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Phonon Energy Gaps in the Charged Incommensurate Planes of the Spin-Ladder Sr14Cu24O41 Compound by Raman and Infrared Spectroscopy

Published inPhysical review letters, vol. 108, no. 21, 217401
Publication date2012-05-21
First online date2012-05-21

The terahertz (THz) excitations in the quantum spin-ladder system Sr14Cu24O41 have been determined along the c axis using THz time-domain, Raman, and infrared spectroscopy. Low-frequency infrared and Raman active modes are observed above and below the charge-ordering temperature T(co) is approximately equal to 200 K over a narrow interval approximately equal to 1-2 meV approximately equal to 8-16 cm(-1)). A new infrared mode at approximately equal to 1 meV develops below approximately equal to 100 K. The temperature dependence of these modes shows that they are coupled to the charge- and spin-density-wave correlations in this system. These low-energy features are conjectured to originate in the gapped sliding motion of the chain and ladder subsystems, which are both incommensurate and charged.

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THORSMØLLE, V. K. et al. Phonon Energy Gaps in the Charged Incommensurate Planes of the Spin-Ladder Sr<sub>14</sub>Cu<sub>24</sub>O<sub>41</sub> Compound by Raman and Infrared Spectroscopy. In: Physical review letters, 2012, vol. 108, n° 21, p. 217401. doi: 10.1103/PhysRevLett.108.217401
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ISSN of the journal0031-9007

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