The pseudogap and anisotropic thermal expansion in RMn(4)Al(8) (R = La,Y,Lu and Sc)

Y Muro; H Nakamura; T Kohara

doi:10.1088/0953-8984/18/16/003

The pseudogap and anisotropic thermal expansion in RMn(4)Al(8) (R = La,Y,Lu and Sc)

J Phys Condens Matter. 2006 Apr 26;18(16):3931-6. doi: 10.1088/0953-8984/18/16/003. Epub 2006 Apr 3.

Authors

Y Muro¹, H Nakamura, T Kohara

Affiliation

¹ Graduate School of Material Science, University of Hyogo, Kamigori, Ako-gun, Hyogo 678-1297, Japan.

PMID: 21690749
DOI: 10.1088/0953-8984/18/16/003

Abstract

The temperature dependence of the magnetic susceptibility shows a broad maximum at ∼550 and 630 K for LuMn(4)Al(8) and ScMn(4)Al(8), respectively, which can be interpreted as due to the presence of a pseudogap in the effective bands as in LaMn(4)Al(8) and YMn(4)Al(8). The anisotropic thermal expansion observed for RMn(4)Al(8) (R = La, Y, Lu and Sc) and the sensitive volume dependence of the gap width throughout the RMn(4)Al(8) system suggest dominant magnetic coupling in Mn spin chains along the c axis.