Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius
Two series of B-site ordered, double-perovskite A<sub>2</sub>CoMnO<sub>6</sub> and A<sub>2</sub>NiMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd) epitaxial films with thickness d ~ 100 nm were grown on SrTiO<sub>3</sub>(111) substrates via metalor...
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MDPI AG
2021-06-01
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| Online Access: | https://www.mdpi.com/2073-4352/11/7/747 |
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| author | Christoph Meyer Philipp Ksoll Vladimir Roddatis Vasily Moshnyaga |
| author_facet | Christoph Meyer Philipp Ksoll Vladimir Roddatis Vasily Moshnyaga |
| author_sort | Christoph Meyer |
| collection | DOAJ |
| description | Two series of B-site ordered, double-perovskite A<sub>2</sub>CoMnO<sub>6</sub> and A<sub>2</sub>NiMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd) epitaxial films with thickness d ~ 100 nm were grown on SrTiO<sub>3</sub>(111) substrates via metalorganic aerosol deposition. Polarization and temperature-dependent Raman spectroscopy were carried out in order to determine the spin-phonon coupling constant, λ, and the impact of the A-site cation radius on the phonon properties. The reduction of the A-site cation radius from La<sup>3+</sup> down to Gd<sup>3+</sup> systematically shifts the Raman modes to lower wavenumbers, and decreases the magnetization-induced softening of the Ag breathing mode, described by the spin-phonon coupling constant, λ, which changes from λ = 1.42 cm<sup>−1</sup> (La<sub>2</sub>CoMnO<sub>6</sub>) and λ = 1.53 cm<sup>−1</sup> (La<sub>2</sub>NiMnO<sub>6</sub>) down to λ = 0.58 cm<sup>−1</sup> (Gd<sub>2</sub>CoMnO<sub>6</sub>) and λ = 0.44 cm<sup>−1</sup> (Gd<sub>2</sub>NiMnO<sub>6</sub>). A similar effect of the A-cation radius was established for the c-lattice parameter and Curie temperature, TC, in this series of double-perovskite films. Our observations directly demonstrate a strong impact of the lattice structure on the ferromagnetic superexchange interaction in double perovskites. Moreover, the A<sub>2</sub>CoMnO<sub>6</sub> and A<sub>2</sub>NiMnO<sub>6</sub> series exhibit very similar behavior of spin-phonon coupling due to the only moderate difference of Co<sup>2+</sup> and Ni<sup>2+</sup> cation size. |
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| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T10:01:56Z |
| publishDate | 2021-06-01 |
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| spelling | doaj.art-bb44086733234dea9e3dbc1737f176b72023-11-22T01:52:36ZengMDPI AGCrystals2073-43522021-06-0111774710.3390/cryst11070747Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation RadiusChristoph Meyer0Philipp Ksoll1Vladimir Roddatis2Vasily Moshnyaga3Erstes Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, GermanyErstes Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, GermanyInstitut für Materialphysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, GermanyErstes Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, GermanyTwo series of B-site ordered, double-perovskite A<sub>2</sub>CoMnO<sub>6</sub> and A<sub>2</sub>NiMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd) epitaxial films with thickness d ~ 100 nm were grown on SrTiO<sub>3</sub>(111) substrates via metalorganic aerosol deposition. Polarization and temperature-dependent Raman spectroscopy were carried out in order to determine the spin-phonon coupling constant, λ, and the impact of the A-site cation radius on the phonon properties. The reduction of the A-site cation radius from La<sup>3+</sup> down to Gd<sup>3+</sup> systematically shifts the Raman modes to lower wavenumbers, and decreases the magnetization-induced softening of the Ag breathing mode, described by the spin-phonon coupling constant, λ, which changes from λ = 1.42 cm<sup>−1</sup> (La<sub>2</sub>CoMnO<sub>6</sub>) and λ = 1.53 cm<sup>−1</sup> (La<sub>2</sub>NiMnO<sub>6</sub>) down to λ = 0.58 cm<sup>−1</sup> (Gd<sub>2</sub>CoMnO<sub>6</sub>) and λ = 0.44 cm<sup>−1</sup> (Gd<sub>2</sub>NiMnO<sub>6</sub>). A similar effect of the A-cation radius was established for the c-lattice parameter and Curie temperature, TC, in this series of double-perovskite films. Our observations directly demonstrate a strong impact of the lattice structure on the ferromagnetic superexchange interaction in double perovskites. Moreover, the A<sub>2</sub>CoMnO<sub>6</sub> and A<sub>2</sub>NiMnO<sub>6</sub> series exhibit very similar behavior of spin-phonon coupling due to the only moderate difference of Co<sup>2+</sup> and Ni<sup>2+</sup> cation size.https://www.mdpi.com/2073-4352/11/7/747double perovskitesthin filmsRaman spectroscopyspin-phonon coupling |
| spellingShingle | Christoph Meyer Philipp Ksoll Vladimir Roddatis Vasily Moshnyaga Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius Crystals double perovskites thin films Raman spectroscopy spin-phonon coupling |
| title | Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius |
| title_full | Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius |
| title_fullStr | Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius |
| title_full_unstemmed | Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius |
| title_short | Spin-Phonon Coupling in A<sub>2</sub>BMnO<sub>6</sub> (A = La, Pr, Nd, Sm, Gd; B = Co, Ni) Double-Perovskite Thin Films: Impact of the A-Site Cation Radius |
| title_sort | spin phonon coupling in a sub 2 sub bmno sub 6 sub a la pr nd sm gd b co ni double perovskite thin films impact of the a site cation radius |
| topic | double perovskites thin films Raman spectroscopy spin-phonon coupling |
| url | https://www.mdpi.com/2073-4352/11/7/747 |
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