Spin-phonon coupling in epitaxial Sr0.6Ba0.4MnO3 thin films

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

Resumen: 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.

Idioma: Inglés

DOI: 10.1103/PhysRevB.95.075126

Año: 2017

Publicado en: Physical Review B 95, 7 (2017), 075126
ISSN: 2469-9950

Factor impacto JCR: 3.813 (2017)

Categ. JCR: PHYSICS, CONDENSED MATTER rank: 18 / 67 = 0.269 (2017) - Q2 - T1

Financiación: info:eu-repo/grantAgreement/ES/DGA/E26
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-51982-C2

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)