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arXiv 1012.0515cond-mat.str-el
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Cr掺杂V $_2$ O $_3$的晶格软化效应

Lattice softening effects at the Mott critical point of Cr-doped V$_2$O$_3$

S. Populoh, P. Wzietek, R. Gohier, P. Metcalf

摘要:

我们在(V $_{1-x}$ Cr $_x$)$_2$ O $_3$中进行了一阶Mott转变线临界点附近的声速测量。在恒定温度下的压力扫描揭示了$c_{33}$压缩模量的大的下降,该下降随着接近临界点而尖锐。我们没有观察到的剪切模量$c_{44}$,这是一致的过渡由一个标量序参量,根据DMFT描述的过渡临界迹象。然而,效果的幅度是一个数量级小于从DMFT计算获得的一个单带哈伯德模型。我们分析我们的结果,使用一个简单的模型与电子响应函数从电导率的标度关系。

英文摘要:

We have performed sound velocity measurements in (V$_{1-x}$Cr$_x$)$_2$O$_3$ in the vicinity of the critical point of the first order Mott transition line. The pressure sweeps at constant temperature reveal a large dip in the $c_{33}$ compression modulus, this dip sharpens as the critical point is approached. We do not observe signs of criticality on the shear modulus $c_{44}$ which is consistent with a transition governed by a scalar order parameter, in accordance with the DMFT description of the transition. However, the amplitude of the effect is an order of magnitude smaller than the one obtained from DMFT calculations for a single band Hubbard model. We analyze our results using a simple model with the electronic response function obtained from the scaling relations for the conductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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