Complex antiferromagnetic order in the garnet Co3Al2Si3O12

Article

关键词: MAGNETIC-PROPERTIES;    DIFFRACTION;   

DOI  :  10.1103/PhysRevB.101.144424

来源: SCIE

【 摘 要 】

We studied the magnetic properties of the garnet Co(3A)l(2)Si(3)O(12) synthesized under 5.5 GPa and 1250 degrees C by means of dc magnetic susceptibility, neutron powder diffraction, and specific heat. Although the magnetic Co2+ ions form a geometrically frustrated hyper-Kagome lattice, we find that Co3Al2Si3O12 exhibits a long-range antiferromagnetic order below T-N = 11K without showing magnetic frustration, i.e., the frustration index f = vertical bar theta(CW)/T-N vertical bar is close to unity. Refinements from neutron-diffraction data show that Co3Al2Si3O12 forms a complex antiferromagnetic structure characterized by the coexistence of collinear and commensurate spiral magnetic ordering of Co2+ sublattices. Magnetic field induced spin-flop transition at mu H-0(c) approximate to 4T was also observed below TN.

【 授权许可】

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