Details

Autor(en) / Beteiligte

• Kadyrov, L S
• Zhukova, E S
• Torgashev, V I
• Zhang, T
• Gagkaeva, Z V
• Dressel, M
• Gorshunov, B P

Titel

Terahertz spectroscopy of low-energy excitations in Eu0.42Sr0.58MnO3

Ist Teil von

• Physical review. B, 2017-12, Vol.96 (24)

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2017

Quelle

American Physical Society

Beschreibungen/Notizen

• The origin of low-energy excitations in the polycrystalline Eu0.42Sr0.58MnO3 manganite is explored by terahertz and infrared spectroscopies. The transition from the charge and/or orbital to antiferromagnetic order (TN=130−140K) is seen as smooth (spread over a temperature range from 50 to 100 K) decrease of free-carrier conductivity with the activation energy change from 86 meV (high temperatures) to 0.52 meV (low temperatures). A broad relaxation is observed at around 10cm−1 which we associate with the dynamics of free charge carriers in the presence of random localizing potential. We discover an absorption resonance at ≈50cm−1 below TN that is assigned to the formation of hybridized “acoustic phonon-magnon” quasiparticles.