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Magnetic‐Field‐Controlled Quantum Critical Points in the Triangular Antiferromagnetic Cs2CuCl4‐xBrx Mixed System
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-06-09 , DOI: 10.1002/andp.202000147
Natalija Well 1, 2, 3 , Sitaram Ramakrishnan 2 , Ketty Beauvois 4 , Navid Qureshi 4 , Eric Ressouche 5 , Markos Skoulatos 6, 7 , Robert Georgii 6, 7 , Oksana Zaharko 3 , Sander Smaalen 2
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The triangular antiferromagnetic Cs2CuCl4‐xBrx mixed system is studied by neutron single‐crystal diffraction in magnetic field. It shows a rich magnetic phase diagram consisting of four regimes depending on the Br concentration and is characterized by different exchange coupling mechanisms. For the investigated compositions from regime I (0 < x ≤ 1.5), a critical magnetic field Bc is found for a Br concentration x = 0.8 at Bc = 8.10(1) T and for x = 1.1 at Bc = 7.73(1) T and from regime IV (3.2 < x < 4) for x = 3.3 at Bc = 0.99(3) T. For magnetic fields larger than the respective Bc, magnetic superlattice reflections of these compounds are not found. The incommensurate magnetic wave vector q = (0, 0.470, 0) appears below the ordering temperature TN = 0.51(1) K for Cs2CuCl3.2Br0.8, and q = (0, 0.418, 0) below TN = 1.00(6) K for Cs2CuCl0.3Br3.7. Neutron diffraction experiments at around 60 mK for x = 3.7 in a magnetic field show the critical magnetic field at Bc = 7.94(16) T and the formation of the second magnetic phase at around 8.5 T depending on the temperature. Inelastic neutron scattering experiments for the compound from regime III (2 < x ≤ 3.2) with x = 2.2 show dynamical correlations at a temperature around 50 mK giving evidence for a spin liquid phase.

中文翻译:

三角反铁磁Cs2CuCl4-xBrx混合系统中的磁场控制量子临界点

通过磁场中的中子单晶衍射研究了三角形反铁磁Cs 2 CuCl 4- x Br x混合体系。它显示了一个丰富的磁相图,该图由取决于Br浓度的四个区域组成,并且具有不同的交换耦合机制。对于从制度我所研究组合物(0 < X ≤1.5),临界磁场Ç被发现为溴浓度X = 0.8在Ç = 8.10(1)T和X = 1.1的Ç = 7.73( 1)T和从方案IV(3.2 < x <4)得出 xB c = 0.99(3)T时= 3.3 。对于大于各自B c的磁场,未发现这些化合物的磁性超晶格反射。对于Cs 2 CuCl 3.2 Br 0.8,不规则的磁波矢量q =(0,0.470,0)出现在订购温度T N = 0.51(1)K以下,而T N = 1.00以下的q =(0,0.418,0)(6)K为铯2的CuCl 0.33.7x在60 mK左右的中子衍射实验磁场中的3.7 =表示在B c  = 7.94(16)T处的临界磁场,并根据温度在8.5 T处形成第二磁性相。非弹性中子散射实验用于从政权III化合物(2 < X ≤3.2)与X = 2.2节目动力学相关性在约50 mK的温度为给自旋液相证据。
更新日期:2020-06-09
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