We report the a.c. susceptibility study of Dy_xTb_{2-x}Ti_2O_7 with x in [0, 2]. In addition to the single-ion effect at Ts (single-ion effect peak temperature) corresponding to the Dy3+ spins as that in spin ice Dy_2Ti_2O_7 and a possible spin freezing peak at Tf (Tf < 3 K), a new peak associated with Tb^{3+} is observed in $χ_{ac}(T)$ at nonzero magnetic field with a characteristic temperature T^* (Tf < T^* < Ts). T^* increases linearly with x in a wide composition range (0 < x < 1.5 at 5 kOe). Both application of a magnetic field and increasing doping with Dy3+ enhance T^*. The T^* peak is found to be thermally driven with an unusually large energy barrier as indicated from its frequency dependence. These effects are closely related to the crystal field levels, and the underlying mechanism remains to be understood.
Anisotropic susceptibility of the geometrically frustrated spin-chain compound Ca3Co2O6
Ca_3Co_2O_6是一个具有一系列迷人性质的体系,包括磁化平台和在低温下非常缓慢的动力学。这些属性是密切相关的几何挫折,这是由于一个特定的组合的功能:(i)链排列在一个三角形晶格;(ii)有一个大的单轴各向异性;(iii)链内和链间耦合分别是铁磁性和反铁磁性。因此,单轴各向异性的Ca 3Co 2 O 6的物理性质的分析是一个至关重要的问题。然而,事实证明,迄今为止还没有对这种磁各向异性进行精确的研究。直接记录在单晶体上的磁化率数据的基础上,本研究报告的定量信息的各向异性的Ca 3Co 2 O 6。
Emergent Spin Supersolids in Frustrated Quantum Materials
RIKEN Center for Emergent Matter Science (CEMS)(理化学研究所新兴物质科学中心);RIKEN Center for Computational Science (R-CCS)(理化学研究所计算科学中心);RIKEN Center for Quantum Computing (RQC)(理化学研究所量子计算中心);RIKEN Pioneering Research Institute (PRI)(理化学研究所先锋研究 institute);Advanced Science Research Center, Japan Atomic Energy Agency(日本原子能机构先进科学研究中心)
Signature of spin liquid state in a frustrated 3D antiferromagnet
Indian Institute of Technology Madras(印度马德拉斯理工学院);ISIS Facility, Rutherford Appleton Laboratory(卢瑟福阿普尔顿实验室ISIS设施);R. B. College (A Constituent Unit of Lalit Narayan Mithila University, Darbhanga)(R.B.学院(拉尔·纳亚南·米提拉大学达班加 constituent unit));University of Johannesburg(约翰内斯堡大学);Laboratoire Léon Brillouin, CEA, CNRS, Université Paris-Saclay(莱昂·布里渊实验室,法国原子能和替代能源委员会,法国国家科学研究中心,巴黎萨克雷大学)
Emergent Vortex Ordering in a Multiflavor Pyrochlore-Lattice Compound GeCo$_2$O$_4$
University of Science and Technology of China(中国科学技术大学);Comprehensive Research Organization for Science and Society (CROSS)(综合研究组织科学社会);Rutherford Appleton Laboratory(鲁瑟福阿普顿实验室);Peking University(北京大学);China Institute of Atomic Energy(中国原子能科学研究院)
Topological spin freezing in frustrated quantum materials
Indian Institute of Technology Madras(印度马德拉斯理工学院);Quantum Centre of Excellence for Diamond and Emergent Materials, Indian Institute of Technology Madras(印度马德拉斯理工学院钻石与新兴材料卓越量子中心)
Magnetic properties of the geometrically frustrated S=1/2 antiferromagnets, La2LiMoO6 and Ba2YMoO6, with the B-site ordered double perovskite structure: Evidence for a Collective Spin Singlet Ground State
描述和探测自旋液体等非常规磁态是凝聚态物理中反复出现的话题。虽然传统上的大部分努力都是针对几何受挫的反铁磁体,但最近的研究表明,具有竞争性反铁磁和铁磁相互作用的系统也是有前途的候选材料。我们发现,这种竞争导致的特殊温度的概念,类似于气体,在竞争相互作用的平衡,系统是准理想的。虽然诱导弱微扰相互作用,这些特殊的温度是令人惊讶的高,并构成了一个可访问的实验诊断的最终秩序或自旋液体的性质。良好表征的哈密顿量和扩展的低温磁化率测量的正则阻挫铁磁体Dy $_2$ Ti $_2$ O $_7$使我们能够制定一个唯象和微观理论的特殊温度的磁铁。这类新磁体的其他成员包括钾镁矾Cu $_3$ Zn(OH)$_6$ Cl $_2$和尖晶石GeCo $_2$ O $_4$。
Two-dimensional percolation transition in two atomic layers of Fe on W(110): Direct measurement of a static percolation critical exponent in a two-dimensional Ising system
Emergent hidden order in ice: frustration and glassiness from slow hydrogen dynamics
University of Tennessee(田纳西大学);Xavier University(泽维尔大学);Oak Ridge National Laboratory(橡树岭国家实验室);Purdue University(普渡大学);The Ohio State University(俄亥俄州立大学)