论文标题
与随机交换的准二维量子量量子量质量和混乱
Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange
论文作者
论文摘要
我们介绍了$ s = 1/2 $ square lattice quasi-two-two量子量子量子Heisenberg AntiferRomagnet（Quinh）$ _ 2 $ _ 2 $ _ CU（Cl $ _ {x} $ _ br $ _ {1-x} $ 2 （quinh $ = $ quinolinium，c $ _9 $ h $ _8 $ n $^+$），$ 0 \ leq x \ leq 1 $。脉冲场磁化测量值使我们能够在一个体制中估算一个有效的平面交换强度$ j $，在该机制中，交换会促进短距离顺序，而温度$ t _ {\ mathrm {n}} $，在使用muon-spin helawice中发现了远距离顺序（LRO），从而使我们可以为我们构建一个相位图。我们评估疾病在抑制$ t _ {\ mathrm {n}} $的有效性和有序的力矩大小，并在该区域中找到一个扩展的无序相位$ 0.4 \ sillesim x \ lyssim x \ Lessim 0.8 $，在不发生磁性顺序的情况下，由交换随机性的量子效应驱动。
We present an investigation of the effect of randomizing exchange strengths in the $S=1/2$ square lattice quasi-two-dimensional quantum Heisenberg antiferromagnet (QuinH)$_2$Cu(Cl$_{x}$Br$_{1-x}$)$_{4}\cdot$2H$_2$O (QuinH$=$Quinolinium, C$_9$H$_8$N$^+$), with $0\leq x \leq 1$. Pulsed-field magnetization measurements allow us to estimate an effective in-plane exchange strength $J$ in a regime where exchange fosters short-range order, while the temperature $T_{\mathrm{N}}$ at which long range order (LRO) occurs is found using muon-spin relaxation, allowing us to construct a phase diagram for the series. We evaluate the effectiveness of disorder in suppressing $T_{\mathrm{N}}$ and the ordered moment size and find an extended disordered phase in the region $0.4 \lesssim x \lesssim 0.8$ where no magnetic order occurs, driven by quantum effects of the exchange randomness.
