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

TitleUse of Stevens coefficients for the prediction of magnetic transitions in pseudobinary R1xR(x)(2) alloys: Application to Tm1-xTbxAl(2)
Publication TypeJournal Article
Year of Publication2011
AuthorsKhan M, Paudyal D, Mudryk Y, Gschneidner KA, Pecharsky VK
Journal TitlePhysical Review B
Volume83
Pages134437
Date Published04
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000292145000003
Keywordscrystal, electronic-structure, field, rare-earth-metals, systems
Abstract

Recent heat-capacity and low-field magnetic susceptibility measurements revealed unusual magnetic phenomena occurring in Er(1-x)R(x)Al(2) 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 R(3+) 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 R(1-x)R(x)'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 Tm(1-x)Tb(x)Al(2) 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.

DOI10.1103/PhysRevB.83.134437
Alternate JournalPhys. Rev. B