期刊
PHYSICAL REVIEW B
卷 93, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.134423
关键词
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资金
- Scientific User Facilities Division, Office of Science, Basic Energy Sciences, U.S. Department of Energy
- U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- Gordon and Betty Moore Foundations EPiQS Initiative [GBMF4416]
Single crystals of the Kitaev spin-liquid candidate alpha-RuCl3 have been studied to determine the low-temperature bulk properties, the structure, and the magnetic ground state. Refinements of x-ray diffraction data show that the low-temperature crystal structure is described by space group C2/m with a nearly perfect honeycomb lattice exhibiting less than 0.2% in-plane distortion. The as-grown single crystals exhibit only one sharp magnetic transition at T-N = 7K. The magnetic order belowthis temperature exhibits a propagation vector of k = (0,1,1/3), which coincides with a three-layer stacking of the C2/m unit cells. Magnetic transitions at higher temperatures up to 14 K can be introduced by deformations of the crystal that result in regions in the crystal with a two-layer stacking sequence. The best-fit symmetry-allowed magnetic structure of the as-grown crystals shows that the spins lie in the ac plane, with a zigzag configuration in each honeycomb layer. The three-layer repeat out-of-plane structure can be refined as a 120 degrees spiral order or a collinear structure with a spin direction of 35 degrees away from the a axis. The collinear spin configuration yields a slightly better fit and also is physically preferred. The average ordered moment in either structure is less than 0.45(5) mu(B) per Ru3+ ion.
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