SrMn$_2$Ge$_2$: A metallic system with anomalous magnetotransport properties

A. van der Spuy; R. Warmbier; A. M. Strydom; Daniel Wamwangi; Abhishek Pandey

doi:10.1039/d6tc01028h

paper

SrMn $_{2}$ Ge $_{2}$ : A metallic system with anomalous magnetotransport properties

arXiv:2611.04984 · doi:10.1039/d6tc01028h

Abstract

The structural, electronic, and physical properties of previously unexplored layered tetragonal compound SrMn $_{2}$ Ge $_{2}$ are reported. The compound crystallizes in the ThCr $_{2}$ Si $_{2}$ -type structure with a crystallographic parameters $c / a$ ratio of $2.535 (3)$ , significantly smaller than those of the related BaMn $_{2}$ $P n_{2}$ compounds ( $P n =$ P, As, Sb, Bi), indicating enhanced interlayer interaction between the moment-bearing Mn-ions. Magnetic susceptibility measurements suggest an antiferromagnetic ground state with a high Neél temperature $T_{N} > 350$ ~K\@. A large and positive magnetoresistance (MR) of approximately $50%$ is observed at low temperatures, which follows a power-law field dependence with exponent $n = 1.50 (8)$ . Low-temperature electrical resistivity data reveal Kondo-like features. Heat capacity measurements show no signs of a phase transition below 300~K and further confirm a metallic ground state. Electronic structure calculations reveal a three-dimensional Fermi surface and suggest the presence of substantial electronic correlation effects.

arXiv comment8 pages, 6 figures

SrMn2​Ge2​: A metallic system with anomalous magnetotransport properties

Abstract

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SrMn $_{2}$ Ge $_{2}$ : A metallic system with anomalous magnetotransport properties