Long-range order and spin-liquid states of polycrystalline Tb2+xTi2-xO7+y

Article

关键词: PYROCHLORE ANTIFERROMAGNET TB2TI2O7;    MAGNETS;   

DOI  :  10.1103/PhysRevB.87.060408

来源: SCIE

【 摘 要 】

Low-temperature states of polycrystalline samples of a frustrated pyrochlore oxide Tb2+x Ti2-x O7+y have been investigated by specific heat, magnetic susceptibility, and neutron scattering experiments. We have found that this system can be tuned by a minute change of x from a spin-liquid state (x < x(c)) to a partly ordered state with a small antiferromagnetic ordering of the order of 0.1 mu(B). Specific heat shows a sharp peak at a phase transition at T-c = 0.5 K for x = 0.005. Magnetic excitation spectra for this sample change from a quasielastic to a gapped type through T-c. The possibility of a Jahn-Teller transition is discussed. DOI: 10.1103/PhysRevB.87.060408

【 授权许可】

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