Phonon Energy Gaps in the Charged Incommensurate Planes of the Spin-LadderSr14Cu24O41Compound by Raman and Infrared Spectroscopy
| Autor: | Henrik M. Rønnow, S. Vanishri, V. K. Thorsmolle, C. Marin, Girsh Blumberg, J. L. M. van Mechelen, Alexey B. Kuzmenko, Adrian Gozar, Christopher C. Homes |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Condensed matter physics Infrared Terahertz radiation Phonon energy General Physics and Astronomy Infrared spectroscopy Charge (physics) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake 0103 physical sciences symbols Atomic physics 010306 general physics 0210 nano-technology Raman spectroscopy Quantum Spin-½ |
| Zdroj: | Physical Review Letters. 108 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.108.217401 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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