Charge order induced sharp Raman peak in Sr_14Cu_24O_41

Abstract

In the two-leg S=1/2 ladders of Sr_14Cu_24O_41 a modulation of the exchange coupling arises from the charge order within the other structural element, the CuO_2 chains. In general, breaking translational invariance by modulation causes gaps within the dispersion of elementary excitations. We show that the gap induced by the charge order can drastically change the magnetic Raman spectrum leading to the sharp peak observed in Sr_14Cu_24O_41. This sharp Raman line gives insight in the charge-order periodicity and hence in the distribution of carriers. The much broader spectrum of La_6Ca_8Cu_24O$_41 reflects the response of an undoped ladder in the absence of charge order.

arXiv comment4 pages, 3 figures included, minor changes accounted for

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Cited by in corpus (11)

• Spectral Properties of Magnetic Excitations in Cuprate Two-Leg Ladder Systems
• Suppression of the charge-density-wave state in Sr_14Cu_24O_41 by calcium doping
• High Order Perturbation Theory for Spectral Densities of Multi-Particle Excitations: S=1/2 Two-Leg Heisenberg Ladder
• Giant phonon anomalies in the pseudo-gap phase of TiOCl
• Rung-singlet phase of the S=1/2 two-leg spin-ladder with four-spin cyclic exchange
• Raman Response of Magnetic Excitations in Cuprate Ladders and Planes
• Vertex corrections in the dynamic structure factor in spin ladders
• Size effects in the Verwey transition of nanometer-thick micron-wide magnetite crystals
• $K$ -edge and $L_3$ -edge RIXS study of columnar and staggered quantum dimer phases of the square lattice Heisenberg model
• Raman resonance in spin S two-leg ladder systems
• Effects of Ca substitution on quasi-acoustic sliding modes in Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$