Gradual evolution in spin dynamics of TlCu1-xMgxCl3 probed by muon-spin- relaxation (muSR) technique
Gradual evolution in spin dynamics of TlCu1-xMgxCl3 probed by muon-spin- relaxation (muSR) technique
复制标题
通过μ子自旋弛豫（muSR）技术探测TlCu1-xMgxCl3自旋动力学的逐渐演化
DOI：
10.1088/1742-6596/502/1/012041
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and Hidekazu Tanaka
中科院分区：
文献类型：
--
作者：
Takao Suzuki; Isao Watanabe;Fumiko Yamada;Yasuyuki Ishii;Kazuki Ohishi;Takayuki Goto;and Hidekazu Tanaka
在引入键随机的量子自旋系统Tl1−xkxcucl3 （x= 0.40）中进行了纵向场μ子自旋弛豫（LF-μSR）测量，观察到激发态三重态的玻色玻璃（BG）相与玻色-爱因斯坦凝聚（BEC）相相邻。在500 G以下的零场极限下，LF-μSR时间谱呈现指数型衰减，且μ子自旋弛豫速率在25 mK以下没有明显的温度依赖性，说明自旋在时间和空间上存在波动，表明自旋系统没有进入自旋间隙态。在这种情况下，理论预测的与BG相相邻的莫特绝缘相的间隙消失了。微探针LF-μSR测量结果与宏观磁化测量结果一致。
Longitudinal-field muon spin-relaxation (LF-μSR) measurements have been performed in a bond-randomness introduced quantum spin system, Tl1−xKxCuCl3withx= 0.40, in which the appearance of a Bose glass (BG) phase adjacent to the Bose–Einstein condensation (BEC) phase of excited triplets is observed. In the zero-field limit below 500 G, LF-μSR time spectra shows an exponential-like decay, and the muon spin-relaxation rate does not have a significant temperature dependence down to 25 mK. This indicates that spins fluctuate in time and in space, and that the spin system is not into a spin gapped state. It is suggested that the theoretically predicted gapped Mott insulating phase adjacent to the BG phase disappears in this case. This result obtained by microprobe LF-μSR measurements is consistent with an indication deduced from the results of macroscopic magnetization measurements.