Journal
PHYSICAL REVIEW B
Volume 66, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.66.024401
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THz time-domain spectroscopy was used to directly probe the low-energy (0.5-5 meV) electrodynamics of the charge-ordered manganite Pr0.7Ca0.3MnO3. We revealed the existence of a finite peak structure around 2-3 meV well below the charge gap similar to300 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 Pr0.7Ca0.3MnO3.
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