Recent PRL using TeraView's spectrometer

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


PRL 108, 217401 (2012)


V. K. Thorsmølle^1,2,4,*, C. C. Homes^3,†, A. Gozar^3,‡, G. Blumberg⁴, J. L. M. van Mechelen², A. B. Kuzmenko², S. Vanishri⁵, C. Marin⁵, and H. M. Rønnow<sup>6 

1</sup>Laboratory for Photonics and Interfaces, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Switzerland
²Département de Physique de la Matière Condensée, Université de Genève, CH-1211 Genève 4, Switzerland
³Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
⁴Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
⁵CEA Grenoble, INAC, SPSMS, IMAPEC, 17 rue des Martyrs, 38054 Grenoble, France
⁶Laboratory for Quantum Magnetism, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Switzerland

Abstract

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≃200  K over a narrow interval ≃1–2  meV (≃8–16  cm^-1). A new infrared mode at ≃1  meV develops below ≃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.


For full paper see http://prl.aps.org/abstract/PRL/v108/i21/e217401





............The THz-TDS experiments (TPI spectra 1000, TeraView Ltd.) were performed in transmission geometry with the sample mounted inside an optical cryostat capable of reaching 5 K. To obtain the complex conductivity and the transmittance window of the time-domain signals lasting beyond 60 ps (containing several Fabry-Perot internal sample reflections),............................










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