19 is formed by the polarized magnetic moments along the c-axis, while the long-range
magnetic coupling is established within the ab plane.