Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor Eu$_5$Sn$_2$As$_6$

R. P. Day; K. Yamakawa; L. Pritchard Cairns; J. Singleton; Monica Allen; Joel E. Moore; James G. Analytis

Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor Eu$_5$Sn$_2$As$_6$

Strongly Correlated Electrons 2024-07-09 v1

Authors: R. P. Day , K. Yamakawa , L. Pritchard Cairns , J. Singleton , Monica Allen , Joel E. Moore , James G. Analytis

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Abstract

We report on the thermodynamic and transport properties of the rare-earth Zintl compound Eu $_5$ Sn $_2$ As $_6$ , which orders as a canted antiferromagnetic magnetic semiconductor at 10.3~K. The system also displays a complex cascade of magnetic phases arising from geometric and magnetic exchange frustration, with high sensitivity to the application and direction of small magnetic fields. At low temperature, Eu $_5$ Sn $_2$ As $_6$ exhibits negative colossal magnetoresistance of up to a factor of $6\times10^3$ . This may be a lower bound as the conductivity appears to be shunted by an unknown conduction channel, causing the resistivity to saturate. Mechanisms for the low temperature saturation of resistivity are discussed.

Keywords

magnetoresistance antiferromagnetic semiconductor Eu$_5$Sn$_2$As$_6$ colossal magnetoresistance magnetic frustration

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@article{arxiv.2407.06185,
  title  = {Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor Eu$_5$Sn$_2$As$_6$},
  author = {R. P. Day and K. Yamakawa and L. Pritchard Cairns and J. Singleton and Monica Allen and Joel E. Moore and James G. Analytis},
  journal= {arXiv preprint arXiv:2407.06185},
  year   = {2024}
}

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11 pages, 5 figures in main text, 5 appendices

Magnetoresistance and Anisotropic Spin Dynamics in Antiferromagnetic Semiconductor Eu$_5$Sn$_2$As$_6$

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