Noriaki Kida

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

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 meVwell below the charge gap ∼300 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 .

Low-energy charge dynamics inLa0.7Ca0.3MnO3:THz time-domain spectroscopic studies

Direct experimental estimations of the low-energy (

Terahertz radiation from magnetoresistive Pr0.7Ca0.3MnO3 thin films

1.5\sim10

Reversible and bistable terahertz radiation from magnetoresistive Pr0.7Ca0.3MnO3 thin films

meV) complex dielectric constants spectrum and its temperature variation have been investigated for La

Observation of a pseudogap at terahertz frequencies in the ferromagnetic metallic phase of La2−2xSr1+2xMn2O7 (x=0.3)

_{0.7}

Fabrication and magneto-transport properties of La2−2xSr1+2xMn2O7 (x=0.3) thin films

Ca

Effect of charge ordering and disordering on terahertz radiation characteristics of magnetoresistive Pr0.7Ca0.3MnO3 thin films

_{0.3}

Terahertz radiation from magnetoresistive Pr0.7Ca0.3MnO3 thin films under strong electric fields

MnO

Terahertz radiation characteristics of charge-ordered manganite Pr0.7Ca0.3MnO3 thin films excited by ultrafast optical pulses

_3

THz spectroscopic evidence for a charge-density-wave formation in a charge-ordered manganite Pr0.7Ca0.3MnO3

thin films using terahertz time-domain spectroscopy. At low temperatures, a clear Drude-term emerges. With increasing temperature, the scattering rate increases, while the plasma frequency decreases, derived both from a simple Drude model. Finally, a Drude-term submerges well below the insulator-metal transition temperature. On the basis of the present results, low-energy charge dynamics are discussed.