Current-Voltage Characteristics of YBa2Cu3Oy/La0.7Ca0.3MnOz/YBa2Cu3Oy Trilayered-Type Junctions

Kasai, Masahiro; Ohno, Toshiyuki; Kanke, Yoko; Kozono, Y.; Hanazono, M.; Sugita, Y.

doi:10.1143/jjap.29.l2219

Cited by 98 publications

(11 citation statements)

References 9 publications

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“…In this scenario, colossal magnetoresistance (CMR) is naturally explained by the superconducting fluctuation with increasing magnetic fields. This idea is closely related to the observation of anomalous proximity effect between superconducting YBCO and a manganese oxide, La 1−x Ca x MnO 3 or La 1−x Sr x MnO 3 93 , and also the concept of local superconductivity manifested by doped manganites 94 .…”

Section: Hole Doping Of Parent Manganitementioning

confidence: 87%

Disproportionation and electronic phase separation in parent manganiteLaMnO3

Moskvin¹

2009

Phys. Rev. B

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Nominally pure undoped parent manganite LaMnO3 exhibits a puzzling behavior inconsistent with a simple picture of an A-type antiferromagnetic insulator (A-AFI) with a cooperative JahnTeller ordering. We do assign its anomalous properties to charge transfer instabilities and competition between insulating A-AFI phase and metallic-like dynamically disproportionated phase formally separated by a first-order phase transition at T disp = TJT ≈ 750 K. The unconventional high-temperature phase is addressed to be a specific electron-hole Bose liquid (EHBL) rather than a simple "chemically" disproportionated R(Mn 2+ Mn 4+ )O3 phase. New phase does nucleate as a result of the charge transfer (CT) instability and evolves from the self-trapped CT excitons, or specific EH-dimers, which seem to be a precursor of both insulating and metallic-like ferromagnetic phases observed in manganites. We arrive at highly frustrated system of triplet (e 2 g ) 3 A2g bosons moving in a lattice formed by hole Mn 4+ centers. Starting with different experimental data we have reproduced a typical temperature dependence of the volume fraction of high-temperature mixedvalent EHBL phase. We argue that a slight nonisovalent substitution, photo-irradiation, external pressure or magnetic field gives rise to an electronic phase separation with a nucleation or an overgrowth of EH-droplets. Such a scenario provides a comprehensive explanation of numerous puzzling properties observed in parent and nonisovalently doped manganite LaMnO3 including an intriguing manifestation of superconducting fluctuations.

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Section: Hole Doping Of Parent Manganitementioning

confidence: 87%

Disproportionation and electronic phase separation in parent manganiteLaMnO3

Moskvin¹

2009

Phys. Rev. B

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“…Bari et al [17] found that a La 0:7 Ca 0:3 MnO 3 barrier com-VOLUME 93, NUMBER 15 P H Y S I C A L R E V I E W L E T T E R S pletely blocks supercurrent, even when it was very thinan order of magnitude thinner then in Refs. [6,7]. Barholz et al [18] observed no supercurrent in coplanar junctions with trenches down to 50 nm; they ascribed previous findings [4,5,10] to HTS microshorts formed by inadvertent resputtering of YBa 2 Cu 3 O 7 (YBCO).…”

mentioning

confidence: 97%

“…While in this Letter we have considered barriers up to 200 Å thick, the supercurrent was sizeable, and it is clear that the maximum coupling distance should be at least several times larger, even in our c-axis geometry-and conceivably longer in the more favorable a-axis geometry (as in Refs. [4][5][6][7][8][9][10][11]). …”

mentioning

confidence: 99%

Giant Proximity Effect in Cuprate Superconductors

Božović

Логвенов²,

Verhoeven³

et al. 2004

Phys. Rev. Lett.

167

163

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Using an advanced molecular beam epitaxy system, we have reproducibly synthesized atomically smooth films of high-temperature superconductors and uniform trilayer junctions with virtually perfect interfaces. We found that supercurrent runs through very thick barriers. We can rule out pinholes and microshorts; this "giant proximity effect" (GPE) is intrinsic. It defies the conventional explanation; it might originate in resonant tunneling through pair states in an almost-superconducting barrier. GPE may also be significant for superconducting electronics, since thick barriers are easier to fabricate.

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“…The study of HTSC and colossal magnetoresistance (CMR) multilayered materials has gained considerably a larger interest because of underlying new physics and various applications in spintronic devices. 1 A novel proximity effect of supercurrents that can tunnel through a barrier layer of thickness 500 nm in YBa 2 Cu 3 O y /La 0.7 Ca 0.3 MnO z /YBa 2 Cu 3 O y trilayered junctions was reported by Kasai et al 2 It is now established that the magnetic moments and magnetic order are extremely effective in destroying cooper pairs and consequently strongly depressing the superconductivity. The combination of YBa 2 Cu 3 O y as high-T C material and La 0.7 Ca 0.3 MnO z as magnetic materials is suitable for preparing laminated films, and these two materials can be grown epitaxially.…”

Section: Introductionmentioning

confidence: 94%

Effect of superconducting spacer layer thickness on magneto-transport and magnetic properties of La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 heterostructures

Sharma

Pandey

Sharma

et al. 2014

Journal of Applied Physics

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We have studied the magneto-transport and magnetic properties of LSMO/YBCO/LSMO trilayers on LaAlO3 (001) substrate, deposited using pulsed laser deposition technique. From x-ray diffraction measurements, it is confirmed that the grown trilayer films are single phase natured. The temperature dependent resistivity shows a metallic behavior below 350 K. At low temperature from resistivity fitted data, we observe that electron-electron, electron-phonon, and electron-magnon interactions are the main factors for scattering of carriers. The ferromagnetic LSMO layers suppress the critical temperature of YBCO spacer layer. We observe maximum magnetoresistance value ∼49% at 250 K for LSMO(200 nm)/YBCO(50 nm)/LSMO(200 nm) trilayer. Magnetization measurements reveal that at room temperature the YBCO spacer layer is allowing the LSMO layers to interact antiferromagnetically.

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Current-Voltage Characteristics of YBa₂Cu₃O_y/La_0.7Ca_0.3MnO_z/YBa₂Cu₃O_y Trilayered-Type Junctions

Cited by 98 publications

References 9 publications

Disproportionation and electronic phase separation in parent manganiteLaMnO3

Disproportionation and electronic phase separation in parent manganiteLaMnO3

Giant Proximity Effect in Cuprate Superconductors

Effect of superconducting spacer layer thickness on magneto-transport and magnetic properties of La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 heterostructures

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