Origin of the enhanced ferroelectricity in multiferroic SmM n2 O5

S. Mansouri; S. Jandl; M. Balli; P. Fournier; Y. Ishii; H. Kimura; M. Orlita; M. Chaker

doi:10.1103/PhysRevB.100.085147

Origin of the enhanced ferroelectricity in multiferroic SmM n2 O5

S. Mansouri, S. Jandl, M. Balli, P. Fournier, Y. Ishii, H. Kimura, M. Orlita, M. Chaker

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Abstract

In orthorhombic SmMn2O5 single crystals, Sm3+ crystal-field (CF) excitations are studied by infrared transmission as a function of temperature and under applied magnetic field up to 10 T. These measurements are complemented with the study of Raman-active phonon frequency shifts as a function of temperature between 300 and 5 K. The frequencies of all Hj6 crystal-field levels of Sm3+ were determined as well as those of Fj6. At high temperatures, the evolutions of Sm3+ CF excitations exhibit anomalies around the characteristic temperatures, T∗∼60K and TS∼120K and reflect the thermal disorder induced by splitting of the Sm-O bonds in SmMn2O5 that contribute to the frequency and linewidth phonon shifting. At low temperatures, the degeneracy of the ground-state Kramers doublet is lifted (Δ0∼36cm-1) due to the Sm3+-Mn3+ interaction in the ferroelectric phase and strongly enhanced below TC∼26K. The Sm-Mn exchange interaction J6 is determined and compared to that of Gd-Mn interaction in GdMn2O5. The Sm magnetic moment mSm(T) and the Sm contribution to the magnetic susceptibility are also evaluated from Δ0(T), indicating that the Sm-Mn interaction is strongly implicated in the magnetic and the ferroelectric orderings below ∼26K. The study of the Sm3+ CF excitations as a function of magnetic field reveals twinning in SmMn2O5. This twinning could affect its electric polarization behavior versus magnetic field.

Original language	English
Article number	085147
Journal	Physical Review B
Volume	100
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.100.085147
Publication status	Published - 2019 Aug 30

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.100.085147

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@article{d34c2f7d9d0a4bfb8466f96a0a22613c,

title = "Origin of the enhanced ferroelectricity in multiferroic SmM n2 O5",

abstract = "In orthorhombic SmMn2O5 single crystals, Sm3+ crystal-field (CF) excitations are studied by infrared transmission as a function of temperature and under applied magnetic field up to 10 T. These measurements are complemented with the study of Raman-active phonon frequency shifts as a function of temperature between 300 and 5 K. The frequencies of all Hj6 crystal-field levels of Sm3+ were determined as well as those of Fj6. At high temperatures, the evolutions of Sm3+ CF excitations exhibit anomalies around the characteristic temperatures, T∗∼60K and TS∼120K and reflect the thermal disorder induced by splitting of the Sm-O bonds in SmMn2O5 that contribute to the frequency and linewidth phonon shifting. At low temperatures, the degeneracy of the ground-state Kramers doublet is lifted (Δ0∼36cm-1) due to the Sm3+-Mn3+ interaction in the ferroelectric phase and strongly enhanced below TC∼26K. The Sm-Mn exchange interaction J6 is determined and compared to that of Gd-Mn interaction in GdMn2O5. The Sm magnetic moment mSm(T) and the Sm contribution to the magnetic susceptibility are also evaluated from Δ0(T), indicating that the Sm-Mn interaction is strongly implicated in the magnetic and the ferroelectric orderings below ∼26K. The study of the Sm3+ CF excitations as a function of magnetic field reveals twinning in SmMn2O5. This twinning could affect its electric polarization behavior versus magnetic field.",

author = "S. Mansouri and S. Jandl and M. Balli and P. Fournier and Y. Ishii and H. Kimura and M. Orlita and M. Chaker",

note = "Funding Information: We acknowledge the technical support of M. Castonguay, S. Pelletier, J. Rousseau, and B. Rivard. S.M., S.J., M.B., and P.F. acknowledge the support from the National Science and Engineering Research Council of Canada, the Fonds de Recherche du Quebec - Nature et Technologies (FRQNT), and Canada Foundation for Innovation. This research was undertaken thanks in part to funding from the Canada First Research Excellence Fund (CFREF). Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

year = "2019",

month = aug,

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doi = "10.1103/PhysRevB.100.085147",

language = "English",

volume = "100",

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TY - JOUR

T1 - Origin of the enhanced ferroelectricity in multiferroic SmM n2 O5

AU - Mansouri, S.

AU - Jandl, S.

AU - Balli, M.

AU - Fournier, P.

AU - Ishii, Y.

AU - Kimura, H.

AU - Orlita, M.

AU - Chaker, M.

N1 - Funding Information: We acknowledge the technical support of M. Castonguay, S. Pelletier, J. Rousseau, and B. Rivard. S.M., S.J., M.B., and P.F. acknowledge the support from the National Science and Engineering Research Council of Canada, the Fonds de Recherche du Quebec - Nature et Technologies (FRQNT), and Canada Foundation for Innovation. This research was undertaken thanks in part to funding from the Canada First Research Excellence Fund (CFREF). Publisher Copyright: © 2019 American Physical Society.

PY - 2019/8/30

Y1 - 2019/8/30

N2 - In orthorhombic SmMn2O5 single crystals, Sm3+ crystal-field (CF) excitations are studied by infrared transmission as a function of temperature and under applied magnetic field up to 10 T. These measurements are complemented with the study of Raman-active phonon frequency shifts as a function of temperature between 300 and 5 K. The frequencies of all Hj6 crystal-field levels of Sm3+ were determined as well as those of Fj6. At high temperatures, the evolutions of Sm3+ CF excitations exhibit anomalies around the characteristic temperatures, T∗∼60K and TS∼120K and reflect the thermal disorder induced by splitting of the Sm-O bonds in SmMn2O5 that contribute to the frequency and linewidth phonon shifting. At low temperatures, the degeneracy of the ground-state Kramers doublet is lifted (Δ0∼36cm-1) due to the Sm3+-Mn3+ interaction in the ferroelectric phase and strongly enhanced below TC∼26K. The Sm-Mn exchange interaction J6 is determined and compared to that of Gd-Mn interaction in GdMn2O5. The Sm magnetic moment mSm(T) and the Sm contribution to the magnetic susceptibility are also evaluated from Δ0(T), indicating that the Sm-Mn interaction is strongly implicated in the magnetic and the ferroelectric orderings below ∼26K. The study of the Sm3+ CF excitations as a function of magnetic field reveals twinning in SmMn2O5. This twinning could affect its electric polarization behavior versus magnetic field.

AB - In orthorhombic SmMn2O5 single crystals, Sm3+ crystal-field (CF) excitations are studied by infrared transmission as a function of temperature and under applied magnetic field up to 10 T. These measurements are complemented with the study of Raman-active phonon frequency shifts as a function of temperature between 300 and 5 K. The frequencies of all Hj6 crystal-field levels of Sm3+ were determined as well as those of Fj6. At high temperatures, the evolutions of Sm3+ CF excitations exhibit anomalies around the characteristic temperatures, T∗∼60K and TS∼120K and reflect the thermal disorder induced by splitting of the Sm-O bonds in SmMn2O5 that contribute to the frequency and linewidth phonon shifting. At low temperatures, the degeneracy of the ground-state Kramers doublet is lifted (Δ0∼36cm-1) due to the Sm3+-Mn3+ interaction in the ferroelectric phase and strongly enhanced below TC∼26K. The Sm-Mn exchange interaction J6 is determined and compared to that of Gd-Mn interaction in GdMn2O5. The Sm magnetic moment mSm(T) and the Sm contribution to the magnetic susceptibility are also evaluated from Δ0(T), indicating that the Sm-Mn interaction is strongly implicated in the magnetic and the ferroelectric orderings below ∼26K. The study of the Sm3+ CF excitations as a function of magnetic field reveals twinning in SmMn2O5. This twinning could affect its electric polarization behavior versus magnetic field.

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U2 - 10.1103/PhysRevB.100.085147

DO - 10.1103/PhysRevB.100.085147

M3 - Article

AN - SCOPUS:85072577091

SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 8

M1 - 085147

ER -

Origin of the enhanced ferroelectricity in multiferroic SmM n2 O5

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