Conditions for the growth of smooth La0.7Sr0.3MnO3 thin films by pulsed electron ablation

Graziosi, Patrizio; Prezioso, M.; Gambardella, Alessandro; Kitts, Catherine C.; Rakshit, R. K.; Riminucci, Alberto; Bergenti, I.; Borgatti, F.; Pernechele, C.; Solzi, M.; Pullini, D.; Busquets-Mataix, D.; Dediu, V.

doi:10.1016/j.tsf.2013.02.008

Cited by 30 publications

(42 citation statements)

References 49 publications

(67 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the samples featuring the MIT, is shown, while for the sample featuring a metal-metal transition, the C P M coefficient is reported and for the 40 nm film on NGO the values of the (ruled out) R 5 coefficient is also reported. The transition width is relatively broad (25-40 K), in agreement with M(T ) measurements [48].…”

Section: One Comes To the Final Expression For The Metallic Branch R supporting

confidence: 88%

“…We show in this paper that transport in high-quality LSMO thin films is fully compatible with the polaron picture, when properly constructed, which provides an excellent fit with physically meaningful and realistic parameters. LSMO epitaxial thin films were deposited by channel-spark ablation on SrTiO 3 (100) (STO) and NdGaO 3 (110) (NGO) substrates [48]. The R(T ) measurements were performed in a closed-cycle helium cryostat with four contacts made by silver paste [45].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Polaron framework to account for transport properties in metallic epitaxial manganite films

et al. 2014

Self Cite

View full text Add to dashboard Cite

We propose a model for the consistent interpretation of the transport behavior of manganese perovskites in both the metallic and insulating regimes. The concept of polarons as charge carriers in the metallic ferromagnetic phase of manganites also solves the conflict between transport models, which usually neglects polaron effects in the metallic phase, and, on the other hand, optical conductivity, angle-resolved spectroscopy, and neutron scattering measurements, which identify polarons in the metallic phase of manganites down to 6 K. Transport characterizations of epitaxial La 0.7 Sr 0.3 MnO 3 thin films in the thickness range of 5-40 nm and temperature interval of 25-410 K have been accurately collected. We show that taking into account polaron effects allows us to achieve an excellent fit of the transport curves in the whole temperature range. The current carriers density collapse picture accurately accounts for the properties variation across the metal-insulator transitions. The electron-phonon coupling parameter γ estimations are in a good agreement with theoretical predictions. The results promote a clear and straightforward quantitative description of the manganite films involved in charge transport device applications and promises to describe other oxide systems involving a metal-insulator transition. Ferromagnetic manganites are a prototypical example of the so-called half-metallic materials, i.e., materials with 100% spin polarization at 0 K. Although their possible application in commercial spintronics is prevented by a relatively low Curie temperature (T C 370 K), manganites represent an ideal laboratory tool to test spin transport in various materials and to search for pioneering device paradigms [1,2]. Thus, the use of manganites have significantly contributed to the field of organic spintronics, where almost half of the reported devices have La 0.7 Sr 0.3 MnO 3 (LSMO) as an injector [3]. In this context, revealing in a most exhaustive and comprehensive way, the transport properties of these materials looks both captivating and thought provoking.The transport properties of manganites are strongly linked to their ferromagnetism and are generally described in the framework of the so-called double-exchange mechanism: below T C the exchange interaction between Mn cations through oxygen anions favors ferromagnetism and electron delocalization along the Mn-O-Mn bonds, while above T C , thermal disorder disrupts this delocalization leading to a metal-insulator transition (MIT) [4]. Nevertheless, this basic picture appears to be conceptually insufficient to describe the physics of manganites, in general, and LSMO, in particular [5]: the strong role of polaron effects in manganites has been pointed out [6], and good experimental evidence has been provided by a variety of methods [6][7][8][9][10][11][12][13]. Moreover, manganites were proposed as an example of a polaron Fermi liquid [7].Although the presence of polarons in the metallic phase of LSMO (down to 6 K) has been demonstrated by optical * patrizio.gr...

show abstract

Section: One Comes To the Final Expression For The Metallic Branch R supporting

confidence: 88%

mentioning

confidence: 99%

Polaron framework to account for transport properties in metallic epitaxial manganite films

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…High quality colossal magnetoresistance manganite LSMO films were grown on cubic ( a = 3.905Å) SrTiO 3 (STO) substrates using the channel spark ablation (CSA) technique262728. Bulk LSMO is rhombohedral at RT with a pseudocubic parameter a = 3.873Å and a distorted pseudo-cubic angle α = 90.26°29.…”

Section: Methodsmentioning

confidence: 99%

Surface Nanostructures in Manganite Films

Gambardella

Graziosi

Bergenti

et al. 2014

Sci Rep

Self Cite

View full text Add to dashboard Cite

Ultrathin manganite films are widely used as active electrodes in organic spintronic devices. In this study, a scanning tunnelling microscopy (STM) investigation with atomic resolution revealed previously unknown surface features consisting of small non-stoichiometric islands. Based upon this evidence, a new mechanism for the growth of these complex materials is proposed. It is suggested that the non-stoichiometric islands result from nucleation centres that are below the critical threshold size required for stoichiometric crystalline growth. These islands represent a kinetic intermediate of single-layer growth regardless of the film thickness, and should be considered and possibly controlled in manganite thin-film applications.

show abstract

“…Details on the substrate cleaning procedure and on film deposition have been previously reported elsewhere 10 . Films deposited at T dep ∼ 1000 K without the seed layer and films deposited at T dep ∼ 1100 K with the seed layer are not shown because the morphology is not distinguishable from the ones reported here for the same T dep .…”

mentioning

confidence: 96%

Seed layer technique for high quality epitaxial manganite films

et al. 2016

Self Cite

View full text Add to dashboard Cite

We introduce an innovative approach to the simultaneous control of growth mode and magnetotransport properties of manganite thin films, based on an easy-to-implement film/substrate interface engineering. The deposition of a manganite seed layer and the optimization of the substrate temperature allows a persistent bi-dimensional epitaxy and robust ferromagnetic properties at the same time. Structural measurements confirm that in such interface-engineered films, the optimal properties are related to improved epitaxy. A new growth scenario is envisaged, compatible with a shift from heteroepitaxy towards pseudo-homoepitaxy. Relevant growth parameters such as formation energy, roughening temperature, strain profile and chemical states are derived.

show abstract

Conditions for the growth of smooth La0.7Sr0.3MnO3 thin films by pulsed electron ablation

Cited by 30 publications

References 49 publications

Polaron framework to account for transport properties in metallic epitaxial manganite films

Polaron framework to account for transport properties in metallic epitaxial manganite films

Surface Nanostructures in Manganite Films

Seed layer technique for high quality epitaxial manganite films

Contact Info

Product

Resources

About