A Raman spectroscopy study on high quality single crystals of SrCr₂ As₂ (SCA) in the temperature T range 4K < T < 300K and high applied magnetic fields up to H = 9T is presented. The chromium B _1g phonon analysis reveals two anomalous shifts in the frequency, the first below T = 250K at H = 0T in the saturated AFM G-type order likely due to an enhanced electron–phonon coupling by the magnetic order, whereas the second anomaly occurs above H = 4T at T = 4K likely as a consequence of a magnetostructural displacive transition. Renormalization of the electronic Raman spectra in both studies reveals a decrease in the electronic density of states with decreasing T and increasing H, respectively, with consequent changes in the Fermi surface, which are intrinsically related to the observed anomalies.

介绍了在温度T范围 4K < T < 300K 和高达H = 9T 的高磁场下对 SrCr ₂ A s ₂ (SCA) 的高质量单晶的拉曼光谱研究。铬B _1g声子分析揭示了频率的两个异常变化，第一个低于T = 250K 在H = 0T 处于饱和 AFM G型阶可能是由于磁阶增强的电子 - 声子耦合，而第二个异常发生在H = 4T以上T = 4K 可能是磁结构位移转变的结果。两项研究中电子拉曼光谱的重整化表明，电子态密度分别随着T的降低和H的增加而降低，从而导致费米表面发生变化，这与观察到的异常本质上相关。