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Condensed Matter > Strongly Correlated Electrons

arXiv:1512.07792 (cond-mat)
[Submitted on 24 Dec 2015]

Title:Spin frustration and magnetic ordering in triangular lattice antiferromagnet Ca$_3$CoNb$_2$O$_9$

Authors:J. Dai, P. Zhou, P. S. Wang, F. Pang, T J. Munsie, G. M. Luke, J. S. Zhang, Weiqiang Yu
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Abstract:We synthesized a quasi-two-dimensional distorted triangular lattice antiferromagnet Ca$_3$CoNb$_2$O$_9$, in which the effective spin of Co$^{2+}$ is 1/2 at low temperatures, whose magnetic properties were studied by dc susceptibility and magnetization techniques. The x-ray diffraction confirms the quality of our powder samples. The large Weiss constant $\theta_{CW}\sim$ $-55$ K and the low Neel temperature($T_N\sim$ 1.45 K) give a frustration factor $f$ ($=\mid\theta_{CW}/T_N \mid$) $\approx$ 38, suggesting that Ca$_3$CoNb$_2$O$_9$ resides in strong frustration regime. Slightly below $T_N$, deviation between the susceptibility data under zero-field cooling (ZFC) and field cooling (FC) is observed. A new magnetic state with 1/3 of the saturate magnetization $M_s$ is suggested in the magnetization curve at 0.46 K. Our study indicates that Ca$_3$CoNb$_2$O$_9$ is an interesting material to investigate magnetism in triangular lattice antiferromagnets with weak anisotropy.
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:1512.07792 [cond-mat.str-el]
  (or arXiv:1512.07792v1 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.1512.07792
Journal reference: Chin.Phys.B 24, 127508(2015)
Related DOI: https://doi.org/10.1088/1674-1056/24/12/127508

Submission history

From: Jia Dai [view email]
[v1] Thu, 24 Dec 2015 11:28:31 UTC (511 KB)
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