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Condensed Matter > Strongly Correlated Electrons

arXiv:1609.08883 (cond-mat)
[Submitted on 28 Sep 2016 (v1), last revised 12 Apr 2017 (this version, v2)]

Title:Frustrated magnetism in the Heisenberg pyrochlore antiferromagnets $A$Yb$_2$$X$$_4$ ($A$ = Cd, Mg, $X$ = S, Se)

Authors:Tomoya Higo, Kensuke Iritani, Mario Halim, Wataru Higemoto, Takashi U. Ito, Kentaro Kuga, Kenta Kimura, Satoru Nakatsuji
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Abstract:Our polycrystalline sample study on the Yb-based chalcogenide spinels $A$Yb$_2$$X_4$ ($A =$ Cd, Mg, $X =$ S, Se) has revealed frustrated magnetism due to the antiferromagnetically coupled Heisenberg spin on the pyrochlore lattice. Our crystal electric field analysis indicates the Yb ground state has nearly Heisenberg spins with a strong quantum character of the ground doublet. All the materials exhibit an antiferromagnetic order at 1.4-1.8 K, much lower temperature than the antiferromagnetic exchange coupling scale of $\sim 10$ K. The magnetic specific heat $C_{\rm M}$ shows a $T^{3}$ dependence, indicating the gapless feature in the Yb-based chalcogenide spinels. The magnetic entropy change much smaller than $R$ ln 2 below the Néel temperature and the small local magnetic field estimated from the $\mu$SR measurements strongly suggest the significantly reduced size of the ordered moment in comparison with the bare moment size 1.33 $\mu_{\rm B}$/Yb supporting strong fluctuations in the commensurate and incommensurate ordered states in CdYb$_2$S$_4$ and MgYb$_2$S$_4$, respectively.
Comments: 7 pages, 6 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:1609.08883 [cond-mat.str-el]
  (or arXiv:1609.08883v2 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.1609.08883
Journal reference: Phys. Rev. B 95, 174443 (2017)
Related DOI: https://doi.org/10.1103/PhysRevB.95.174443

Submission history

From: Tomoya Higo [view email]
[v1] Wed, 28 Sep 2016 12:29:58 UTC (3,391 KB)
[v2] Wed, 12 Apr 2017 14:15:49 UTC (4,283 KB)
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