Pashkevich YG, Blinkin VA, Gnezdilov VP, Tsapenko VV, Eremenko VV, Lemmens P, Fischer M, Grove M, Guntherodt G, Degiorgi L, Wachter P, Tranquada JM, Buttrey DJ
A. A. Galkin Donetsk Phystech NASU, 83114 Donetsk, Ukraine.
Phys Rev Lett. 2000 Apr 24;84(17):3919-22. doi: 10.1103/PhysRevLett.84.3919.
We report Raman light-scattering and optical conductivity measurements on a single crystal of La1.775Sr0.225NiO4 which exhibits incommensurate charge-stripe order. The extra phonon peaks induced by stripe order can be understood in terms of the energies of phonons that occur at the charge-order wave vector Q(c). A strong Fano antiresonance for a Ni-O bond-stretching mode provides clear evidence for finite dynamical conductivity within the charge stripes.
我们报道了对具有非公度电荷条纹序的La1.775Sr0.225NiO4单晶进行的拉曼光散射和光导率测量。由条纹序诱导的额外声子峰可以根据在电荷序波矢Q(c)处出现的声子能量来理解。镍-氧键拉伸模式的强法诺反共振为电荷条纹内有限的动态电导率提供了明确证据。
