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

Sojková, M.; Nurgaliev, T.; Štrbı́k, V.; Chromík, Š.; Blagoev, B.; Španková, M.

doi:10.12693/aphyspola.131.842

Cited by 3 publications

(1 citation statement)

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“…Such a property can arise in junctions when the resistance of the barrier (in our case, the interface resistance R IF ) is lower than the resistances of the adjacent YBCO and LSMO layers (R S and R F , respectively). A negative value of the junction resistance R J measured by the 4-probe method was first reported by Giaever [12]; we recently analyzed one in more detail for a LSMO/YBCO interface [13]. Our analyses showed that in the case of superconducting YBCO (R S = 0), the junction resistance measured should always be positive.…”

Section: Resultssupporting

confidence: 51%

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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Section: Resultssupporting

confidence: 51%