Survival of magnetic correlations above the ordering temperature in the ferromagnetically ordered classical kagome magnet Li 9 Cr 3 ( P 2 O 7 ) 3 ( PO 4 ) 2
Survival of magnetic correlations above the ordering temperature in the ferromagnetically ordered classical kagome magnet Li 9 Cr 3 ( P 2 O 7 ) 3 ( PO 4 ) 2
复制标题
铁磁有序经典 Kagome 磁体 Li 9 Cr 3 ( P 2 O 7 ) 3 ( PO 4 ) 2 中磁关联在有序温度以上的存在
DOI：
10.1103/physrevb.107.134432
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发表时间：
2024
影响因子：
3.7
通讯作者：
and Y. Ihara
中科院分区：
文献类型：
--
作者：
R. Kumar;A. Chakraborty;S. Fukuoka;F. Damay;E. Kermarrec;P. L. Paulose;and Y. Ihara
由于最近在Heisenberg kagomé反铁磁体（LFPO）中发现了半经典自旋液体状态，[Kermarrec.物理学评论快报127，157202（2021）0031-900710.1103/PhysRevLett.127.157202]的基础上，我们通过研究具有激活轨道的同构kagomé磁体（LCPO），研究了自旋量子数对基态性质的影响.热力学测量表明，LCPO的基态性质主要由铁磁相互作用决定，其平均场温度和有序化温度均为2.7 K，有序化磁矩B的大小比完全有序磁矩的大小显著减小.从头算电子结构计算很好地证实了热力学结果，并建议存在额外的面内和面外的进一步邻居反铁磁耦合，虽然显着较弱的相比，占主导地位的第一近邻铁磁耦合。用大于饱和场的磁场测量自旋-晶格弛豫速率，在激发谱中显示出磁场诱导的间隙B），在极限差距有一个有限的截距φ 3 K，相当于平均场尺度.我们解释这个差距的起源是与材料固有的磁相互作用。利用我们的实验结果，我们建立了LCPO中类铁磁基态的稳定性和磁关联在有序温度以上的持久性。
Motivated by the recent discovery of a semiclassical nematic spin liquid state in a Heisenberg kagomé antiferromagnet(LFPO) with[Kermarrec. Phys. Rev. Lett. 127, 157202 (2021)0031-900710.1103/PhysRevLett.127.157202], we now investigate the impact of spin quantum numberon the ground-state properties by studying the isostructural kagomé magnet(LCPO) with activeorbitals and. Thermodynamic measurements reveal that the ground-state properties of LCPO is dominated by the ferromagnetic interactions with a mean-field temperatureand the ordering temperature,∼2.7 K, and the size of the ordered moment ∼1.05±0.25µB is significantly reduced from that of a fully ordered moment. Theab initioelectronic structure calculations nicely corroborate the thermodynamic results and suggest the presence of additional in- and out-of-plane further-neighbor antiferromagnetic couplings, although significantly weaker in comparison to the dominant first-nearest-neighbor ferromagnetic coupling. The spin-lattice relaxation rate measured with fields larger than the saturation field shows a magnetic field induced gapB) in the excitation spectrum, and inlimit the gap has a finite intercept ∼3 K, equivalent to the mean-field scale. We interpret the origin of this gap is associated with the magnetic interactions inherent to the material. With our experimental results, we establish the stabilization of a ferromagnetic like ground state and the persistence of magnetic correlations above the ordering temperature in LCPO.