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This study probes the temperature-dependent strain that is strongly correlated with the orbital and magnetic structures of epitaxial films of Nd 0.35 Sr 0.65 MnO 3  (NSMO) that are fabricated by pulsed laser deposition with two thicknesses, 17 (NS17) and 103 nm (NS103) on SrTiO 3  (STO) substrate. This investigation is probed using X-ray diffraction (XRD) and absorption-based techniques, X-ray linear dichroism (XLD) and the X-ray magnetic circular dichroism (XMCD). XRD indicates a significant shift in the (004) peak position that is associated with larger strain in NS17 relative to that of NS103 at both 30 and 300 K. Experimental and atomic multiplet simulated temperature-dependent Mn  L  3,2 -edge XLD results reveal that the stronger strain in a thinner NS17 film causes less splitting of Mn 3 d e   g   state at low temperature, indicating an enhancement of orbital fluctuations in the band above the Fermi level. This greater Mn 3 d  orbital fluctuation can be the cause of both the enhanced ferromagnetism (FM) as a result of spin moments and the reduced Néel temperature of  C -type antiferromagnetism (AFM) in NS17, leading to the FM coupling of the canted-antiferromagnetism (FM- c AFM) state in NSMO/STO epitaxial films at low temperature (T = 30 K). These findings are also confirmed by Mn  L  3,2 -edge XMCD measurements.

Strain effect on orbital and magnetic structures of Mn ions in epitaxial Nd0.35Sr0.65MnO3/SrTiO3 films using X-ray diffraction and absorption