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Title: Superconductivity Induced by Oxygen Doping in Y 2 O 2 Bi

Authors:
 [1];  [2];  [3];  [1]
  1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter (FJIRSM), Chinese Academy of Sciences (CAS), Fuzhou 350002 China
  2. Department of Chemistry, North Carolina State University, Raleigh NC 27695-8204 USA
  3. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter (FJIRSM), Chinese Academy of Sciences (CAS), Fuzhou 350002 China, Department of Chemistry, North Carolina State University, Raleigh NC 27695-8204 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1401294
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 56; Journal Issue: 34; Related Information: CHORUS Timestamp: 2017-10-20 16:45:00; Journal ID: ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Cheng, Xiyue, Gordon, Elijah E., Whangbo, Myung-Hwan, and Deng, Shuiquan. Superconductivity Induced by Oxygen Doping in Y 2 O 2 Bi. Germany: N. p., 2017. Web. doi:10.1002/anie.201701427.
Cheng, Xiyue, Gordon, Elijah E., Whangbo, Myung-Hwan, & Deng, Shuiquan. Superconductivity Induced by Oxygen Doping in Y 2 O 2 Bi. Germany. doi:10.1002/anie.201701427.
Cheng, Xiyue, Gordon, Elijah E., Whangbo, Myung-Hwan, and Deng, Shuiquan. Mon . "Superconductivity Induced by Oxygen Doping in Y 2 O 2 Bi". Germany. doi:10.1002/anie.201701427.
@article{osti_1401294,
title = {Superconductivity Induced by Oxygen Doping in Y 2 O 2 Bi},
author = {Cheng, Xiyue and Gordon, Elijah E. and Whangbo, Myung-Hwan and Deng, Shuiquan},
abstractNote = {},
doi = {10.1002/anie.201701427},
journal = {Angewandte Chemie (International Edition)},
number = 34,
volume = 56,
place = {Germany},
year = {Mon Apr 03 00:00:00 EDT 2017},
month = {Mon Apr 03 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1002/anie.201701427

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  • The phonon Raman spectra of Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital x}}Y{sub {ital x}}Cu{sub 2}O{sub 8+{ital d}} ({ital x}=0{minus}1) have been investigated in a number of well-defined single-crystal and polycrystalline samples. From the polarization and Y-doping dependence, and from a comparison with previous reports on Bi-based cuprates, we identify the (6{ital A}{sub 1{ital g}}+1{ital B}{sub 1{ital g}}) symmetry modes that are Raman allowed within the ideal body-centered-tetragonal unit cell. A large number of extra {open_quote}{open_quote}{ital disorder}-{ital induced}{close_quote}{close_quote} phonon bands are observed in the {ital ab}-plane polarized spectra. In contrast to most previous reports, we argue that the {ital c}-axis polarized phonon bandmore » around 629 cm{sup {minus}1} is due to the O(2){sub Sr} {ital A}{sub 1{ital g}} vibration, while the exclusively {ital ab}-plane polarized band around 463 cm{sup {minus}1} is induced by the O(3){sub Bi} {ital A}{sub 1{ital g}} vibration. With increasing Y doping we find that the vibrational modes involving atoms in the CuO{sub 2} planes rapidly increase in intensity as a result of the reduced metallic screening in the hole-depleted Y-doped samples. We also find that Y substitution gives rise to a substantial hardening of the O(1){sub Cu} {ital A}{sub 1{ital g}} and {ital B}{sub 1{ital g}} phonons by {approximately}40 cm{sup {minus}1}, whereas the O(2){sub Sr} {ital A}{sub 1{ital g}} phonon is found to soften by {approximately}20 cm{sup {minus}1}, when {ital x} increases from 0 to 1. The phonon frequency changes can be explained by the {open_quote}{open_quote}{ital internal} {ital pressure}{close_quote}{close_quote} induced by the decrease in the average Ca/Y ion size and an additional {open_quote}{open_quote}{ital charge}-{ital transfer}{close_quote}{close_quote} induced by the change in the Cu and Bi valences with Y doping. {copyright} {ital 1996 The American Physical Society.}« less
  • Comparative neutron structural investigations are made on nonsuperconducting (slow-cooled) and superconducting (liquid-nitrogen quenched; T{sub c}{sup onset} = 70 K and R = 0 at 20 K) samples of (Bi{sub 0.5}Cu{sub 0.5})Sr{sub 2}(Y{sub 0.8}Cu{sub 0.2})Cu{sub 2}O{sub 7+{delta}} in order to examine the role of excess oxygen on the superconducting behavior of this {open_quotes}1212{close_quotes}-phase compound. Analysis of refined structural parameters shows that the two main factors which influence the superconductivity in (Bi, Cu)-1212 are: (i) the extent of occupancy of excess oxygen at O(5), the 2(e) site located in between the two CuO{sub 2} pyramidal layers, and (ii) the length of themore » apical Cu(2)-O(2) bond. The (Bi, Cu)-O monolayer plays the role of the {open_quotes}charge reservoir{close_quotes} quite effectively as reflected by the substantial increase in the length of the apical (bridging) Cu(2)-O(2) bond due to depletion of excess oxygen in this layer. Surprisingly, vacancies at as many as 10% of the O(1) site belonging to the CuO{sub 2} planes do not appear to disrupt the flow of current in the Cu(3d)-O(2p) planar network in the superconducting state. Relevant features of the structure of the (Bi,Cu)-1212 phase, in particular the role of excess oxygen and its occupancy at different sites, are discussed in the light of the available data on the isostructural (Pb,Cu)-1212 phase and the (La,Sr,Ca){sub 3}-Cu{sub 2}O{sub 6+{delta}} phase superconductors.« less
  • The properties of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital y}} annealed at 200--650 {degree}C in vacuum (10{sup {minus}4}Pa) are studied by x-ray powder diffraction, ac magnetization, and Hall measurement. The amount of oxygen loss, {Delta}{ital y}, was obtained by an integration of the oxygen partial pressure measured by a quadrupole mass spectrometer. The {ital T}{sub {ital c}} increases from 65 to 92 K, which is accompanied by a small amount of oxygen loss (on the order of 10{sup {minus}3}). The {ital a} and {ital c} axes are extended by the oxygen loss. The change of the hole concentration estimated by Hallmore » measurement is of the same order of magnitude as that for the other superconducting oxides against the change of {ital T}{sub {ital c}}, however, it is larger by about two orders of magnitude than that expected from the oxygen loss. This discrepancy suggests charge redistribution in the structure.« less
  • Electron diffraction and high-resolution electron microscopy along the {ital c} axis have been used to examine the local structural variations in modulated Bi{sub 2}Sr{sub 2}Ca{sub 1{minus}{ital y}}Y{sub {ital y}}Cu{sub 2}O{sub 8+{delta}} and Bi{sub 10}Sr{sub 15}Fe{sub 10}O{sub 46} single crystals in the as-prepared, underdoped, and overdoped state. In both materials the structural disorder, of which the structural modulation is one aspect, results from the labile nature of the BiO planes. A structural model for the BiO layers which explains the structural modulation and describes all the structural defects observed is suggested. A drastic change in the nature of the modulation duemore » to an antiphase boundary structure appears in the highly substituted Y crystals in concomitance with the metal-insulator transition. The modified modulation contributes to the suppression of superconductivity by affecting the geometry of the CuO planes. {copyright} {ital 1996 The American Physical Society.}« less