The Haldane State in CsNiCl 3 Detected by Magnetization Measurements -- Observation of Quantum-Classical Crossover and the Valence Bond Solid State --
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN(2013)
摘要
We have confirmed from susceptibility and magnetization measurements that the Haldane state really exists in 1D phase of CsNiCl3 which undergoes 3D ordering at T-N = 4.8 K. The observed susceptibility at low fields follows the predicted curve for the S = 1 quantum chain with energy gap (Delta/k(B) similar to 10 K) down to near T-N. A more definite evidence for the Haldane state is given by studying the effect of the nonmagnetic impurities, We haw revealed a real existence of S = 1/2 edge states characteristic of the Haldane state and further revealed a crossover from the quantum to classical regimes as a function of both temperature and field, The result is consistent with the model that at low temperatures (T < T-G Delta/k(B)) and low fields (H < H-G Delta/g mu(B)) the Haldane state is well defined to form the Valence-Bond-Solid while at high temperatures (T > \J\/k(B)) and high fields (H > H-G) the system is not in the Haldane state any more.
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关键词
Haldane state,CsNiCl3,impurity effect,magnetization,susceptibility,quantum-classical crossover,VBS
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