Infrared reflectivity of Tl1.94Mn2O6.96

NESTOR E. MASSA; JOSE´ ANTONIO ALONSO; MARIA JESUS MARTINEZ-LOPE,; MARIA TERESA CASAIS; HORACIO SALVA

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Institute of Physics

Lugar: Mellville; Año: 1999 vol. 60 p. 7445 - 7451

0163-1829

We report temperature dependent infrared reflectivity of Tl1.94Mn2O6.96 in the 30 to 10 000 cm21 frequency range. We found that between room temperature and the Curie temperature (TC>TIM) in which the insulatorferromagnetic metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved range. We found that between room temperature and the Curie temperature (TC>TIM) in which the insulatorferromagnetic metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved 1.94Mn2O6.96 in the 30 to 10 000 cm21 frequency range. We found that between room temperature and the Curie temperature (TC>TIM) in which the insulatorferromagnetic metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved TC>TIM) in which the insulatorferromagnetic metal phase transition takes place, Tl1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved 1.94Mn2O6.96 behaves as an insulator with antiresonances near the longitudinal optical modes indicating distinctive electron-phonon interactions. Below TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved TC the band envelope assigned to breathing oxygen phonons undergoes broadening and frequency hardening and the sample becomes a poor metal oxide in which small trapped polaron electrons are released with decreasing temperature. We support this conclusion pointing to the agreement between the experimental and the calculated; using Reik’s small polaron theory, optical conductivity strongly suggests that conductivity be achieved