Electron transport in hybrid superconductor heterostructures with manganite interlayers

Petrzhik, A. M.; Ovsyannikov, G. A.; Shadrin, A. V.; Konstantinyan, K. I.; Av, Zaĭtsev; Демидов, В. В.; Kislinskiĭ, Yu. V.

doi:10.1134/s1063776111050177

Cited by 15 publications

(14 citation statements)

References 30 publications

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“…This is much larger than the coherence length of the ferromagnets ξ F ß5 nm estimated for LSMO and SRO films [36]. Control measurements of the mesa structure with only the LSMO [17] or the SRO layer [36] showed that the critical current is absent (except in cases of pinholes) if the SRO and LSMO films are thicker than several nanometers. The critical current density j C decreases by an order of magnitude, when increasing d M from 8.5 to 53 nm.…”

Section: Josephson Current In Mesa Structuresmentioning

confidence: 88%

“…[14,15] reported evidence of long-range triplet superconducting correlations from Andreev reflections in structures with a La 0.7 Ca 0.3 MnO 3 ferromagnetic layer. Other experiments on similar structures, however, did not reveal superconducting currents (beyond those transmitted through pinholes) [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic measurements were conducted using a SQUID magnetometer in the temperature range from 10 to 300 K. The structural properties of the samples were determined by x-ray low-angle (reflectivity) and high-angle diffraction patterns on a Rigaku diffractometer with rotating anode. The magnetic field dependent dc resistance was measured on the mesa structures patterned using photolithography and plasma chemical and ion etching [17,36,37]. The Josephson current in the mesa structures was measured using a four-point measurement scheme and magnetic field shielding by amorphous μ-metal foil in a microwave screened environment.…”

Section: Sample Fabrication and Experimental Techniquesmentioning

confidence: 99%

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Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with noncollinear magnetization

et al. 2014

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Heterostructures composed of ferromagnetic La 0.7 Sr 0.3 MnO 3 , ferromagnetic SrRuO 3 , and superconducting YBa 2 Cu 3 O 6+x were studied experimentally. Structures of composition Au/La 0.7 Sr 0.3 MnO 3 /SrRuO 3 / YBa 2 Cu 3 O 6+x were prepared by pulsed laser deposition, and their high quality was confirmed by x-ray diffraction and reflectometry. A noncollinear magnetic state of the heterostructures was revealed by means of superconducting quantum interference device magnetometry and polarized neutron reflectometry. We have further observed superconducting currents in mesa structures fabricated by deposition of a second superconducting Nb layer on top of the heterostructure, followed by patterning with photolithography and ion-beam etching. Josephson effects observed in these mesa structures can be explained by the penetration of a triplet component of the superconducting order parameter into the magnetic layers.

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Section: Josephson Current In Mesa Structuresmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Sample Fabrication and Experimental Techniquesmentioning

confidence: 99%

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Evidence for spin-triplet superconducting correlations in metal-oxide heterostructures with noncollinear magnetization

et al. 2014

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“…After the transition to the ferromagnetic state of the LMO layer at temperature T < 140 K, a spin-polarized current appears in the mesastructure [3] and magnetic field affects the tunneling conductivity due to spin polarization [14]. The observed value of magnetoresistance of mesa-structure is typical for manganites [12] and took place only at temperatures below the critical temperature of bilayer Au-Nb. With an increase of dc bias voltage above 3 mV (about twice higher than the niobium energy gap), the conductivity of the mesa-structure no longer depends on magnetic field [16].…”

Section: Fig1mentioning

confidence: 85%

“…Hybrid mesa-structures were prepared from epitaxial films of superconducting cuprate YBa 2 Cu 3 O x (YBCO) and manganite LaMnO 3 (LMO) -materials having good chemical and crystalline compatibility [12]. The top superconducting electrode was thin film bilayer consisting of Nb and Au film, providing the contact with LMO manganite.…”

Section: Methodsmentioning

confidence: 99%

Superconducting mesa-structures with a spin filtering manganite interlayer

et al. 2018

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Abstract. We report on current transport and magnetism in hybrid superconducting mesa-structures prepared from epitaxial superconductor YBa 2 Cu 3 O 7-δ and manganite LaMnO 3 thin films. Superconducting Au-Nb bilayer was the top electrode. Measurements of magnetic resonance in heterostructure with the only Au top electrode (without Nb) showed ferromagnetic state close to Curie temperature of LaMnO 3 , 150 K. A spin filtering was revealed by measurements of tunneling magneto-resistance. Mesa-structures had no superconducting current even at reduced temperature T=300 mK and the smallest manganite interlayer thickness, d M =5.6 nm. Varying the external magnetic field |H|<10 Oe and dc bias current |I|<0.5 mA the microwave generation with power P <1 pW with a line-width of order 50 MHz was observed in GHz frequency band. The frequency of generation could be tuned by the biasing current with a rate 10 13 Hz/A. The impact of spin polarized current on microwave generation is discussed taking into account the asymmetry of oscillation amplitudes over the applied magnetic field.

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