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首页> 外文期刊>Physical review >Two types of alternating spin-1/2 chains and their field-induced transitions in ε-LiVOPO_4
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Two types of alternating spin-1/2 chains and their field-induced transitions in ε-LiVOPO_4

机译：两种类型的交替旋转-1 / 2链及其在ε-livopo_4中的现场引起的过渡

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摘要

Thermodynamic properties, ~(31)p nuclear magnetic resonance (NMR) measurements, and density-functional band-structure calculations for ε-LiVOPO_4 are reported. This quantum magnet features a singlet ground state and comprises two types of alternating spin-1/2 chains that manifest themselves by the double maxima in the susceptibility and magnetic specific heat, and by the two-step magnetization process with an intermediate 1/2-plateau. From thermodynamic data and band-structure calculations, we estimate the leading couplings of J_1 approx= 20 K and J_2 approx= 60 K and the alternation ratios of α_1 = J_1~'/J_1 approx= 0.6 and α_2 = J_2~'/J_2 approx= 0.3 within the two chains, respectively. The zero-field spin gap Δ_0/k_B approx= 7.3 K probed by thermodynamic and NMR measurements is caused by the J_1-./J_1~' spin chains and can be closed in the applied field of μ_0H_(c1) approx= 5.6 T. giving rise to a field-induced long-range order. The NMR data reveal predominant three-dimensional spin-spin correlations at low temperatures. Field-induced magnetic ordering transition observed above H_(c1) is attributed to the Bose-Einstein condensation of triplons in the sublattice formed by the J_1 -J_1~' chains with weaker exchange couplings.
机译：报道了热力学性质，〜（31）核磁共振（NMR）测量和ε-livopo_4的密度功能带结构计算。该量子磁体具有单向接地状态，并且包括两种类型的交替旋转-1 / 2链，其通过磁敏感和磁性热量的双重最大值显示出来，并且通过两步磁化过程具有中间1/2-高原。从热力学数据和带结构计算，我们估计J_1约= 20k和J_2大约= 60k的前导耦合以及α_1= j_1'/ j_1的交替比率约为0.6和α_2= j_2〜'/ j_2分别在两个链内= 0.3。通过热力学和NMR测量探测的零场自旋间隙Δ_0/ k_b约= 7.3k是由J_1-./j_1〜'旋转链引起的，并且可以在μ_0h_（c1）的施加的字段中关闭约= 5.6 t。产生现场诱导的远程订单。 NMR数据在低温下揭示主要的三维旋转旋转相关性。在H_（C1）上方观察到的场诱导的磁化转变归因于由J_1 -J_1〜'链中的子晶胞中的三轴的BOSE-Einstein冷凝，其具有较弱的交换联轴器。

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  • 来源
    《Physical review》 |2020年第22期|224403.1-224403.14|共14页
  • 作者

    Prashanta K. Mukharjee; K. M. Ranjith; M. Baenitz; Y. Skourski; A. A. Tsirlin; R. Nath;

  • 作者单位

    School of Physics Indian Institute of Science Education and Research Thiruvananthapuram-695551 India;

    Max Planck Institute for Chemical Physics of Solids Noethnitzer Str. 40 01187 Dresden Germany;

    Max Planck Institute for Chemical Physics of Solids Noethnitzer Str. 40 01187 Dresden Germany;

    Dresden High Magnetic Field Laboratory (HLD-EMFL) Helmholtz-Zentrum Dresden-Rossendorf 01314 Dresden Germany;

    Experimental Physics Ⅵ Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg 86135 Augsburg Germany;

    School of Physics Indian Institute of Science Education and Research Thiruvananthapuram-695551 India;

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