Effects of composition and processing on the superconductivity of La1+zBa2-zCu3Oy

Lindemer, T.B.; Chakoumakos, Bryan C.; Specht, E. D.; Williams, R. K.; Chen, Y.J.

doi:10.1016/0921-4534(94)90144-9

Cited by 48 publications

(20 citation statements)

References 38 publications

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“…It is known that the chemistry of the La-Ba-Cu-O system is different from that of yttrium and most other lanthanide elements having a large number of ternary compound and solid solution series. 6,7 Sintering in inert atmosphere is necessary for the synthesis of good quality LaBa 2 Cu 3 O y . [8][9][10] Therefore, sintering of the mixed La 0.5 R 0.5 Ba 2 Cu 3 O y (La-R123) series has been performed in both inert helium and oxygen atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Phase separation and internal strains in the mixedLa0.5R0.5Ba2<

et al. 1998

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The mixed phase La 0.5 R 0.5 Ba 2 Cu 3 O y ͑where R is yttrium or another rare earth͒ has been prepared using a variation of the solid-state reaction technique. X-ray diffraction and Raman measurements have been carried out to study the effect of the mixed rare-earth substitution at the site of the Y atom. The x-ray-diffraction measurements show characteristic changes in the interatomic distances, which are indicative of strains in the unit cell. A strain-relaxation mechanism is proposed, attributed to the separation of phases. In the micro-Raman spectra, an increase of the A g mode frequency of the apex oxygen with increasing average La-R ionic radius is observed, the mode frequencies corresponding to the Ba and the Cu͑2͒ atoms remain practically unaffected, while in some compounds a new mode appears at ϳ126 cm Ϫ1 . The in-phase vibrations of the plane oxygen atoms show a shift to a lower frequency compared with the RBa 2 Cu 3 O y samples, similar to the one observed in the overdoped YBa 2 Cu 3 O y (yу6.92) system. Besides, the width of this phonon is considerably larger than in the YBa 2 Cu 3 O y compounds, attributable to the existence of phases with underdoped, optimally doped, and overdoped oxygen concentration. As concerns the changes induced in the B 1g Raman active mode of the out-of-phase vibrations of the plane oxygen atoms, they are indicative of phases rich in either La, R, or an intermediate phase. Differences observed from the Pr 1Ϫx R x Ba 2 Cu 3 O y compounds prove that the phase formation mechanism is not a pure ion-size effect.

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Section: Methodsmentioning

confidence: 99%

Phase separation and internal strains in the mixedLa0.5R0.5Ba2<

et al. 1998

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“…2 In this sense, magnetic ions on the Ba site have served as probes of the superconducting condensate, while the same ions on the L site have no known impact on the transition temperatures of the L 123 materials. It is also well known that substitution of nonmagnetic La 3+ on the Ba site of La123 slowly depresses the superconducting transition temperature of that material, [27][28][29][30][31] , while substitution of Nd 3+ on the Ba site of Nd123 has a dramatic effect. 32,33 What is new here is that the magnetic ions substituted on the Ba site also serve as a probe of the magnetic exchange on the Ba site.…”

Section: Discussionmentioning

confidence: 99%

Anomalous magnetic ordering inPrBa2Cu4O8and
Blackstead
¹
,
Smylie
²
,
Yelon
³

et al. 2008
Phys. Rev. B
1
0
0
0
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suggests that the failure of each to superconduct is related to the presence of Pr and Cm on their respective Ba sites. This defect is manifested, in each case, by short c-axis lattice parameters and anomalous high-temperature magnetic ordering which has been incorrectly attributed to ordering of the entire magnetic sublattice. Instead, it is shown that the anomalous high-temperature ordering as seen in the magnetization data is consistent with the ordering of magnetic ions substituted on the Ba site.

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“…Based on Table 4.2.1 [70,[93][94][95], the peritectic temperature of REBCO materials increase with increasing RE ionic radii. Since SmBCO and NdBCO have higher melting points than YBCO, and similar crystal structures as YBCO, their bulks and single crystals are commonly used as seed materials for YBCO bulk growth [96][97][98].…”

Section: Top-seeded Melt-growth and Progresses Of Seed Materials Searmentioning

confidence: 98%

Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

Chen

Cui

Yao

2015

Progress in Materials Science

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Effects of composition and processing on the superconductivity of La1+zBa2-zCu3Oy

Cited by 48 publications

References 38 publications

Phase separation and internal strains in the mixedLa0.5R0.5Ba2<

Phase separation and internal strains in the mixedLa0.5R0.5Ba2<

Anomalous magnetic ordering inPrBa2Cu4O8and
Blackstead
¹
,
Smylie
²
,
Yelon
³

et al. 2008
Phys. Rev. B
1
0
0
0
View full text Add to dashboard Cite

Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

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Effects of composition and processing on the superconductivity of La1+zBa2-zCu3Oy

Cited by 48 publications

References 38 publications

Phase separation and internal strains in the mixedLa0.5R0.5Ba2<

Phase separation and internal strains in the mixedLa0.5R0.5Ba2<

Anomalous magnetic ordering inPrBa2Cu4O8andBlackstead1, Smylie2, Yelon3 et al. 2008Phys. Rev. B1000View full textAdd to dashboardCite

Peritectic melting of thin films, superheating and applications in growth of REBCO superconductors

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Anomalous magnetic ordering inPrBa2Cu4O8and
Blackstead
¹
,
Smylie
²
,
Yelon
³

et al. 2008
Phys. Rev. B
1
0
0
0
View full text Add to dashboard Cite