Suppression of the superconducting critical current of Nb in bilayers of Nb∕SrRuO3

Feigenson, Michael; Klein, Lior; Karpovski, M.; Reiner, J. W.; Beasley, M. R.

doi:10.1063/1.1855701

Cited by 13 publications

(12 citation statements)

References 11 publications

(18 reference statements)

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“…However, the parameters that define the convergence threshold on total energy and truncation criteria for bielectronic integrals were tightened to (8) and (8 8 8 8 16), respectively.…”

Section: Computational Detailsmentioning

confidence: 99%

“…In recent years, SrRuO 3 has become the most popular epitaxial electrode for complex oxide heterostructures and has been utilized in ferroelectrics, Schottky junctions, magnetocalorics, and magnetoelectrics [2][3][4][5]. Moreover, it has attracted the attention of superconductor and spintronics communities [6][7][8]. Reflecting this broad interest, more than 1000 papers involving the physics, materials science, and applications of SrRuO 3 have been published over the last two decades [1].…”

Section: Introductionmentioning

confidence: 99%

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On the crystalline structure of orthorhombic SrRuO3: A benchmark study of DFT functionals

Masys

Jonauskas

2016

Computational Materials Science

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By investigating the crystalline structure of ground-state orthorhombic SrRuO 3 , we present a benchmark study of some of the most popular density functional theory (DFT) approaches from the local density approximation (LDA), generalized-gradient approximation (GGA), and hybrid functional families. Recent experimental success in stabilizing tetragonal and monoclinic phases of SrRuO 3 at room temperature sheds a new light on the ability to accurately describe geometry of this material by applying first-principles calculations. Therefore, our work is aimed to analyse the performance of different DFT functionals and provide some recommendations for future research of SrRuO 3 . A comparison of the obtained results to the low-temperature experimental data indicates that revised GGAs for solids are the best choice for the lattice constants and volume due to their nice accuracy and low computational cost. However, when tilting and rotation angles appear on the scene, a combination of the revised GGAs with the hybrid scheme becomes the most preferable option. It is important to note that a worse performance of LDA functional is somewhat compensated by its realistic reproduction of electronic and magnetic structure of SrRuO 3 , making it a strong competitor if the physical features are also taken into account.

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“…However, the parameters that define the convergence threshold on total energy and truncation criteria for bielectronic integrals were tightened to (8) and (8 8 8 8 16), respectively.…”

Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the crystalline structure of orthorhombic SrRuO3: A benchmark study of DFT functionals

Masys

Jonauskas

2016

Computational Materials Science

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“…Similarly, a 1.6 times decrease of J c at 4.7 K in the case of stripe domains in a Nb/ Cu/ SrRuO 3 hybrid was found when compared to uniformly polarized FM SrRuO 3 . 31 The suppression of J c was linked to the stray fields of the magnetic domains. In a YBCO film covered with an in-plane anisotropic FM Pr 0.67 Sr 0.33 MnO 3 layer, 32 an ϳ1.5-fold enhancement of the critical current at T Ͼ 50 K, as compared to the pure YBCO film, was estimated from the hysteresis magnetization loops measured in perpendicular fields.…”

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confidence: 99%

Guiding superconducting vortices with magnetic domain walls

et al. 2008

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We demonstrate a unique prospect for inducing anisotropic vortex pinning and manipulating the directional motion of vortices by using the stripe domain patterns of a uniaxial magnetic film in the superconducting/ ferromagnetic hybrid. Our observations can be described by a model, which considers interactions between magnetic charges of vortices and surface magnetic charges of domains resulting in the enhanced pinning of vortices on domain walls. Superconducting/ferromagnetic ͑SC/FM͒ hybrids offer a variety of exciting new phenomena, which have been extensively discussed in recent years. 1-3 They are defined by short-range and long-range interactions between the competing SC and FM components responsible for the paramagnetic or proximity effects ͑due to FM exchange͒ and orbital coupling ͑due to magnetic stray field͒, respectively. In general, the phenomena of superconductivity and ferromagnetism are considered incompatible because singlet superconducting Cooper pairs carry opposite spins, while in the ferromagnets, all the spins are aligned. However, they can coexist in the bulk under a short-range proximity effect if they form fine scale inhomogeneous structures. Superconductivity could survive under conditions of a weak ferromagnetic exchange interaction by forming a spatially oscillating order parameter, the Fulde-Farrell-Larkin-Ovchinnikov ͑FFLO͒ structure. 4,5 In turn, the ferromagnetic component could form oppositely magnetized domains at length scales way below the SC penetration depth ͑cryptomagnetic structure 3,6-8 ͒, which would support "antiferromagnetic" Cooper pairs. Neither FFLO nor cryptomagnetic structures were convincingly confirmed so far for bulk materials. However, proximity phenomena such as the appearance of and intermediate phase Josephson junctions, have been experimentally demonstrated in FM/SC hybrids ͑see review 9 ͒. The short range of these effects is defined by the oscillating penetration of the SC pairs into the FM and is usually of the order of the coherence length. These scales are similar to the size of cryptomagnetic domains envisioned in bulk FM/SCs. 1 A special case of the proximity effect should appear in FM/SC bilayers due to the FM domain walls where the reduced effective exchange at the wall could lead to a locally enhanced superconducting transition temperature T c in the SC layer. 10 The long-range effects in FM/SC bilayers are associated with interactions of the FM stray fields with the SC screening currents. Due to such interactions, more robust superconductivity just above the FM domain walls is expected when domains are magnetized perpendicular to the SC/FM interface and the stray fields at the domain wall are at a minimum ͑see Ref. 11 and references therein͒. In contrast, domain walls between in-plane magnetized domains carry enhanced stray fields and should locally suppress the critical temperature. Similarly, the suppression of superconductivity above the domain walls is expected for magnetic layers with perpendicular anisotropy when the domain width exceeds the fil...

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“…As previously suggested, the magnetic domains in the F layer create pinning centers for the vortices in the S layer so that tuning the domain structure can result in tuning J c 4,5 . While the principle of magnetic pinning in the SFB's has been extensively discussed theoretically [2][3][4][5][6][7][8][9][10][11] and demonstrated experimentally [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] , the magnitude of the pinning enhancement thus far reported has been modest with a factor of no more than 3, and sometimes even suppression of pinning has been described 18 . Furthermore, it has not been feasible to compare various magnetic pinning results, since the different SFB bilayers used in these studies would render such comparison impractical.…”

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confidence: 99%

Enhancement of vortex pinning in superconductor/ferromagnet bilayers via angled demagnetization

et al. 2011

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We use local and global magnetometry measurements to study the influence of magnetic domain width w on the domain-induced vortex pinning in superconducting/ferromagnetic bilayers, built of a Nb film and a ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy, with an insulating layer to eliminate proximity effect. The quasi-periodic domain patterns with different and systematically adjustable width w, as acquired by a special demagnetization procedure, exert tunable vortex pinning on a superconducting layer. The largest enhancement of vortex pinning, by a factor of more than 10, occurs when w ≈ 0.31µm is close to the magnetic penetration depth.

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Suppression of the superconducting critical current of Nb in bilayers of Nb∕SrRuO3

Cited by 13 publications

References 11 publications

On the crystalline structure of orthorhombic SrRuO3: A benchmark study of DFT functionals

On the crystalline structure of orthorhombic SrRuO3: A benchmark study of DFT functionals

Guiding superconducting vortices with magnetic domain walls

Enhancement of vortex pinning in superconductor/ferromagnet bilayers via angled demagnetization

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