Thin films of La0.7Sr0.3MnO3 on MgO show a metal insulator transition and colossal magnetoresistance. The shape this can be explained by intrinsic spatial inhomogeneities, which give rise to domain structure conducting insulating domains at the submicrometer scale. These then undergo percolation transition. tunneling conductance gap measured scanning spectroscopy were used distinguish visualize these domains.

It is generally believed that nature does not provide materials with negative refraction. Here we demonstrate experimentally such do exist at least GHz frequencies: ferromagnetic metals reveal a refraction index close to the frequency of resonance. The experimental realization utilizes colossal magnetoresistance manganite ${\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ as an example. In this material refractive can be achieved even room temperature using external magnetic fields.

Epitaxial double perovskite La2CoMnO6 (LCMO) films were grown by metalorganic aerosol deposition on SrTiO3(111) substrates. A high Curie temperature, TC = 226 K, and large magnetization close to saturation, MS(5 K) 5.8μB/f.u., indicate a 97% degree of B-site (Co,Mn) ordering within the film. The Co/Mn was directly imaged at atomic scale scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy (STEM-EDX). Local electron-energy-loss (EELS) measurements reveal that...

A chemical deposition technique based on the use of solutions metal-chelate coordination compounds has been applied to prepare rare-earth–manganite-oxide thin films. La0.67Ca0.33MnO3 and La0.67Sr0.33MnO3 films have grown epitaxially MgO(100) substrates characterized by structural (x-ray diffraction analysis, atomic force microscopy) magnetotransport (T=4.2–300 K, B=0–5 T) measurements.

We have prepared high-quality epitaxial thin films of ${\mathrm{CaRuO}}_{3}$ with residual resistivity ratios up to 55. Shubnikov--de Haas oscillations in the magnetoresistance and a ${T}^{2}$ temperature dependence electrical only below 1.5 K, coefficient which is substantially suppressed large magnetic fields, establish as Fermi liquid (FL) an anomalously low coherence scale. At $T>1.5\text{ }\text{ }\mathrm{K}$ non-Fermi-liquid (NFL) behavior found resistivity. The high sample quality...

We report an atomic layer epitaxial growth of Ruddlesden-Popper (RP) thin films SrO(SrTiO3)n (n = ∞, 2, 3, 4) by means metalorganic aerosol deposition (MAD). The are grown on SrTiO3(001) substrates a sequential Sr-O/Ti-O2 monolayers, monitored in-situ optical ellipsometry. X-ray diffraction and transmission electron microscopy (TEM) reveal the RP structure with n 2–4 in accordance recipe. defects, observed TEM good correlation ellipsometry, mainly result from excess SrO. Being maximal at...

Abstract Heterostructures of strongly correlated oxides demonstrate various intriguing and potentially useful interfacial phenomena. LaMnO 3 /SrMnO superlattices are presented showcasing a new high‐temperature ferromagnetic phase with Curie temperature, T C ≈360 K, caused by electron transfer from the surface donor layer into neighboring SrMnO acceptor layer. As result, (top)/LaMnO (bottom) interface shows an enhancement magnetization as depth‐profiled polarized neutron reflectometry. The...

Abstract LaMnO x (LMO) thin films have been prepared by low-oxygen metal-organic aerosol deposition (LOMAD). The oxygen stoichiometry was controlled the partial pressure p(O 2 ) during which is set ratio of O /N gas flow. in terms Mn 4+ /Mn 3+ determined from structural, electrical and magnetic properties. Deposition pure N leads to with x≈3.01, comparable state-of-the art PLD-grown LMO films. Overall, we show that MAD as a simple chemical thin-film method also suitable technique for...

Advanced interface engineering provides a way to control the ground state of correlated oxide heterostructures, which enables shaping future electronic and magnetic nanodevices with enhanced performance. An especially promising rather new avenue is find explore low-dimensional phases structural, ferroic superconducting origin. In this multimodal study, we present novel dynamic growth method that synthesizing compositionally graded superlattices (SLs) (LaMnO_3)_10/(SrMnO_3)_10 (LMO/SMO), in...

Engineering of artificially disordered interfaces provides an alternative way to control the ground state correlated oxide heterostructures, which enables shaping future electronic and magnetic nanodevices with enhanced performance.

Strain engineering beyond substrate limitation of colossal magnetoresistant thin (La0.6Pr0.4)0.7Ca0.3MnO3 (LPCMO) films on LaAlO3-buffered SrTiO3 (LAO/STO) substrates has been demonstrated using metalorganic aerosol deposition technique. By growing partially relaxed 7-27 nm thick heteroepitaxial LAO buffer layers STO a perfect lattice matching to the LPCMO achieved. As result, strain-free 10-20 LPCMO/LAO/STO with bulk-like ferromagnetic metallic ground state were obtained. Without coherently...

Composite $({\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}{)}_{1\ensuremath{-}x}:(\mathrm{MgO}{)}_{x}$ films were prepared by metalorganic aerosol deposition on a (100)MgO substrate for different concentrations of the (MgO) phase $(0<~x<~0.8).$ At $x\ensuremath{\approx}0.3$ percolation threshold in conductivity is reached, at which an infinite insulating MgO cluster forms around ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ grains. This yields drastic increase...

Epitaxial La3/4Ca1/4MnO3/MgO(100) (LCMO) thin films show unusual rhombohedral (R-3c) structure with a new perovskite superstructure due to unique ordering of La and Ca at the A-site positions. Very sharp insulator-metal para-ferromagnetic phase transitions temperatures up TMI ~ TC=295 K were observed. The ordered electronically homogeneous down 1 nm scale as revealed by scanning tunnelling microscopy/spectroscopy. In contrast, orthorhombic disordered LCMO demonstrate broadened well...

A long-standing issue in the physics of colossal magnetoresistance is role electron-phonon coupling, which manifests itself as Jahn-Teller polarons. The origin and architecture polarons makes it possible to study their behavior by Raman spectroscopy, allows analyze polaronic an applied magnetic field. We performed magnetic-field-dependent spectroscopy on thin films (La0.6Pr0.4)0.7Ca0.3MnO3 a range H = 0-50 kOe compared obtained spectra with field electrical resistivity. In vicinity Curie...

We report direct evidence of the theoretically predicted electron-rich surface doped perovskite manganites ${\mathrm{La}}_{0.7}{A}_{0.3}{\mathrm{MnO}}_{3}\phantom{\rule{4pt}{0ex}}(A=\text{Ca}$, Sr) by means surface-enhanced Raman spectroscopy. The required Au nanoparticles were grown on top thin manganite films metalorganic aerosol deposition technique, which provides a stable oxygen atmosphere and prevents deoxygenation effects. acquired spectra rhombohedral...

The colossal magnetoresistive manganite ${({\mathrm{La}}_{0.6}{\mathrm{Pr}}_{0.4})}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ (LPCMO) undergoes a ferromagnetic (FM) metal to paramagnetic insulator phase transition at around 195 K, which develops via an intermediate polaronic state strongly susceptible external magnetic fields. Transient reflectivity studies of LPCMO on timescales from sub-picoseconds nanoseconds reveal that the overall system dynamics are influenced by with sharp and...

Composite thin films of (La0.7Sr0.3MnO3)1−x:(MgO)x (x=0–0.5) were grown on Al2O3 (0001) substrates by a metalorganic aerosol deposition technique. A columnar growth the with predominance (111)- and (1̄10)-orientation was observed. Pure (x=0) show Curie temperature TC=362 K, metallic behavior accompanied low residual resistivity ρ∼10−4 Ω cm at T=4.2 K very small low-field magnetoresistance. Low amounts MgO doping, x=0.05, result in totally different electrical transport which is pronounced...

The metal-insulator (MI) transition in epitaxial thin films of ${\text{La}}_{0.75}{\text{Ca}}_{0.25}{\text{MnO}}_{3}$ (LCMO) is accompanied by the appearance an intrinsic electrical nonlinearity. latter, probed third harmonic voltage, ${U}_{3\ensuremath{\omega}}$, or resistance, ${R}_{3\ensuremath{\omega}}=d{U}_{3\ensuremath{\omega}}/dJ$, drastically enhanced vicinity MI transition, ${T}_{\text{MI}}=267\text{ }\text{K}$. Applied magnetic field, $B=5\text{ }\text{T}$, suppresses nonlinearity,...

A commonly believed picture of colossal magnetoresistance (CMR) effect is related to a first-order phase transition and electronic separation with coexisting ferromagnetic metallic antiferromagnetic insulating phases. However, the underlying mechanism, i.e., characteristic energy scale interacting phases their spatial extent, still under debate. Here we present experimental evidence on existence an effective coupling between nanodomains in epitaxial thin films classical CMR material...

Double perovskite $\mathrm{L}{\mathrm{a}}_{2}\mathrm{CoMn}{\mathrm{O}}_{6}$ (LCMO) thin films with the monoclinic $P{2}_{1}/n$ structure were grown on hexagonal $c$-cut sapphire substrates by metalorganic aerosol deposition technique. Epitaxial growth of $\mathrm{LCMO}(021)/\mathrm{A}{\mathrm{l}}_{2}{\mathrm{O}}_{3}(0001)$ due to an almost perfect in-plane lattice matching between LCMO and $\mathrm{A}{\mathrm{l}}_{2}{\mathrm{O}}_{3}$ was evidenced x-ray diffraction transmission electron...

Polarization‐dependent tip‐enhanced Raman spectroscopy (TERS) was carried out on double perovskite La 2 CoMnO 6 (LCMO) thin films to determine the contributions of enhancement by excitation surface plasmon polariton and tip‐induced polarization effects. Due B‐site ordering resulting monoclinic P12 1 / n1 structure, spectra exhibit a strong A g mode around 644 cm −1 originated from (Co Mn)O stretching vibrations. The TERS contrast C , defined as ratio total‐field (the sum near field far...

We present a novel setup to measure the transverse magneto-optical Kerr effect in extreme ultraviolet spectral range based on fiber laser amplifier system with repetition rate between 100 and 300 kHz, which we use element-resolved demagnetization dynamics. The is equipped strong electromagnet cryostat, allowing measurements 10 420 K using magnetic fields up 0.86 T. performance of our demonstrated by set temperature- time-dependent magnetization elemental resolution.