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首页> 外文期刊>Physical review >Transition from Bose glass to a condensate of triplons in Tl_(1-x)K_xCuCl_3
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Transition from Bose glass to a condensate of triplons in Tl_(1-x)K_xCuCl_3

机译:从Bose玻璃过渡到Tl_(1-x)K_xCuCl_3中的三重冷凝物

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We report the magnetic-field-induced Bose glass-Bose-Einstein condensate (BEC) transition of triplons in Tl_(1-x)K_xCuCl_3 and its critical behavior, which were investigated through specific heat and electron spin resonance (ESR) measurements. The field dependence of the BEC transition temperature T_N can be described by the power law [H - H_c] ∝ T_n~φ near the quantum critical point H_c ~ 3 T. The critical exponent φ tends to reach a value smaller than 1/2 with decreasing fitting window in contrast to φ→ 3/2 for the standard BEC in a pure system. At sufficiently low temperatures, the ESR line shape for H ≌ H_c is intermediate between Gaussian and Lorentzian functions. This implies the localization of triplons for H < H_c at T = 0.
机译:我们报告了磁场在Tl_(1-x)K_xCuCl_3中发生的三重态的玻色玻璃-玻色-爱因斯坦冷凝物(BEC)跃迁及其临界行为,这是通过比热和电子自旋共振(ESR)测量进行研究的。 BEC转变温度T_N的场相关性可以由量子临界点H_c〜3 T附近的幂律[H-H_c] ∝ T_n〜φ来描述。临界指数φ趋于小于1/2与纯系统中标准BEC的φ→3/2相反,减小了拟合窗口。在足够低的温度下,H≌H_c的ESR线形介于高斯函数和洛伦兹函数之间。这意味着在T = 0时H

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