期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.137201
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资金
- NSF [DMR 0654118]
- State of Florida
- National Natural Science Foundation of China, the National Basic Research Program of China [2009CB929502, 2011CBA00111]
- Fundamental Research Funds for the Central Universities [WK2340000035]
By means of ac magnetic-susceptibility measurements, we find evidence for a new magnetic phase of Tb2Ti2O7 below about 140 mK in zero magnetic field. In magnetic fields parallel to [ 111], this phase is characterized by frequency-and amplitude-dependent susceptibility and extremely slow spin dynamics. In the zero-temperature limit, it extends to about 67 mT (the internal field H-int similar or equal to 52 mT), at which it makes transition to another phase. The field dependence of the susceptibility of this second phase, which extends to about 0.60 T (H-int similar or equal to 0.54 T) in the zero-temperature limit, indicates the presence of a weak magnetization plateau below about 50 mK, as has been predicted by a single-tetrahedron four-spin model, suggesting that the second phase is a quantum kagome ice. DOI: 10.1103/PhysRevLett.110.137201
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