Critical behavior of a photodisordered spin system in doped manganite
Critical behavior of a photodisordered spin system in doped manganite
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DOI：
10.1103/physrevb.64.100401
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发表时间：
2001-09-01
影响因子：
3.7
通讯作者：
Kawai, T
中科院分区：
文献类型：
--
作者：
Liu, XJ;Moritomo, Y;Kawai, T
通过时间分辨泵浦探针方法研究了铁磁 La0.7Ca0.3MnO3 薄膜中自旋系统的动力学。在弱激发条件下，弛豫时间 tau 在从低温侧接近临界温度 T-C (=262 K) 时会显着增加，因为当 T 大于或等于 200 K 时，tau 与 \T/T-C - 1\(-1.39) 成正比。令人惊讶的是，即使在更宽的温度范围（低至类似于 10 K）的强激发后，相同的比例关系仍然成立。我们将根据光致生长来讨论这些行为。电荷排序波动。
Dynamics of the spin system has been investigated in a ferromagnetic La0.7Ca0.3MnO3 film by means of a time-resolved pump-probe method. In a weak excitation condition, the relaxation time tau increases critically on approaching the critical temperature T-C (=262 K) from the low-temperature side as tau proportional to \T/T-C - 1\(-1.39) for T greater than or similar to 200 K. Surprisingly, the same scaling relation holds even after strong excitation in a much wider temperature range down to similar to 10 K. We will discuss these behaviors in terms of photoinduced growth of the charge-ordering fluctuations.