Impact of strain on metamagnetic transitions in Sm0.5Sr0.5MnO3 thin films

Abstract

Sm 0.5 Sr 0.5 MnO 3 thin films were deposited by DC magnetron sputtering on LaAlO 3 (LAO) and SrTiO 3 (STO) substrates. The film on LAO, which is under compressive strain, undergoes paramagnetic-ferromagnetic (PM-FM) transition at T C ~116 K and shows insulator-metal transition (IMT) at T IM ~115 K. The film on STO is under tensile strain and has T C ~112 K; and shows IMT at T IM ~110 K. Around ~80 K the film on STO shows a broad peak in the resistivity that could be seen as the reentrant IMT due to appearance of a metamagnetic state, the presence of which is confirmed by the discontinuous irreversible jumps in the magnetic field dependent isothermal resistivity at T<85 K. These signatures of the metamagnetic state are not seen in the film on LAO. The occurrence and absence of metamagnetic state in films on STO and LAO, respectively has been explained in terms of the control of the competing FM metallic and antiferromagnetic-charge ordered insulating (AFM-COI) phases by the different strain states in these films.

Supercooling transition in phase separated manganite thin films: An electrical transport study

“…[1][2][3] It dominates the composition-temperature (x-T) diagram of intermediate and low bandwidth manganites like Nd 1Àx Sr x MnO 3 , 3,4 Sm 1Àx Sr x MnO 3 , 5,6 and La 1ÀxÀy Pr y Ca x MnO 3 . 7-10 Amongst these materials, La 1ÀxÀy Pr y Ca x MnO 3 has emerged as the prototypical phase separated system and its different variants like bulk single crystal, polycrystals, and thin films have been investigated.…”

Comparative study of magnetic and magnetotransport properties of Sm0.55Sr0.45MnO3 thin films grown on different substrates

“…In case of the film on LAO the surface appeared to consist of large and big granules, while in case of the films on LSAT and STO substrates the granule size are more uniform. As compared to single crystalline Sm 0.53 Sr 0.47 MnO 3 thin films prepared by DC magnetron sputtering, 19,22 the surface roughness of these polycrystalline films is relatively higher. The representative surface topographs of films on LAO and STO are presented in Fig.…”

“…Recently, it has been shown that even a very small substrate induced strain could modify the magnetotransport properties in Sm 1-x Sr x MnO 3 (x ∼ 0.5) in the FMM regime (T < T C ). 19,22 In case of textured polycrystalline thin films the nature of the strain state is expected to be drastically different from the single crystalline and epitaxial thin films. In the textured/oriented polycrystalline thin film the local epitaxial regions are interrupted by the presence of GBs and around these regions the strain, irrespective of its nature (whether it is compressive or tensile) is expected to get relaxed.…”

“…21 The impact of substrate induced strain on magnetic phase coexistence and consequent magnetotransport properties of small W material like Sm 1-x Sr x MnO 3 appears to be more dramatic. 19,22 In fact recently it has been shown that even a small strain can cause appreciable modifications in the magnetoelectric phase landscape of a low W manganite like Sm 1-x Sr x MnO 3 . 23 Recently we have studied Sm 0.55 Sr 0.45 MnO 3 (SSMO) thin films, wherein it was demonstrated that the substrate induced strain and oxygen vacancy ordering/disordering have significant impact on the magnetotransport properties.…”

Ferromagnetism, insulator-metal transition and magnetotransport in Pr0.58Ca0.42MnO3films: role of microstructural perturbations

“…3a it is clear that the appearance of FM correlations is accompanied by a huge divergence between the ZFC-FC branches. Such bifurcation of the magnetizations curves is generally regarded as the signature of the cluster glass like metamagnetic state [30][31][32][33] and has origin in the coexistence of different magnetic phases like FMM and AFM/COI.…”