Spin-phonon coupling in epitaxial Sr.sub.0.6./sub.Ba.sub.0.4./sub.MnO.sub.3./sub. thin films

0474017 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Goian, Veronica - Langenberg, E. - Marcano, N. - Bovtun, Viktor - Maurel, L. - Kempa, Martin - Prokscha, T. - Kroupa, Jan - Algarabel, P.A. - Pardo, J.A. - Kamba, Stanislav
Spin-phonon coupling in epitaxial Sr_0.6Ba_0.4MnO₃ thin films.
Physical Review B. Roč. 95, č. 7 (2017), 1-7, č. článku 075126. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA MŠMT(CZ) LH15122; GA ČR GA15-08389S; GA ČR GP14-14122P
Institucionální podpora: RVO:68378271
Klíčová slova: multiferroics * phonons * IR spectroscopy * muon-spin spectroscopy
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 3.813, rok: 2017

In this work we focus on the Sr0.6Ba0.4MnO3composition grown on (LaAlO3)0.3(Sr2AlTaO6)0.7 substrate. The MW complex electromagnetic response shows a decrease in the real part and a clear anomaly in the imaginary part around 150 K. Moreover, it coincides with a 17% hardening of the lowest-frequency polar phonon seen in IR reflectance spectra. Low-energy muon-spin spectroscopy was carried out, signaling the emergence of antiferromagnetic order with Néel temperature (TN) around 150 K. Thus, our results confirm that epitaxial Sr0.6Ba0.4MnO3 thin films display strong spin-phonon coupling below TN.
Trvalý link: http://hdl.handle.net/11104/0271110