We have studied the effect of biaxial strain on thin films of (001) La0.7Sr0.3MnO3. We deposited films by reactive molecular-beam epitaxy on different single crystalline substrates, varying the substrate-induced biaxial strain from −2.3% to +3.2%. Magnetization and electrical transport measurements reveal that the dependence of the Curie temperature on biaxial strain is in very good agreement with the theoretical predictions of Millis et al

Articles you may be interested inPrediction of giant magnetoelectric effect in LaMnO3/BaTiO3/SrMnO3 superlattice: The role of n-type SrMnO3/LaMnO3 interface High mobility half-metallicity in the (LaMnO3)2/(SrTiO3)8 superlattice Appl. Phys. Lett. 102, 042401 (2013); 10.1063/1.4789506 Magnetic and transport characteristics of long-period [(LaMnO3)n/(SrMnO3)n]m (n≥3) superlatticesWe report the magnetic and transport properties of ͓͑SrMnO 3 ͒ n / ͑LaMnO 3 ͒ 2n ͔ m superlattices grown by molecular-beam epitaxy on ͑100͒ SrTiO 3 with periodicities n =1, 2, 3, 4, 5, 6, 8, and 16. Although the superlattice constituents, LaMnO 3 and SrMnO 3 , are both antiferromagnetic insulators, for small n ͑n ഛ 2͒ the superlattices behave like the ferromagnetic conductor La 0.67 Sr 0.33 MnO 3 . As n increases, the magnetic properties become dominated by the LaMnO 3 layers, but the electronic transport properties continue to be controlled by the interfaces.

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The magnetic and electronic modifications induced at the interfaces in (SrMnO3)n/(LaMnO3)2n superlattices have been investigated by linear and circular magnetic dichroism in the Mn L2,3 x-ray absorption spectra. Together with theoretical calculations, our data demonstrate that the charge redistribution across interfaces favors in-plane ferromagnetic (FM) order and eg(x 2 − y 2 ) orbital occupation, in agreement with the average strain. Far from interfaces, inside LaMnO3, electron localization and local strain favor antiferromagnetism (AFM) and eg(3z 2 − r 2 ) orbital occupation. For n = 1 the high density of interfacial planes ultimately leads to dominant FM order forcing the residual AFM phase to be in-plane too, while for n ≥ 5 the FM layers are separated by AFM regions having out-of-plane spin orientation.PACS numbers: 75.47. Lx, 78.70.Dm, 72.10.Di, 73.21.Cd, Interfaces between different transition metal oxides (TMO) have been widely demonstrated to be sources of interesting and unexpected electronic and magnetic properties.Metallic conductivity arises, for example, at the interface between two insulators, such as LaAlO 3 /SrTiO 3 [1] and LaTiO 3 /SrTiO 3 [2], while ferromagnetism (FM) occurs at the interface between the antiferromagnet (AFM) CaMnO 3 and the paramagnet CaRuO 3 [3]. In this context, strain driven spin-orbital coupled states arising in manganites make the interfaces between these compounds very interesting for engineering unique collective states. As a matter of fact, a certain amount of theoretical and experimental studies on superlattices (SLs) composed by the two AFM insulators, SrMnO 3 (SMO) and LaMnO 3 (LMO), appeared in literature during the last years [4,5,6,7,8,9,10,11,12]. The ordered sequence of the atomic layers in the digital SMO/LMO SLs [4,5], together with the electronic reconstruction arising from the interfacial Mn 3+ /Mn 4+ mixed valence, give rise to peculiar transport, magnetic and orbital properties, when different layering and strain conditions occur. In the particular case of (SMO) n /(LMO) 2n the La:Sr ratio is 2:1, in analogy with the optimal composition of La 2/3 Sr 1/3 MnO 3 (LSMO). In such a case, the metal-insulator transition (MIT) and the magnetic properties depend on the thickness of the constituent blocks [4,5,6,7], although in a non trivial way. Indeed, saturation magnetization does not linearly decrease with n [4] and both fast and viscous spin populations are present, the latter associated to FM/AFM pinning [8]. Therefore, the development of the FM metallic phase at the interfaces is well established and the coexistance of the FM and AFM phases was inferred. However, the knowledge of the mutual dependence of the AFM and FM phases with n is still uncertain, but it could open further perspectives in the control of the low dimensional magnetic properties, thus in the engineering of the TMO magnetic heterostructures. In addition, as the role of interfacial Mn e g electrons is known to be important, the influence of strain and reduced dimensionality on the transpor...

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