论文标题
等值u $ tx $化合物的不同通用类（$ t $ = rh，co，co $ _ {0.98} $ ru $ $ _ {0.02} $; $ x $ = ga，al）
Different universality classes of isostructural U$TX$ compounds ($T$ = Rh, Co, Co$_{0.98}$Ru$_{0.02}$; $X$ = Ga, Al)
论文作者
论文摘要
在其居里温度附近的温度下测量了5F-电子铁磁体URHGA，UCOGA和UCO0.98RU0.02AL的磁化等温度，以调查铁磁相变变附近的关键行为。这些化合物采用了层状的六边形Zrnial型结构，并表现出巨大的单轴磁晶型各向异性。通过分析Arrott-Noakes图，Kouvel-Fisher图，临界等温线，缩放理论和Widom缩放关系来确定临界\ B {ETA}，γ和δ指数。对于2D ISING系统，具有与其他研究者报道的URHAL相似的远程相互作用的2D ISING系统的结果可以通过重新归一化组理论的结果来解释URHGA和UCOGA获得的值。另一方面，针对UCO0.98RU0.02AL确定的临界指数是3D Ising Ferromagnet的特征，在先前的研究中也针对静止的5F-Electron Paramagnet Ucoal提出了短距离相互作用，该研究位于铁磁过渡附近。从2d到3D ISING系统的变化与在URHGA，URHAL，UCOGA系列中的5F电子的逐渐脱位有关，再到UCO0.98RU0.02AL和UCOAL化合物，并且似乎靠近强烈的非磁性限制。这表明可能是由于量子临界点附近的维数的变化而引起的可能的新现象。
Magnetization isotherms of the 5f-electron ferromagnets URhGa, UCoGa and UCo0.98Ru0.02Al were measured at temperatures in the vicinity of their Curie temperature in order to investigate the critical behavior near the ferromagnetic phase transition. These compounds adopt the layered hexagonal ZrNiAl-type structure and exhibit huge uniaxial magnetocrystalline anisotropy. The critical \b{eta}, γ and δ exponents were determined by analyzing Arrott-Noakes plots, Kouvel-Fisher plots, critical isotherms, scaling theory and Widom scaling relations. The values obtained for URhGa and UCoGa can be explained by the results of the renormalization group theory for a 2D Ising system with long-range interactions similar to URhAl reported by other investigators. On the other hand, the critical exponents determined for UCo0.98Ru0.02Al are characteristic of a 3D Ising ferromagnet with short-range interactions suggested in previous studies also for the itinerant 5f-electron paramagnet UCoAl situated near a ferromagnetic transition. The change from the 2D to the 3D Ising system is related to the gradual delocalization of 5f electrons in the series of the URhGa, URhAl, UCoGa to UCo0.98Ru0.02Al and UCoAl compounds and appears close to the strongly itinerant nonmagnetic limit. This indicates possible new phenomena that may be induced by the change of dimensionality in the vicinity of the quantum critical point.
