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In the two-leg S=1/2 ladders of Sr_14Cu_24O_41 a modulation of the exchangecoupling arises from the charge order within the other structural element, theCuO_2 chains. In general, breaking translational invariance by modulationcauses gaps within the dispersion of elementary excitations. We show that thegap induced by the charge order can drastically change the magnetic Ramanspectrum leading to the sharp peak observed in Sr_14Cu_24O_41. This sharp Ramanline gives insight in the charge-order periodicity and hence in thedistribution of carriers. The much broader spectrum of La_6Ca_8Cu_24O$_41reflects the response of an undoped ladder in the absence of charge order.Comment: 4 pages, 3 figures included, minor changes accounted fo

physical review letters

Charge-Order-Induced Sharp Raman Peak in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi><mml:mi mathvariant="normal">r</mml:mi></mml:mrow><mml:mn>14</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mn>24</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>41</mml:mn></mml:msub></mml:math>

Charge-Order-Induced Sharp Raman Peak inSr14Cu24O41