CEQUINOR   05415
CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Far- and mid-infrared emission and reflection of magnetoelectric RMnO3 and RCrO3
Autor/es:
NESTOR E. MASSA; LEIRE DEL CAMPO; DOMINGOS DE SOUSA MENESES; PATRICK ECHEGUT; MARIA JESUS MARTINEZ-LOPE,; JOSE A. ALONSO
Lugar:
Baltimore, MD
Reunión:
Congreso; American Physical Society March Meeting; 2013
Institución organizadora:
American Physical Society
Resumen:
Abstract Submitted for the MAR13 Meeting of The American Physical Society Far- and mid-infrared emission and reection of magnetoelec- tric RMnO3 and RCrO3 (R=Rare Earth) NESTOR E. MASSA, LANAIS EFO-CEQUINOR, UNLP, La Plata, Argentina, LEIRE DEL CAMPO, DOMIN- GOS DE SOUSA MENESES, PATRICK ECHEGUT, CNRS-CEMHTI, Orleans, France, MARIA JESUS MARTINEZ-LOPE, JOSE ANTONIO ALONSO, ICMM- CSIC, Madrid, Spain | Far- and mid-infrared emission and reection spectra of fer- rielectric hexagonal TmMnO3 show that small polarons, a paramagnetic collective electronic mode, and lower than TN soft hybrid modes are in concomitant relation. CO2 laser heating in dry air triggers oxidation and Mn3+- Mn4+ double exchange hopping conductivity. A collective excitation in the paramagnetic phase is assigned to eg electrons in THz low energy d-orbital uctuations. It locks-in at the E-type antiferromagnetic onset (TN  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.3 and RCrO3 (R=Rare Earth) NESTOR E. MASSA, LANAIS EFO-CEQUINOR, UNLP, La Plata, Argentina, LEIRE DEL CAMPO, DOMIN- GOS DE SOUSA MENESES, PATRICK ECHEGUT, CNRS-CEMHTI, Orleans, France, MARIA JESUS MARTINEZ-LOPE, JOSE ANTONIO ALONSO, ICMM- CSIC, Madrid, Spain | Far- and mid-infrared emission and reection spectra of fer- rielectric hexagonal TmMnO3 show that small polarons, a paramagnetic collective electronic mode, and lower than TN soft hybrid modes are in concomitant relation. CO2 laser heating in dry air triggers oxidation and Mn3+- Mn4+ double exchange hopping conductivity. A collective excitation in the paramagnetic phase is assigned to eg electrons in THz low energy d-orbital uctuations. It locks-in at the E-type antiferromagnetic onset (TN  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.3 show that small polarons, a paramagnetic collective electronic mode, and lower than TN soft hybrid modes are in concomitant relation. CO2 laser heating in dry air triggers oxidation and Mn3+- Mn4+ double exchange hopping conductivity. A collective excitation in the paramagnetic phase is assigned to eg electrons in THz low energy d-orbital uctuations. It locks-in at the E-type antiferromagnetic onset (TN  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.N soft hybrid modes are in concomitant relation. CO2 laser heating in dry air triggers oxidation and Mn3+- Mn4+ double exchange hopping conductivity. A collective excitation in the paramagnetic phase is assigned to eg electrons in THz low energy d-orbital uctuations. It locks-in at the E-type antiferromagnetic onset (TN  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.2 laser heating in dry air triggers oxidation and Mn3+- Mn4+ double exchange hopping conductivity. A collective excitation in the paramagnetic phase is assigned to eg electrons in THz low energy d-orbital uctuations. It locks-in at the E-type antiferromagnetic onset (TN  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.g electrons in THz low energy d-orbital uctuations. It locks-in at the E-type antiferromagnetic onset (TN  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.N  80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.N as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.3 (Lewtas et al, Phys. Rev. B 82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.82, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.g in deformed d-orbitals. Sharing this behavior with orthorhombic NdMnO3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.3 there is no evidence of new phonons in a structural deformation down to 4K Preliminary results in ErCrO3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.3 (TN  130 K) show the emerging soft bands in an order-disorder scenario. Overall, we conclude that magnetoelastic deformations in an orbital uctuating environment are close related to magnetoelectric couplings.
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