超声探测d_{x2-y2}波Pomeranchuk不稳定性
Probing the d_{x2-y2}-wave Pomeranchuk instability by ultrasound
摘要：
分析了超声衰减和声速重整化的选择规则，并考虑到它们在识别Pomeranchuk不稳定性（电子相变）中的潜在应用。结果表明，在d_{x2-y2}波Pomeranchuk不稳定性附近，Fermi面涨落增强了[110]方向的横向声衰减，而[100]方向的声衰减不受影响.此外，通过自洽重整化方案分析了不稳定性之上的涨落区域。结果可以直接应用到Sr3Ru2O7，这是一个潜在的候选人的Pomeranchuk不稳定性在其变磁转变在强磁场。
英文摘要：
Selection rules of ultrasound attenuation and sound velocity renormalization are analyzed in view of their potential application to identify Pomeranchuk instabilities (electronic nematic phase). It is shown that the transverse sound attenuation along [110] direction is enhanced by the Fermi surface fluctuations near a d_{x2-y2}-wave Pomeranchuk instability, while the attenuation along [100] direction remains unaffected. Moreover the fluctuation regime above the instability is analyzed by means of a self-consistent renormalization scheme. The results could be applied directly to Sr3Ru2O7 which is a potential candidate for a Pomeranchuk instability at its metamagnetic transition in strong magnetic fields.
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