# Kondo-like mass enhancement of Dirac fermion in iron pnictides Ba(Fe$\_{1-x}$Mn$\_x$As)$\_2$

Source: [Kondo-like mass enhancement of Dirac fermion in iron pnictides Ba(Fe$\_{1-x}$Mn$\_x$As)$\_2$](<https://www.sota2.com/research/paper/68fa2cfe1e209131ce855420>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T15:42:19.847Z

Authors: T. Urata, Y. Tanabe, K. K. Huynh, H. Oguro, K. Watanabe, S. Heguri, K. Tanigaki

Published: 2013-07-10T14:51:31.000Z

## Abstract

The effect of Mn substitution, acting as a magnetic impurity for Fe, on the Dirac cone was investigated in Ba(Fe$\_{1-x}$Mn$\_x$As)$\_2$. Both magnetoresistance and Hall resistivity studies clearly indicate that the cyclotron effective mass ($m^{\\ast}$) of the Dirac cone is anomalously enhanced at low temperatures by the impurity, although its evolution as a function of carrier number proceeds in a conventional manner at higher temperatures. Kondo-like band renormalization induced by the magnetic impurity scattering is suggested as an explanation for this, and the anomalous mass enhancement of the Dirac fermions is discussed.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1307.2813>)

[PDF](<https://arxiv.org/pdf/1307.2813.pdf>)