Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region

We report on THz absorption spectroscopy combined with high magnetic fields of polycrystalline RCrO<sub>3</sub> (R = Pr, Sm, Er) aiming understanding spin wave resonances at their low temperature magnetic phases. Our measurements show that the temperature, and the implicit anisotropies a...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Massa, Néstor Emilio, Holldack, Karsten, Sopracase, R., Phuoc, Vinh Ta, del Campo, Leire, Echegut, Patrick, Alonso, José Antonio
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2018
Materias:
Ciencias Exactas
Física
THz spectroscopy
Spin wave resonances
Crystal field levels
Magneto optical effects
Multiferroics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124335
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124335
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
THz spectroscopy
Spin wave resonances
Crystal field levels
Magneto optical effects
Multiferroics
spellingShingle Ciencias Exactas
Física
THz spectroscopy
Spin wave resonances
Crystal field levels
Magneto optical effects
Multiferroics
Massa, Néstor Emilio
Holldack, Karsten
Sopracase, R.
Phuoc, Vinh Ta
del Campo, Leire
Echegut, Patrick
Alonso, José Antonio
Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region
topic_facet Ciencias Exactas
Física
THz spectroscopy
Spin wave resonances
Crystal field levels
Magneto optical effects
Multiferroics
description We report on THz absorption spectroscopy combined with high magnetic fields of polycrystalline RCrO<sub>3</sub> (R = Pr, Sm, Er) aiming understanding spin wave resonances at their low temperature magnetic phases. Our measurements show that the temperature, and the implicit anisotropies at which the Cr<sup>3+</sup> spin reorientation at TSR takes place, are determinant on the ferromagnetic-like (FM) and the antiferromagnetic-like (AFM) spin modes being optically active. It is found that they are dependent on Rare Earth 4f moment and ion size. We also studied temperature and field dependence of crystal field levels in the same spectroscopic region. Pr<sup>3+</sup> non-Kramers emerges at 100 K and Zeeman splits. An observed absence of spin wave resonances in PrCrO<sub>3</sub> is attributed to Pr<sup>3+</sup> remaining paramagnetic. In SmCrO<sub>3</sub> near cancelation of the spin and orbital moments is proposed as the possible reason for not detecting Sm<sup>3+</sup> ground state transitions. Here, the FM and AFM resonant modes harden when the temperature decreases and split linearly under applied fields at 5 K and below. In ErCrO<sub>3</sub> the Er<sup>3+</sup> Kramers doublet becomes active at about the TSR onset. Each line further experiences Zeeman splitting under magnetic fields while an spin reversal induced by a ∼2.5 T field, back to the Γ4 (Fz) from the Γ1 phase at 2 K, produces a secondary splitting. The 5 K AFM and FM excitations in ErCrO<sub>3</sub> have a concerted frequency-intensity temperature dependence and a shoulder pointing to the Er<sup>3+</sup> smaller ion size also disrupting the two magnetic sublattice approximation. Both resonances reduce to one when the temperature is lowered to 2 K in the Γ1 representation. Our findings have important implications on the complex interplay in the magneto-electrodynamics associated with the Rare-Earth 4f – 3d transition metal spin coupling and the structural A site instabilities in perovskite multiferroics.
format Articulo
Preprint
author Massa, Néstor Emilio
Holldack, Karsten
Sopracase, R.
Phuoc, Vinh Ta
del Campo, Leire
Echegut, Patrick
Alonso, José Antonio
author_facet Massa, Néstor Emilio
Holldack, Karsten
Sopracase, R.
Phuoc, Vinh Ta
del Campo, Leire
Echegut, Patrick
Alonso, José Antonio
author_sort Massa, Néstor Emilio
title Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region
title_short Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region
title_full Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region
title_fullStr Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region
title_full_unstemmed Identification of spin wave resonances and crystal field levels in simple chromites RCrO<sub>3</sub> (R = Pr, Sm, Er) at low temperatures in the THz spectral region
title_sort identification of spin wave resonances and crystal field levels in simple chromites rcro<sub>3</sub> (r = pr, sm, er) at low temperatures in the thz spectral region
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/124335
work_keys_str_mv AT massanestoremilio identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
AT holldackkarsten identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
AT sopracaser identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
AT phuocvinhta identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
AT delcampoleire identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
AT echegutpatrick identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
AT alonsojoseantonio identificationofspinwaveresonancesandcrystalfieldlevelsinsimplechromitesrcrosub3subrprsmeratlowtemperaturesinthethzspectralregion
bdutipo_str Repositorios
_version_ 1764820450149400578

Ejemplares similares