Abstract
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) ≈ 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.
Highlights
Density of states has suggested it to be an itinerant ferromagnet with low magnetic moment[23]
TC is difficult to be determined from magnetism because it is usually dependent on the external field
The magnetism of Cr11Ge19 has been thoroughly investigated on single crystal
Summary
Density of states has suggested it to be an itinerant ferromagnet with low magnetic moment[23]. Recent studies have manifested that Cr11Ge19 displays complex itinerant ferromagnetism. The magnetic behavior cannot be explained by the Stoner model which is a conventional theory describing the itinerant ferromagnet[24]. Both the experimental results and calculations have indicated that Cr11Ge19 is a good example of an itinerant electron ferromagnet, with signatures of spin wave excitation and magnetic fluctuation[24]. We successfully synthesize the single crystal Cr11Ge19. The magnetism of Cr11Ge19 on the single crystal is investigated. The study of critical behavior suggests that the magnetic interaction is of long-range type with two-dimensional magnetic coupling
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