Journal ArticleDOI
Neutron diffraction study of Pr valence and oxygen ordering in the Y1−xPrxBa2Cu3O7−δ system
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The crystallographic changes that occur with increasing Pr concentration in the Y−xPrxBa2Cu3O7−δ system have been studied by neutron diffraction as discussed by the authors.Abstract:
The crystallographic changes that occur with increasing Pr concentration in the Y−xPrxBa2Cu3O7−δ system have been studied by neutron diffraction. As x is increased from 0 to 1, the orthorhombic a, b and c lattice parameters expand monotonically, while the orthorhombic distortion, espressed as b a , decreases, reflecting increased occupation of O(5) sites at the expense of O(4) chain site occupancy. The separation of the CuO2 planes in PrBa2Cu3O7−δ indicates that the Pr ions have an intermediate valence of ∼3.3 in this compound. Evidence is presented for increased interaction between the Pr ions and oxygen ions in adjacent CuO2 planes.read more
Citations
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A review of the superconducting and normal state properties of Y1−xPrxBa2Cu3O7
TL;DR: The properties of the Y1−xPrxBa2Cu3O7 (YPrBCO) system are reviewed in this paper, including superconducting, normal state, structural, chemical, optical, magnetic, and thermal properties.
Journal ArticleDOI
Charge density studies utilizing powder diffraction and MEM. Exploring of high Tc superconductors, C60 superconductors and manganites
TL;DR: The recent progress of the accurate charge density studies by the Maximum Entropy Method (MEM) utilizing X-ray powder diffraction is reviewed with some examples in this paper, where results for PrBCO (PrBa 2 Cu 3 O 7-δ ), YBCO(YBa 2 CsC 60, K 2 RbC 60, Na 2 R bC 60 and Na 2 rbC60 ) and the layered manganite, NdSr 2 Mn 2 O 7, which is well known as colossal magnetoresistive (C
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A systematic low-temperature neutron diffraction study of the RBa2Cu3Ox (R=yttrium and rare earths; x=6 and 7) compounds
M. Guillaume,P. Allenspach,W. Henggeler,Joël Mesot,B. Roessli,Urs Staub,Peter M. Fischer,Albert Furrer,V. Trounov +8 more
TL;DR: In this paper, the crystal structures of RBa2Cu3Ox (R=Y and rare earths; x=6 and 7) ceramic materials were investigated at 10 K by neutron diffraction and consistently analyzed concerning systematic trends.
Journal ArticleDOI
The question of Pr in HTSC
TL;DR: In this paper, the authors reviewed the physical properties and the several theories which have been proposed to describe the anomalous behavior of rare earth elements in the normal and superconducting states.
Journal ArticleDOI
Crystal chemical substitutions and doping of YBa2CU3Ox and related superconductors
TL;DR: A review of the literature on substitutions and their effect on the properties of the 90 K superconductor YBa 2 Cu 3 O δ (YBCO) can be found in this paper.
References
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Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
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Broader perspective on the high-temperature superconduct- ing YBa2Cu3Oy system: The real role of the oxygen content.
TL;DR: These data are interpreted to demonstrate that the (Cu-O) charge in the sheets largely determines T/sub c/ and that the varying oxygen content and the chains merely provide an insulating reservoir of charge.
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Incorporation of Pr in YBa2Cu3O7−δ: electronic effects on superconductivity
Lynda Soderholm,K. Zhang,D. G. Hinks,M. A. Beno,James D. Jorgensen,Carlo U. Segre,Ivan K. Schuller +6 more
TL;DR: In this paper, the authors present the results of a study of the structure and transport properties of the series of compounds Y1−xPrxBa2Cu3O7−δ (x = 0−1.0), in which they observe a monotonic decrease in Tc and eventually a metal-nsulator transition with increasing Pr concentration.
Journal ArticleDOI
Magnetic ordering and superconductivity in Y1-xPrxBa2Cu3O7-y.
Abebe Kebede,Chan-Soo Jee,J. Schwegler,J. E. Crow,T. Mihalisin,G.H. Myer,R. E. Salomon,Pedro Schlottmann,M.V. Kuric,S. H. Bloom,Robert P. Guertin +10 more
TL;DR: The specific heat, the susceptibility, the magnetic ordering, and the metal-to-semiconductor transition seen in the resistivity are consistent with the picture that Y{sup 3+} is replaced by Pr{sup 4+} with some degree of valence admixture of the Pr-Ba-Cu-O configuration.
Journal ArticleDOI
Hole filling and pair breaking by Pr ions in YBa2Cu3O6.95+/-0.02.
TL;DR: In this article, the superconducting critical temperature of the (Y{sub 1{minus}ital x}{minus}{ital y}} Ca{sub {ital y}) and Ba{sub 2}Cu{sub 3}O{sub 7{minus{delta}} system as a function of {ital x} and ǫ is investigated.