Use of Stevens coefficients for the prediction of magnetic transitions in pseudobinary R1xR(x)(2) alloys: Application to Tm1-xTbxAl(2)

Article

关键词: RARE-EARTH-METALS;    ELECTRONIC-STRUCTURE;    CRYSTAL;    SYSTEMS;    FIELD;   

DOI  :  10.1103/PhysRevB.83.134437

来源: SCIE

【 摘 要 】

Recent heat-capacity and low-field magnetic susceptibility measurements revealed unusual magnetic phenomena occurring in Er1-xRxAl2 systems (where R = Dy,Tb) in the vicinity of a magic concentration of x = 0.25. Empirically, such behavior was attributed to different shapes of the 4f charge densities of the R3+ ions, which are represented by the opposite signs of the second-order Stevens factors. Here we show that by using both the signs and magnitudes of the second-order Stevens factors, magnetic transitions can be predicted in a broader range of pseudobinary R1-xRx'Al-2 alloys, where R and R' are rare-earth metals that have opposite signs of second-order Stevens factors. The predictions have been verified using the Tm1-xTbxAl2 system as a model using x-ray diffraction, magnetic susceptibility, and heat-capacity measurements. First-principles calculations have also been performed to explore the behavior of the density of states near the Fermi level.

【 授权许可】

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