Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of collective excitation mode in Pr$_{\text{0.7}}$Ca$_{\text{0.3}}$MnO$_{\text{3}}$ by using THz time-domain spectroscopy

Details Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of collective excitation mode in Pr$_{\text{0.7}}$Ca$_{\text{0.3}}$MnO$_{\text{3}}$ by using THz time-domain spectroscopy Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of collective excitation mode in Pr$_{\text{0.7}}$Ca$_{\text{0.3}}$MnO$_{\text{3}}$ by using THz time-domain spectroscopy

2001-06-07

arxiv.org/abs/cond-mat/0106129v3

Phys. Rev. B 66, 024401-1-8 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

REVTeX4, 8 pages including 7 figures and 2 tables

Scientific paper

10.1103/PhysRevB.66.024401

THz time-domain spectroscopy was used to directly probe the low-energy (0.5--5 meV) electrodynamics of the charge-ordered manganite Pr$_{0.7}$Ca$_{0.3}$MnO$_3$. We revealed the existence of a finite peak structure around 2--3 meV well below the charge gap $\sim300$ meV. In analogy to the low-energy optical properties of the well-studied low-dimensional materials, we attributed this observed structure to the collective excitation mode arising from the charge-density-wave condensate. This finding provides the importance role of the quasi-one dimensional nature of the charge and orbital ordering in Pr$_{0.7}$Ca$_{0.3}$MnO$_3$.

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