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Singh, Rajvir; Lal, R. B.; Upreti, U. C.; Suri, Dhavala; Narlikar, A. V.; Awana, V. P. S.; Aguiar, J. Albino; Shahabuddin, Md.

doi:10.1103/physrevb.55.1216

Cited by 34 publications

(21 citation statements)

References 35 publications

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“…In contrast to this, with Sr substitution the second transition shifts towards the higher temperatures and is over lapped with first transition. This results in a sharp single transition with negative slope at the onset part, indicating a strong coupling component [11][12][13][14][15][16]. However with further increase of dopant level (x > 0.10) two step transition is again appeared, indicating weakening of grain coupling.…”

Section: Resultsmentioning

confidence: 99%

Magnetization and magneto-resistance in Y(Ba_1−xSr_x)₂Cu₃O_7−δ(x= 0.00–0.50) superconductors

Liyanawaduge

Singh

Kumar

et al. 2012

Supercond. Sci. Technol.

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Here we present the magnetic properties and upper critical field (B C2 ) of polycrystalline Y(Ba 1-x Sr x ) 2 Cu 3 O 7- superconductors, which are being determined through detailed ac/dc susceptibility and resistivity under magnetic field (RTH) study. All the samples are synthesized through solid state reaction route. Reduction in Meissner fraction (the ratio of field cooled to zero field cooled magnetization) is observed with increasing Sr content, suggesting occurrence of flux pining in the doped samples. The ac susceptibility and resistivity measurements reveal improved grain couplings in Sr substituted samples. Consequently the inter-grain critical current density (J c ), upturn curvature near the T c in temperature dependence of upper critical field [B C2 (T)], and B C2 are enhanced. Both J c and B C2 increase in lower Sr substitution (up to x = 0.10) samples followed by decrease in higher doping due to degradation in effective pining and grain coupling. PACS: 74.25.Wx, 74.25.fc, 74.25.Sv, 74.25.Op

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Section: Resultsmentioning

confidence: 99%

Magnetization and magneto-resistance in Y(Ba_1−xSr_x)₂Cu₃O_7−δ(x= 0.00–0.50) superconductors

Liyanawaduge

Singh

Kumar

et al. 2012

Supercond. Sci. Technol.

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“…The crystalline structure of La1113 is tetragonal (P4/mmm) and its critical temperature (T C ) is around 80 K. The literature reports indicate that this superconductor does not show significant structural variations after single atom substitution [3][4][5]. However, La1113 becomes orthorhombic (Pmmm) when polyhedrons of oxyanions are located in the Cu(1) site [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Aging effect in CaLaBa{Cu1 − xFex}3O7 − δ with 0 ≤ x ≤ 0.07 studied by Mössbauer spectroscopy

et al. 2011

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In this work, we study the long-term aging effect caused by Fe atoms in the superconductor CaLaBa{Cu 1−x Fe x } 3 O 7−δ with 0 ≤ x ≤ 0.07. XRD confirms that this system has a YBCO-like structure. The critical temperature (T c ) is strongly affected by aging and depends on the amount of Fe in the structure. Room temperature Mössbauer spectroscopy reveals the presence of the typical species A, B-B , C and new species E and F. Interestingly; A, which corresponds to the Fe 3+ atom located in the Cu(1) of the chains with spin S z = 3/2, shows a drastic reduction which means migration to the species B, B and C. Species B and B correspond to the Fe 3+ in the Cu(2) site forming planar quasi-octahedral and planar square pyramidal, while the C specie is a square pyramidal with O(5) respectively (spin S z = 3/2 in all these cases). Aging causes loss of superconductivity in the samples with 5 and 7% of iron content.

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“…Temperature dependence of resistivity and AC susceptibility The room temperature resistivity is of the same order of magnitude of that obtained by other researches [6][7][8] and is significantly larger than in YBCO. The transition temperature T c was defined as a temperature at which dq/dT shows the maximum value.…”

Section: Results and Considerationsmentioning

confidence: 62%

Characterization of polycrystalline LaBaCaCu3O7−δ superconductors in the fluctuation regime

Minowa

Yamada

Môri

2008

Physica C: Superconductivity

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Superconductivity in Zn-doped tetragonalLaBaCaCu3O7−

Cited by 34 publications

References 35 publications

Magnetization and magneto-resistance in Y(Ba_1−xSr_x)₂Cu₃O_7−δ(x= 0.00–0.50) superconductors

Magnetization and magneto-resistance in Y(Ba_1−xSr_x)₂Cu₃O_7−δ(x= 0.00–0.50) superconductors

Aging effect in CaLaBa{Cu1 − xFex}3O7 − δ with 0 ≤ x ≤ 0.07 studied by Mössbauer spectroscopy

Characterization of polycrystalline LaBaCaCu3O7−δ superconductors in the fluctuation regime

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Superconductivity in Zn-doped tetragonalLaBaCaCu3O7−

Cited by 34 publications

References 35 publications

Magnetization and magneto-resistance in Y(Ba1−xSrx)2Cu3O7−δ(x= 0.00–0.50) superconductors

Magnetization and magneto-resistance in Y(Ba1−xSrx)2Cu3O7−δ(x= 0.00–0.50) superconductors

Aging effect in CaLaBa{Cu1 − xFex}3O7 − δ with 0 ≤ x ≤ 0.07 studied by Mössbauer spectroscopy

Characterization of polycrystalline LaBaCaCu3O7−δ superconductors in the fluctuation regime

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Magnetization and magneto-resistance in Y(Ba_1−xSr_x)₂Cu₃O_7−δ(x= 0.00–0.50) superconductors

Magnetization and magneto-resistance in Y(Ba_1−xSr_x)₂Cu₃O_7−δ(x= 0.00–0.50) superconductors