Spin-phonon coupling in epitaxial Sr&lt;sub&gt;0.6&lt;/sub&gt;Ba&lt;sub&gt;0.4&lt;/sub&gt;MnO&lt;sub&gt;3&lt;/sub&gt; thin films

Goian, V.; Langenberg, E.; Marcano, N.; Bovtun, V.; Maurel, L.; Kempa, M.; Prokscha, T.; Kroupa, J.; Algarabel, P.A.; Pardo, J.A.; Kamba, S.

doi:10.1103/PhysRevB.95.075126

Spin-phonon coupling in epitaxial Sr_0.6Ba_0.4MnO₃ thin films

Goian V, Langenberg E, Marcano N, Bovtun V, Maurel L, Kempa M, Prokscha T, Kroupa J, Algarabel PA, Pardo JA & Kamba S

Citation

Goian, V., Langenberg, E., Marcano, N., Bovtun, V., Maurel, L., Kempa, M., … Kamba, S. (2017). Spin-phonon coupling in epitaxial Sr_0.6Ba_0.4MnO₃ thin films. Physical Review B, 95(7), 075126 (7 pp.). https://doi.org/10.1103/PhysRevB.95.075126

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:4239

Spin-phonon coupling is investigated in epitaxially strained Sr_1-xBa_xMnO₃ thin films with perovskite structure by means of microwave (MW) and infrared (IR) spectroscopy. In this work we focus on the Sr_0.6Ba_0.4MnO₃ 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 (T_N) around 150 K. Thus, our results confirm that epitaxial Sr_0.6Ba_0.4MnO₃ thin films display strong spin-phonon coupling below T_N, which may stimulate further research on tuning the magnetoelectric coupling by controlling the epitaxial strain and chemical pressure in the Sr_1-xBa_xMnO₃ system.