Crystal growth of the new Sr2RuO4–Sr3Ru2O7 eutectic system by a floating-zone method

Fittipaldi, R.; Vecchione, A.; Fusanobori, S.; Takizawa, K.; Yaguchi, Hiroshi; Hooper, Joseph P.; Perry, Robin; Maeno, Y.

doi:10.1016/j.jcrysgro.2005.04.104

Cited by 35 publications

(40 citation statements)

References 22 publications

(32 reference statements)

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“…The rod and seed crystal were www.crt-journal.org rotated oppositely to each other at 30 rpm. An inspection of the surface of several samples under a differential interference contrast microscope in polarized light showed that the crystal morphology was mainly constituted by ordered lamellar pattern or isolated islands of one phase embedded in the other [8,9,11]. X-ray diffraction spectra of sample A and sample B with different ratio of the two phases are shown in figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…Two types of single crystals (Sr 2 RuO 4 ) 1-x /(Sr 3 Ru 2 O 7 ) x with x up to 1 (sample A) and (Sr 4 Ru 3 O 10 ) 1-y /(Sr 3 Ru 2 O 7 ) y with y up to 0.5 (samples B) were grown by a floating-zone method in an infrared image furnace (NEC Machinery, model SC-MDH11020) in Salerno, using procedures described in detail elsewhere [8,9]. All the crystals used in this study were characterized by X-ray diffraction using a Bruker D8 automatic diffractometer operating with nickel filtered CuKα radiation (λ = 1.5406 Å) source used at 40 kV and 40 mA.…”

Section: Methodsmentioning

confidence: 99%

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Floating zone growth of eutectic Sr_n+1Ru_nO_3n+1 crystals

Fittipaldi¹,

Granata²,

Vecchione³

2011

Cryst. Res. Technol.

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A novel route to engineer Sr 2 RuO 4 /Sr 3 Ru 2 O 7 and Sr 3 Ru 2 O 7 /Sr 4 Ru 3 O 10 natural junctions has been successfully pursued by eutectic solidification in a double-mirror optical floating zone furnace in the flux feeding floating zone configuration with Ru self-flux. The synthesis procedure of the polycrystalline rod is found to be a critical factor for the crystal growth. Both eutectic systems grow in the [100] direction and cleave in the a-b plane as the single phase crystals. Extensive XRD and SEM studies show that the nature of the eutectic solidification enables the displacement of the two phases in an ordered lamellar pattern piling up along the crystallographic c-axis.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Floating zone growth of eutectic Sr_n+1Ru_nO_3n+1 crystals

Fittipaldi¹,

Granata²,

Vecchione³

2011

Cryst. Res. Technol.

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“…The peculiar sensitivity of the screening to small applied fields has been considered as an evidence of an intrinsic granularity. So far, the nature of the SC state in the eutectic turns out to be controversial, mainly for the lack of detailed structural characterization about the concentration and the size of Sr [6]. Inspection with the polarized light optical microscope (PLOM) within the a-c planes confirmed the expected lamellar solidification microstructure of the eutectic Sr 2 RuO 4 -Sr 3 Ru 2 O 7 [6].…”

mentioning

confidence: 99%

“…The recent progress [6] in preparing samples with eutectic solidification of superconducting(SC) Sr 2 RuO 4 and metamagnetic Sr 3 Ru 2 O 7 have opened a novel route to explore systems where unconventional superconductivity and collective magnetic behavior can be matched at the nanoscale with high interface quality. A preliminary characterization of this type of compound, via currentvoltage (I-V ) measurements, has shown an unusual temperature and field behavior of the critical current [7].…”

mentioning

confidence: 99%

“…So far, the nature of the SC state in the eutectic turns out to be controversial, mainly for the lack of detailed structural characterization about the concentration and the size of Sr [6]. Inspection with the polarized light optical microscope (PLOM) within the a-c planes confirmed the expected lamellar solidification microstructure of the eutectic Sr 2 RuO 4 -Sr 3 Ru 2 O 7 [6]. The morphology of the crystals has been investigated by scanning electron microscope (SEM) equipped with electron back scattered (EBS) detector, yielding no detectable precipitates.…”

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confidence: 99%

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Superconductivity in Sr ₂ RuO ₄ -Sr ₃ Ru ₂ O ₇ eutectic crystals

Fittipaldi¹,

Vecchione²,

Ciancio³

et al. 2008

Europhys. Lett.

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Superconducting behavior has been observed in the Sr2RuO4-Sr3Ru2O7 eutectic system as grown by the flux-feeding floating zone technique. A supercurrent flows across a single interface between Sr2RuO4 and Sr3Ru2O7 areas at distances that are far beyond those expected in a conventional proximity scenario. The current-voltage characteristics within the Sr3Ru2O7 macrodomain, as extracted from the eutectic, exhibit signatures of superconductivity in the bilayered ruthenate. Detailed microstructural, morphological and compositional analyses address issues on the concentration and the size of Sr2RuO4 inclusions within the Sr3Ru2O7 matrix. We speculate on the possibility of inhomogeneous superconductivity in the eutectic Sr3Ru2O7 and exotic pairing induced by the Sr2RuO4 inclusions.

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