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PreprintCC BY 4.0arXiv

SrMn2Ge2: A metallic system with anomalous magnetotransport properties

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

The structural, electronic, and physical properties of previously unexplored layered tetragonal compound SrMn2Ge2 are reported. The compound crystallizes in the ThCr2Si2-type structure with a crystallographic parameters c/a ratio of 2.535(3), significantly smaller than those of the related BaMn2Pn2 compounds (Pn = 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 TN > 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.

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Cite

BibTeXRIS
BibTeX
@misc{spuy2026srmn2ge2,
  title = {{SrMn$_2$Ge$_2$: A metallic system with anomalous magnetotransport properties}},
  author = {A. van der Spuy and R. Warmbier and A. M. Strydom and Daniel Wamwangi and Abhishek Pandey},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.04984},
  eprint = {2611.04984},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.04984},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - SrMn_2Ge_2: A metallic system with anomalous magnetotransport properties
AU  - A. van der Spuy
AU  - R. Warmbier
AU  - A. M. Strydom
AU  - Daniel Wamwangi
AU  - Abhishek Pandey
PY  - 2026
DA  - 2026/11/03
PB  - arXiv
DO  - 10.48550/arxiv.2611.04984
UR  - https://arxiv.org/abs/2611.04984
AB  - The structural, electronic, and physical properties of previously unexplored layered tetragonal compound SrMn_2Ge_2 are reported. The compound crystallizes in the ThCr_2Si_2-type structure with a crystallographic parameters c/a ratio of 2.535(3), significantly smaller than those of the related BaMn_2Pn_2 compounds (Pn = 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.
ER  -