Measurement of Magnetic Exchange in Ferromagnet-Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Ca</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>MnO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub

Giblin, Sean; Taylor, J. W.; Duffy, J. A.; Butchers, M. W.; Utfeld, C.; Dugdale, Stephen B; Nakamura, Tetsuya; Visani, C.; Santamarı́a, J.

doi:10.1103/physrevlett.109.137005

Cited by 16 publications

(13 citation statements)

References 27 publications

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“…It is thus a general property of to cuprate/manganite heterostructures and interfaces. The charge transfer modifies the superconducting doping only within 1-4 CuO 2 layers at the interface while, as shown by our calculations, the magnetisation profile in the cuprate layer is perturbed over at least 10-15 atomic layers, in agreement with the estimates made by Giblin et al 35 for YBCO/LCMO. The reduction of the critical temperature in our cuprate/manganite multilayers (more than 10 K, see Supplementary Materials) cannot be explained by the modest change of doping occurring in the first interfacial CuO 2 layers.…”

Section: Discussionsupporting

confidence: 80%

Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides

et al. 2014

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The so-called proximity effect is the manifestation, across an interface, of the systematic competition between magnetic order and superconductivity. This phenomenon has been well documented and understood for conventional superconductors coupled with metallic ferromagnets; however it is still less known for oxide materials, where much higher critical temperatures are offered by copper oxide-based superconductors. Here we show that, even in the absence of direct Cu-O-Mn covalent bonding, the interfacial CuO 2 planes of superconducting La 1.85 Sr 0.15 CuO 4 thin films develop weak ferromagnetism associated to the charge transfer of spin-polarised electrons from the La 0.66 Sr 0.33 MnO 3 ferromagnet. Theoretical modelling confirms that this effect is general to all cuprate/manganite heterostructures and the presence of direct bonding only affects the strength of the coupling. The DzyaloshinskiiMoriya interaction, also at the origin of the weak ferromagnetism of bulk cuprates, propagates the magnetisation from the interface CuO 2 planes into the superconductor, eventually depressing its critical temperature.

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Section: Discussionsupporting

confidence: 80%

Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides

et al. 2014

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“…It was reported that at 100 K, there was no Cu magnetic moment for a 25 u.c. YBCO layer in the LCMO/YBCO system 9 , where T SC was 80 K which is slightly higher than in our system.…”

Section: Resultscontrasting

confidence: 67%

“…On the one hand, the suppression of Mn magnetic moments at the interface was studied by polarized neutron reflectivity (PNR) 5 . On the other hand, X-ray linear dichroism (XLD), X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) studies indicated that an orbital reconstruction of the Cu atoms associated with a charge transfer across the interface and an anti-parallel coupling between the YBCO-LCMO interface are basically responsible for the proximity effect 6–9 . All these phenomena had been explained in terms of the covalent bonding of Cu and Mn atoms via the oxygen atom, which also rely on the specific interface termination 3 .…”

Section: Introductionmentioning

confidence: 99%

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Prajapat

Singh

Bhattacharya

et al. 2018

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A case study of electron tunneling or charge-transfer-driven orbital ordering in superconductor (SC)-ferromagnet (FM) interfaces has been conducted in heteroepitaxial YBa2Cu3O7(YBCO)/La0.67Sr0.33MnO3(LSMO) multilayers interleaved with and without an insulating SrTiO3(STO) layer between YBCO and LSMO. X-ray magnetic circular dichroism experiments revealed anti-parallel alignment of Mn magnetic moments and induced Cu magnetic moments in a YBCO/LSMO multilayer. As compared to an isolated LSMO layer, the YBCO/LSMO multilayer displayed a (50%) weaker Mn magnetic signal, which is related to the usual proximity effect. It was a surprise that a similar proximity effect was also observed in a YBCO/STO/LSMO multilayer, however, the Mn signal was reduced by 20%. This reduced magnetic moment of Mn was further verified by depth sensitive polarized neutron reflectivity. Electron energy loss spectroscopy experiment showed the evidence of Ti magnetic polarization at the interfaces of the YBCO/STO/LSMO multilayer. This crossover magnetization is due to a transfer of interface electrons that migrate from Ti(4+)−δ to Mn at the STO/LSMO interface and to Cu2+ at the STO/YBCO interface, with hybridization via O 2p orbitals. So charge-transfer driven orbital ordering is the mechanism responsible for the observed proximity effect and Mn-Cu anti-parallel coupling in YBCO/STO/LSMO. This work provides an effective pathway in understanding the aspect of long range proximity effect and consequent orbital degeneracy parameter in magnetic coupling.

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“…Although the induced ferromagnetic spin moments in the interfacial CuO 2 plane below the Curie temperature of LCMO layer have been previously reported 6 28 29 30 , our RSXS data suggests that they may have coupled ferromagnetically along c -axis throughout the YBCO layer as the diffraction peak width is limited by the layer thickness. This c -axis ferromagnetic spin coupling is established at 80 K, just above the ~70 K superconducting transition temperature of YBCO under study.…”

Section: Resultscontrasting

confidence: 47%

Selective interlayer ferromagnetic coupling between the Cu spins in YBa2Cu3O7−x grown on top of La0.7Ca0.3MnO3

Huang

Wray

Jeng

et al. 2015

Sci Rep

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Studies to date on ferromagnet/d-wave superconductor heterostructures focus mainly on the effects at or near the interfaces while the response of bulk properties to heterostructuring is overlooked. Here we use resonant soft x-ray scattering spectroscopy to reveal a novel c-axis ferromagnetic coupling between the in-plane Cu spins in YBa2Cu3O7−x (YBCO) superconductor when it is grown on top of ferromagnetic La0.7Ca0.3MnO3 (LCMO) manganite layer. This coupling, present in both normal and superconducting states of YBCO, is sensitive to the interfacial termination such that it is only observed in bilayers with MnO2 but not with La0.7Ca0.3O interfacial termination. Such contrasting behaviors, we propose, are due to distinct energetic of CuO chain and CuO2 plane at the La0.7Ca0.3O and MnO2 terminated interfaces respectively, therefore influencing the transfer of spin-polarized electrons from manganite to cuprate differently. Our findings suggest that the superconducting/ferromagnetic bilayers with proper interfacial engineering can be good candidates for searching the theorized Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state in cuprates and studying the competing quantum orders in highly correlated electron systems.

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Measurement of Magnetic Exchange in Ferromagnet-SuperconductorLa2/3Ca1/3MnO3/YBa2

Cited by 16 publications

References 27 publications

Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides

Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides

Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure

Selective interlayer ferromagnetic coupling between the Cu spins in YBa2Cu3O7−x grown on top of La0.7Ca0.3MnO3

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