Mössbauer effect of tin-119 doped in highT c Y−Ba−Cu−O superconductor

Chen, Y. L.; Li, B. R.; Chen, A.; Xu, Bin

doi:10.1007/bf02397155

Cited by 9 publications

(2 citation statements)

References 6 publications

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“…In YBa 2 Cu 3 O 7−x system, addition of tin up to a certain concentration yielded an increase in the critical temperature while substitution of Sn at the Cu site led to a decrease in T c . 16,17 Fig. 4.…”

Section: Resultsmentioning

confidence: 99%

Effects of Tin Addition to the Tl-Based 1223 Superconducting System

Wang

Hermann

1998

Mod. Phys. Lett. B

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Polycrystalline samples of Tl-based-1223 superconducting system were prepared with tin-addition to form (Tl 0.5 Pb 0.5 )SnxSr 1.6 Ca 2.4 Cu 3 Oy, for x = 0 -0.3. X-ray diffraction data showed the presence of a minor 1212 phase and impurities which increased with increasing x while the samples without addition of tin, x = 0, were nearly single phase of Tl,Pb-1223. The effects of tin addition to Tl,Pb-1223 on the magnetic properties were studied by dc susceptibility and hysteresis magnetization measurements. The magnetic results revealed a significant enlargement of hysteresis magnetization in tin-added samples with an onset transition temperature drop of only 1-4 K. According to recent measurements, the intragrain Jc reflects the transport critical current density in high field region. The critical current density in Tl,Pb-1223 was enhanced by as much as ten-times by tin-addition. An electron micro-probe technique was employed to locate the added tin in the samples, but Sn incorporated into the superconducting phase was below detectability. The variation in Tc with Sn addition and a reduction in pinning strength at Sn concentration above x = 0.05 show that the enhanced pinning is due to introduction of pinning centers into the superconducting phase even though micro-probe analysis indicates that most of the Sn is present in a nonsuperconducting phase. The field dependence and time dependence of the magnetization data showed an increased concentration of pinning centers without a change in pinning energy.

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Section: Resultsmentioning

confidence: 99%

Effects of Tin Addition to the Tl-Based 1223 Superconducting System

Wang

Hermann

1998

Mod. Phys. Lett. B

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“…5 The Sn cations were found to enter the lattice in this case. In Y(123) system, addition of tin upto a certain concentration yielded an increase in the critical temperature 6 and also found to result in the improvement of critical current density. 7 It was therefore of interest to probe the site geometry of the Sn cations in the (Tl 0.5 Pb 0.5 )Sn x Sr 1.6 a 2.4 Cu 3 O y system.…”

Section: Introductionmentioning

confidence: 94%

STUDY OF SITE GEOMETRY OF THE Sn CATIONS IN THE Sn-ADDED Tl-Pb(1223) SUPERCONDUCTING SYSTEM USING MÖSSBAUER AND AUGER EMISSION TECHNIQUES

Kumari

Singhal

Garg

et al. 1999

Int. J. Mod. Phys. B

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The addition of Sn in Tl,Pb(1223) (Tl 0.5 Pb 0.5 SnxSr 1.6 Ca 2.4 Cu 3 Oy) has been investigated using AES and Mössbauer Emission techniques to probe the valence and site geometry of Sn cations. It was found that Sn is present in tetravalent state in the compound at two sites with differing weights. The major part of the tin resides inside the grain and a minor part (weak doublet line in Mossbauer spectra) represents the contribution from the tin at the grain boundary.

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Bonding and Mössbauer Isomer Shifts in (Hg, Pb)‐1223 Cuprate

et al. 2003

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By using the chemical hood theory of dielectric description. the chemical bond parameters of (Hg, Pb)-l223 were calculated. The &ts show that the (&I , Sr)-O and (3-0 types of bond have higher ionic character, while the Cu-0 and (Hg, Pb)-O types of bond have more covalent charader. Mtkbawr isomer shiffs of nFe and %n do@ in (Hg, pb)-l223 were calculated by using the rhemical environmentsl fador, he, defined by covalency and electronicpolarizability. FourvalencestatetinandthRereleneeiron sites were identi6ed in nFe and luSn doped (Hg, Pb)-l223 superconductor. It can be collchded that all ofthe Fe atom substitute the Cu at square phmr Cu(1) site, whereas Sn prefers to substitute the square pymmidaI Cu(2) site.

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Mössbauer effect of tin-119 doped in highT c Y−Ba−Cu−O superconductor

Cited by 9 publications

References 6 publications

Effects of Tin Addition to the Tl-Based 1223 Superconducting System

Effects of Tin Addition to the Tl-Based 1223 Superconducting System

STUDY OF SITE GEOMETRY OF THE Sn CATIONS IN THE Sn-ADDED Tl-Pb(1223) SUPERCONDUCTING SYSTEM USING MÖSSBAUER AND AUGER EMISSION TECHNIQUES

Bonding and Mössbauer Isomer Shifts in (Hg, Pb)‐1223 Cuprate

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