对合子态结晶的实验观察
Experimental observation of the crystallization of a paired holon state
摘要：
利用紫外共振喇曼散射，在201 meV处观察到掺杂空穴梯形铜酸盐Sr $_{14}$ Cu $_{24}$ O $_{41}$的一个新的激发.的激发被发现是电荷的性质，与温度无关的激发能，并可以通过内的阶梯对断裂过程中理解。的强度密切跟踪阶梯（CDW $_L$）中的电荷密度波的顺序参数，但持续高于CDW $_L$转变温度（$T_{CDW_L}$），表明强的本地配对以上$T_{CDW_L}$。201 meV激发消失在La $_{6}$ Ca $_{8}$ Cu $_{24}$ O $_{41+δ}$和La $_{5}$ Ca $_{9}$ Cu $_{24}$ O $_{41}$中，它们是在梯中没有孔的样品。我们的研究结果表明，掺杂的空穴在梯子的复合玻色子组成的成对的holon，低于$T_{CDW}$。
英文摘要：
A new excitation is observed at 201 meV in the doped-hole ladder cuprate Sr$_{14}$Cu$_{24}$O$_{41}$, using ultraviolet resonance Raman scattering with incident light at 3.7 eV polarized along the direction of the rungs. The excitation is found to be of charge nature, with a temperature independent excitation energy, and can be understood via an intra-ladder pair-breaking process. The intensity tracks closely the order parameter of the charge density wave in the ladder (CDW$_L$), but persists above the CDW$_L$ transition temperature ($T_{CDW_L}$), indicating a strong local pairing above $T_{CDW_L}$. The 201 meV excitation vanishes in La$_{6}$Ca$_{8}$Cu$_{24}$O$_{41+δ}$, and La$_{5}$Ca$_{9}$Cu$_{24}$O$_{41}$ which are samples with no holes in the ladders. Our results suggest that the doped holes in the ladder are composite bosons consisting of paired holons that order below $T_{CDW}$.
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