Experimental search for the chiral glass transition in a ceramicBi2Sr2CaCu2O8sample
Experimental search for the chiral glass transition in a ceramicBi2Sr2CaCu2O8sample
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陶瓷 Bi2Sr2CaCu2O8 样品中手性玻璃化转变的实验研究
DOI：
10.1103/physrevb.70.064501
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发表时间：
2004
影响因子：
3.7
通讯作者：
P. Svedlindh
中科院分区：
文献类型：
--
作者：
E. Papadopoulou;P. Nordblad;P. Svedlindh
The nonlinear susceptibility of a melt-cast ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8}$ sample, displaying both the paramagnetic Meissner effect and magnetic aging, has been studied experimentally. The presence of magnetic aging in this sample proves that the spontaneous orbital magnetic moments exhibit correlated and frustrated dynamics at low temperatures. The possible existence of a chiral-glass phase transition was investigated by extracting a quantity corresponding to the order parameter susceptibility of the glass phase. It is shown that the expected divergent behavior of this quantity is hampered by relaxation effects and that the sample is out-of-equilibrium already at temperatures slightly below the superconducting transition temperature $({T}_{c})$. Time dependent magnetization experiments indicate that the magnetic relaxation at temperatures close to but below ${T}_{c}$ is due to isolated orbital magnetic moments, not yet being part of the collective orbital moment state that develops at slightly lower temperatures.
The nonlinear susceptibility of a melt-cast ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8}$ sample, displaying both the paramagnetic Meissner effect and magnetic aging, has been studied experimentally. The presence of magnetic aging in this sample proves that the spontaneous orbital magnetic moments exhibit correlated and frustrated dynamics at low temperatures. The possible existence of a chiral-glass phase transition was investigated by extracting a quantity corresponding to the order parameter susceptibility of the glass phase. It is shown that the expected divergent behavior of this quantity is hampered by relaxation effects and that the sample is out-of-equilibrium already at temperatures slightly below the superconducting transition temperature $({T}_{c})$. Time dependent magnetization experiments indicate that the magnetic relaxation at temperatures close to but below ${T}_{c}$ is due to isolated orbital magnetic moments, not yet being part of the collective orbital moment state that develops at slightly lower temperatures.