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Under the terms of the Creative Commons Attribution license.-- et al.Spin-phonon coupling is investigated in epitaxially strained Sr1-xBaxMnO3 thin films with perovskite structure by means of microwave (MW) and infrared (IR) spectroscopy. In this work we focus on the Sr0.6Ba0.4MnO3 composition 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. In order to further elucidate this phenomenon, 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, which may stimulate further research on tuning the magnetoelectric coupling by controlling the epitaxial strain and chemical pressure in the Sr1-xBaxMnO3 system.Part of this work was supported by the Czech Science Foundation (Projects No. 14-14122P and No. 15–08389S) and by MSMT KONTAKT II project LH 15122. Financial support from Spanish Ministerio de Economía y Competitividad through project MAT2014-51982-C2 and from regional Gobierno de Aragon through project E26 including FEDER funding is also acknowledged.Peer Reviewe

physical review. b./physical review. b

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Spin-phonon coupling in epitaxialSr0.6Ba0.4MnO3…