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

Date
2007-11-12
Authors
Sefat, Athena
Li, Bin
Bud'ko, Sergey
Canfield, Paul
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Ames Laboratory
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Abstract

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 ∼50K and the spin-glass behavior below ∼3K. For GdMn2+xAl10−x, the extra manganese influences temperature below which the sample enters into a state with a net ferromagnetic component: TC≈16K for GdMn2.21(4)Al9.79(4) and 25.5K for GdMn2.39(2)Al9.61(2). Assuming a linear dependence between TC and excess Mn concentration, the fully stoichiometric and ordered GdMn2Al10 should have TC≈5K.

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This article is from Physical Review B 76 (2007): 174419, doi:10.1103/PhysRevB.76.174419. Posted with permission.

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Chemistry, Physics and Astronomy
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