1989
DOI: 10.1103/physrevb.39.6612 View full text |Buy / Rent full text
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Abstract: The T, of Bi2CaSr2Cu208can be shifted reversibly over a range of at least 15 K by changing the oxygen concentration.

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“…These effects have been investigated for example by Cava et al in case of YBCO HTS (high temperature superconductors), [54,55] by Presland and Tallon et al in case of bismuth-containing oxide based HTS, [46,[56][57][58] and by Morris, Groen and Zhao et al for the Tl analogues. [59][60][61] For mercury-containing compounds like Hg-1223, Hg-1201, and Hg-1212 for instance Morosin et al, [62] Fukuoka et al, [63] and Guillen-Vialett et al [64] could show the dependence of T c from annealing temperature and oxygen pressure. Besides influencing T c , oxygen treatment is considered to improve the stability of thin HTS layers [65] as well as rendering the critical current density.…”
Section: Introductionmentioning
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“…These effects have been investigated for example by Cava et al in case of YBCO HTS (high temperature superconductors), [54,55] by Presland and Tallon et al in case of bismuth-containing oxide based HTS, [46,[56][57][58] and by Morris, Groen and Zhao et al for the Tl analogues. [59][60][61] For mercury-containing compounds like Hg-1223, Hg-1201, and Hg-1212 for instance Morosin et al, [62] Fukuoka et al, [63] and Guillen-Vialett et al [64] could show the dependence of T c from annealing temperature and oxygen pressure. Besides influencing T c , oxygen treatment is considered to improve the stability of thin HTS layers [65] as well as rendering the critical current density.…”
Section: Introductionmentioning
“…Many studies showed that annealing of cuprate based samples in oxygen can be used to increase the temperature at which the transition from normal conductivity to superconductivity takes place. These effects have been investigated for example by Cava et al in case of YBCO HTS (high temperature superconductors),54,55 by Presland and Tallon et al in case of bismuth‐containing oxide based HTS,46,5658 and by Morris , Groen and Zhao et al for the Tl analogues 5961. For mercury‐containing compounds like Hg‐1223, Hg‐1201, and Hg‐1212 for instance Morosin et al,62 Fukuoka et al,63 and Guillen‐Vialett et al64 could show the dependence of T c from annealing temperature and oxygen pressure.…”
Section: Introductionmentioning
“…Different methods have been employed in preparing overdoped Bi2212 samples. The most common way is to insert extra oxygen in Bi 2 Sr 2 CaCu 2 O 8+δ by high oxygen annealing 31,32 . In this case, high oxygen pressure of up to ∼30 MPa is used to achieve overdoped Bi2212 with a T c of ∼65 K 32 .…”
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“…After establishing a reproducible method to get high quality overdoped Bi2212 samples, we moved on to obtain Bi2212 samples with different T c s by tuning the oxygen pressure that is known to be a sensitive knob in dictating T c 7,31,40 . Fig.…”
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“…Recently, there has been a weight of evidence that the valence states of Bi and Tl are less than 3+ [10][11][12][13] and can undergo variation, which has also been theoretically substantiated [14][15][16]. As a consequence of the simultaneous presence of two mixed valence cations, viz., Tl and Cu (or Bi and Cu), the task of estimating the copper valence, and hence the hole concentration, in both Tl-and Bi-based cuprates is seemingly an unsolved problem through the iodometric technique and, thus, the results yielded by the latter are not free from ambiguity.…”
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