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arXiv 1004.4157cond-mat.str-el
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Cr $_{1-x}$ V $_x$在量子临界点附近的费米面

Fermi Surface of Cr$_{1-x}$V$_x$ across the Quantum Critical Point

J. F. DiTusa, R. G. Goodrich, N. Harrison, E. S. Choi

摘要:

我们测量了在$x_c=0.035$量子临界点两侧样品的高场下Cr $_{1-x}$ V $_x$,$0 \le x \le 0.05$的de Haas-van Alphen振荡。对于所有的样品,我们观察到只有那些振荡与一个单一的小孔带磁击穿轨道的重建费米表面明显的$x<x_c$。对于$x>x_c$,在Cr中最主要的自旋密度波(SDW)来自费米表面片的振荡的不存在进一步证明了这些电荷载流子的强波动散射良好地进入顺磁区。我们发现,在任何$x$的单个观察到的频带中的载流子没有显着的质量增强。我们的$x=0.035$晶体在特定方向的磁场的dHvA信号的异常场依赖性被确定为由于磁击穿,我们推测结果从场诱导SDW过渡在高场。

英文摘要:

We have measured de Haas-van Alphen oscillations of Cr$_{1-x}$V$_x$, $0 \le x \le 0.05$, at high fields for samples on both sides of the quantum critical point at $x_c=0.035$. For all samples we observe only those oscillations associated with a single small hole band with magnetic breakdown orbits of the reconstructed Fermi surface evident for $x<x_c$. The absence of oscillations from Fermi surface sheets most responsible for the spin density wave (SDW) in Cr for $x>x_c$ is further evidence for strong fluctuation scattering of these charge carriers well into the paramagnetic regime. We find no significant mass enhancement of the carriers in the single observed band at any $x$. An anomalous field dependence of the dHvA signal for our $x=0.035$ crystal at particular orientations of the magnetic field is identified as due to magnetic breakdown that we speculate results from a field induced SDW transition at high fields.

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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