Magnetic behavior of RMn2+xAl10-x (R=La,Gd) crystals

TitleMagnetic behavior of RMn2+xAl10-x (R=La,Gd) crystals
Publication TypeJournal Article
Year of Publication2007
AuthorsSefat AS, Li B, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Date PublishedNov
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000251326600081
Keywordsgd, LA-ND, mn, pr, rare-earth, RMN4AL8, single-crystals, SM, spin, TERNARY INTERMETALLIC COMPOUNDS

The crystallographic and magnetic properties of the solution grown RMn2+xAl10-x (R=Gd and La) crystals with tetragonal (P4/nmm) structure are investigated. For these, single-crystal x-ray diffraction results have shown the preferential occupation of excess manganese on the aluminum 8i crystallographic site. Due to excess Mn, there is evidence of local-moment magnetism in LaMn2+xAl10-x and their random distribution is thought to be responsible for the magnetic correlations below similar to 50 K and the spin-glass behavior below similar to 3 K. For GdMn2+xAl10-x, the extra manganese influences temperature below which the sample enters into a state with a net ferromagnetic component: T-C approximate to 16 K for GdMn2.21(4)Al9.79(4) and 25.5 K for GdMn2.39(2)Al9.61(2). Assuming a linear dependence between T-C and excess Mn concentration, the fully stoichiometric and ordered GdMn2Al10 should have T-C approximate to 5 K.

Alternate JournalPhys. Rev. B