Fabrication of hybrid thin film structures from HTS and CMR materials

Sojková, M.; Štrbı́k, V.; Nurgaliev, T.; Chromík, Š.; Dobročka, Edmund; Španková, M.; Blagoev, B.; Gál, N.

doi:10.1088/1742-6596/700/1/012022

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…• (see for example [2]). The temperature dependences of the resistance (R vs. T dependence) of the strips and of the interface in the crossing area were measured using a DC four probe method and analyzed in terms of the interaction of the HTS and FM layers.…”

Section: Methodsmentioning

confidence: 99%

LSMO/YBCO Heterostructures and Investigation of "Negative" Resistance Effect in the Interface

et al. 2017

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Samples containing the ferromagnetic manganite La0.67Sr0.33MnO3 (LSMO) and high temperature superconducting YBa2Cu3O7 (YBCO) single thin film areas and YBCO/LSMO bilayer area were prepared on LaAlO3 (LAO) substrates and were used for investigation of the electrical properties of the interface. The measurements in the YBCO/LSMO interface demonstrated "negative" values of the resistance. A good interpretation of the obtained results was performed in the framework of a 1D model, which took into account the resistance of the interface R if and the temperature dependence of the resistance of YBCO and LSMO films. It was shown that the effect of "negative" resistance arises because of the redistribution of the measuring electrical current in the interphase area if the resistance of the interface R if is small in comparison with the resistances of the neighboring electrodes.

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Section: Methodsmentioning

confidence: 99%

LSMO/YBCO Heterostructures and Investigation of "Negative" Resistance Effect in the Interface

et al. 2017

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“…First, a 25-40-nm-thick LSMO film was deposited on a MgO single-crystal substrate. The as-prepared ferromagnetic LSMO thin film was patterned as a base electrode of a junction using standard photolithography processes and etched by a solution of potassium iodide, hydrochloric and ascorbic acid [11]. Subsequently, a superconducting YBCO thin film with a thickness of about 50-70 nm was prepared on the MgO substrate with patterned LSMO.…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, a superconducting YBCO thin film with a thickness of about 50-70 nm was prepared on the MgO substrate with patterned LSMO. Then, standard photolithography processes and wet etching (0.1 % solution of nitric acid) were used to pattern the YBCO as a counter electrode [11]. A schematic view of the sample with three junctions of different areas on one chip is shown in the inset of figure 1.…”

Section: Methodsmentioning

confidence: 99%

Properties of LSMO/YBCO cross-strip type junctions

Štrbı́k

Nurgaliev

Sojková

et al. 2018

J. Phys.: Conf. Ser.

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Resistance vs. temperature and current-voltage dependences, as well as conductance spectra, were used to characterize the electrical parameters of the interface. The results indicated a low resistance (below 10 ), while the dielectric properties of the interface pointed to the presence of a 10-nm wide and 40-meV high dielectric potential barrier. The oxygen vacancies in both LSMO and YBCO films at the interface and the charge transfer through the interface were both considered to explain the insulating character of the LSMO/YBCO interface. IntroductionDepending on their composition and structural properties, perovskite materials can behave as dielectrics, conventional metals, or high-temperature superconducting (HTS), colossal magnetoresistive (CMR), ferroelectric or multiferroic materials. Therefore, such materials, and especially the CMR/HTS interface, are attractive for studying the interplay between two fundamental condensed-matter phenomena, superconductivity (S) and ferromagnetism (F). Recent developments in fabricating atomically smooth (flat) CMR/HTS interfaces in superlattices [1,2] provided an ideal system to investigate intriguing phenomena, such as a long-range proximity effect [3,4], spinpolarized quasiparticle injection into the HTS layer within a spin-diffusion length  FM [5], giant modulation of the CMR-layer magnetization induced by superconductivity [6], or charge transfer from CMR into HTS [7,8,9]. A variety of effects and phenomena at the SF interface offer possibilities of using these materials in different microelectronic and spintronic applications [10].In this work we studied a La 0.67 Sr 0.33 MnO 3 (LSMO) / YBa 2 Cu 3 O 7- (YBCO) interface in the form of cross-strip type junction by means of electrical characterization, namely, the resistance vs. temperature (R(T)) dependences, and the current-voltage (I(V)) and differential conductance vs. voltage (dI/dV(V)) characteristics. The results obtained indicate an insulating (dielectric) character of the interface in spite

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Fabrication of hybrid thin film structures from HTS and CMR materials

Cited by 2 publications

References 12 publications

LSMO/YBCO Heterostructures and Investigation of "Negative" Resistance Effect in the Interface

LSMO/YBCO Heterostructures and Investigation of "Negative" Resistance Effect in the Interface

Properties of LSMO/YBCO cross-strip type junctions

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