准二维金属铁磁体LaCrSb3的类海森伯临界行为OA

LaCrSb3 is a material exhibiting both quasi-two-dimensional spin fluctuations and three-dimensional magnetic interaction characteristics.By measuring the isothermal magnetization of single-crystals and conducting a systematic critical behavior analysis,we clarify the critical properties of its ferromagnetic phase transition and the intrinsic magnetic interaction mechanism.Based on high-precision isothermal magnetization data measured in the vicinity of the critical point,the Curie temperature for the ferromagnetic-paramagnetic phase transition is determined to be TC=126 K,with the critical exponents obtained as b=0.376,g=1.417 and d=4.76 via the self-consistent iterative method based on the Arrott-Noakes equation.The reliability of these critical exponents is verified by the Widom scaling law,the magnetic state scaling equation and other analyses.A comparison with theoretical models demonstrates that the critical behavior of the magnetic phase transition in this system basically belongs to the universality class of the three-dimensional Heisenberg model.This conclusion is further confirmed by the distance-dependent decay behavior of the exchange interaction J(r),revealing the dominant role of isotropic direct exchange interactions in this system.Finally,drawing on research findings of other quasi-two-dimensional magnetic materials,this work proposes that LaCrSb3 may exhibit non-zero temperature magnetic order in the two-dimensional limit,thereby possessing important theoretical research significance and promising practical application prospects.