Spin density wave order and fluctuations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>Si</mml:mi></mml:mrow></mml:math>: A transport study

Abstract

We present a comprehensive transport investigation of the itinerant antiferromagnet ${\mathrm{Mn}}_{3}\mathrm{Si}$ which undergoes a spin density wave (SDW) order below ${T}_{N}\ensuremath{\sim}21.3\phantom{\rule{4pt}{0ex}}\mathrm{K}$. The electrical resistivity, the thermal conductivity, and the Hall, Seebeck, and Nernst effects exhibit pronounced anomalies at the SDW transition. At temperatures higher than ${T}_{N}$ our data provide strong evidence for a large fluctuation regime which extends up to $\ensuremath{\sim}200\phantom{\rule{4pt}{0ex}}\mathrm{K}$ in the resistivity, the Seebeck effect, and the Nernst effect. From the comparison of our results with other prototype SDW materials, viz., LaFeAsO and chromium, we conclude that many of the observed features are of generic character.