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首页> 外文期刊>Physical review >Heat capacity evidence for proximity to the Kitaev quantum spin liquid in A_2 IrO_3 (A = Na, Li)
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Heat capacity evidence for proximity to the Kitaev quantum spin liquid in A_2 IrO_3 (A = Na, Li)

机译：在A_2 IrO_3（A = Na，Li）中接近Kitaev量子自旋液体的热容证据

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摘要

The honeycomb lattice iridates A_2IrO_3 (A = Na, Li) are candidates for realization of the Kitaev-Heisenberg model although their proximity to Kitaev's quantum spin liquid (QSL) is still debated. We report on heat capacity C and entropy S_(mag) for A_2IrO_3 (A = Na, Li) in the temperature range 0.075 ≤ T ≤ 155 K. We find a well-separated two-peak structure for the magnetic heat capacity Cmag for both materials and Smag for Na_2IrO_3 shows a shoulder between the peaks with a value close to 1/2Rln2. These features signal the fractionalization of spins into Majorana fermions close to Kitaev's QSL [J. Nasu, M. Udagawa, and Y. Motome, Phys. Rev. B 92, 115122 (2015); Y. Yamaji, T. Suzuki, T. Yamada, S. I. Suga, N. Kawashima, and M. Imada, ibid. 93, 174425 (2016)]. These results provide the first thermodynamic evidence that A_2IrO_3 are situated close to the Kitaev QSL. Additionally we measure the high-temperature T ≤ 1000-K magnetic susceptibility x and estimate the Weiss temperature θ in the true paramagnetic state. We find θ ≈ -127 and -105 K， for Na_2IrO_3 and Li_2IrO_3， respectively suggesting that magnetic energy scales for the two materials could be very similar.
机译：蜂窝晶格铱酸盐A_2IrO_3（A = Na，Li）是实现Kitaev-Heisenberg模型的候选者，尽管它们与Kitaev的量子自旋液体（QSL）的接近程度尚有争议。我们报告了在0.075≤T≤155 K的温度范围内A_2IrO_3（A = Na，Li）的热容C和熵S_（mag）。我们发现了一个很好分离的两峰结构，两者的磁热容Cmag Na_2IrO_3的材料和Smag显示峰之间的肩峰，其值接近1 / 2Rln2。这些特征标志着自旋分裂成马塔拉纳费米子的过程接近于Kitaev的QSL [J． Nasu，M。Udagawa和Y. Momeme，物理学。 B 92，115122（2015）; Y. Yamaji，T。Suzuki，T。Yamada，S。I. Suga，N。Kawashima和M. Imada（同上）。 93，174425（2016）]。这些结果提供了第一个热力学证据，表明A_2IrO_3位于Kitaev QSL附近。另外，我们测量了高温T≤1000-K的磁化率x，并估计了真实顺磁态下的魏斯温度θ。对于Na_2IrO_3和Li_2IrO_3，我们发现θ≈-127和-105 K，分别表明这两种材料的磁能标度可能非常相似。

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  • 来源
    《Physical review》 |2017年第14期|144406.1-144406.5|共5页
  • 作者

    Kavita Mehlawat; A. Thamizhavel; Yogesh Singh;

  • 作者单位

    Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, Mohali 140306, India;

    Department of Condensed Matter Physics and Material Sciences, Tata Institute of Fundamental Research, Mumbai 400005, India;

    Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, Mohali 140306, India;

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