Magnetic field induced antiferromagnetic tricritical points in Ce$_2 $Sb and Ce$_2 $Bi

F. Wu; C. Y. Guo; Y. Chen; H. Su; A. Wang; M. Smidman; H. Q. Yuan

doi:10.1103/PhysRevB.99.064419

Magnetic field induced antiferromagnetic tricritical points in Ce$_2 $Sb and Ce$_2 $Bi

Strongly Correlated Electrons 2019-02-21 v1

Authors: F. Wu , C. Y. Guo , Y. Chen , H. Su , A. Wang , M. Smidman , H. Q. Yuan

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Abstract

We present a detailed investigation of the physical properties of Ce $_2$ Sb and Ce $_2$ Bi single crystals, which undergo antiferromagnetic transitions at around 8.2 and 10 K respectively. When magnetic fields are applied parallel to the $c$ axis, metamagnetic transitions are observed at low temperatures, corresponding to a magnetic field-induced phase transition. It is found that the field-induced transition changes from second-order at higher temperatures, to first-order at low temperatures, suggesting the existence of tricritical points (TCPs) in both compounds. Since replacing Bi with Sb suppresses the TCP to lower temperatures and corresponds to a positive chemical pressure, these results suggest that applying pressure to Ce $_2$ Sb may suppress the TCP to lower temperatures, potentially to zero temperature at a quantum tricritical point.

Keywords

ce2sb ce2bi antiferromagnetic transitions metamagnetic transitions tricritical points chemical pressure quantum tricritical point

Cite

@article{arxiv.1902.07552,
  title  = {Magnetic field induced antiferromagnetic tricritical points in Ce$_2 $Sb and Ce$_2 $Bi},
  author = {F. Wu and C. Y. Guo and Y. Chen and H. Su and A. Wang and M. Smidman and H. Q. Yuan},
  journal= {arXiv preprint arXiv:1902.07552},
  year   = {2019}
}

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8 pages, 9 figures

Magnetic field induced antiferromagnetic tricritical points in Ce$_2 $Sb and Ce$_2 $Bi

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