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Title: Oxygen Isotope Effect in Bi$$_{2}$$Sr$$_{2}$$Ca$$_{n-1}$$Cu$$_{n}$$O$$_{2n+4+\delta}$$ ($n=1,2,3$) Single Crystals

Abstract

We report measurements of the oxygen isotope effect in Bi{sub 2}Sr{sub 2}Ca{sub n-1}Cu{sub n}O{sub 2n+4+{delta}} (n=1, 2,3) single crystals. For optimally doped materials the isotope exponent is found to decrease with increasing the number of CuO2 layers in a manner of inversely correlating with the superconducting transition temperature in this homologous family. This behavior is in contrast to the general belief that the isotope effect can be negligible for the optimally doped cuprates. Our results highlight the important role played by phonons and interlayer coupling in the high-temperature superconductivity.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
960014
Report Number(s):
BNL-83000-2009-JA
Journal ID: ISSN 0163-1829; PRBMDO; TRN: US1005871
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B: Condensed Matter and Materials Physics; Journal Volume: 76
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CUPRATES; DOPED MATERIALS; ISOTOPE EFFECTS; MONOCRYSTALS; OXYGEN ISOTOPES; PHONONS; SUPERCONDUCTIVITY; TRANSITION TEMPERATURE; national synchrotron light source

Citation Formats

Chen,X., Liang, B., Ulrich, C., Lin, C., Struzhkin, V., Wu, Z., Hemley, R., Mao, H., and Lin, H. Oxygen Isotope Effect in Bi$_{2}$Sr$_{2}$Ca$_{n-1}$Cu$_{n}$O$_{2n+4+\delta}$ ($n=1,2,3$) Single Crystals. United States: N. p., 2007. Web.
Chen,X., Liang, B., Ulrich, C., Lin, C., Struzhkin, V., Wu, Z., Hemley, R., Mao, H., & Lin, H. Oxygen Isotope Effect in Bi$_{2}$Sr$_{2}$Ca$_{n-1}$Cu$_{n}$O$_{2n+4+\delta}$ ($n=1,2,3$) Single Crystals. United States.
Chen,X., Liang, B., Ulrich, C., Lin, C., Struzhkin, V., Wu, Z., Hemley, R., Mao, H., and Lin, H. Mon . "Oxygen Isotope Effect in Bi$_{2}$Sr$_{2}$Ca$_{n-1}$Cu$_{n}$O$_{2n+4+\delta}$ ($n=1,2,3$) Single Crystals". United States. doi:.
@article{osti_960014,
title = {Oxygen Isotope Effect in Bi$_{2}$Sr$_{2}$Ca$_{n-1}$Cu$_{n}$O$_{2n+4+\delta}$ ($n=1,2,3$) Single Crystals},
author = {Chen,X. and Liang, B. and Ulrich, C. and Lin, C. and Struzhkin, V. and Wu, Z. and Hemley, R. and Mao, H. and Lin, H.},
abstractNote = {We report measurements of the oxygen isotope effect in Bi{sub 2}Sr{sub 2}Ca{sub n-1}Cu{sub n}O{sub 2n+4+{delta}} (n=1, 2,3) single crystals. For optimally doped materials the isotope exponent is found to decrease with increasing the number of CuO2 layers in a manner of inversely correlating with the superconducting transition temperature in this homologous family. This behavior is in contrast to the general belief that the isotope effect can be negligible for the optimally doped cuprates. Our results highlight the important role played by phonons and interlayer coupling in the high-temperature superconductivity.},
doi = {},
journal = {Physical Review B: Condensed Matter and Materials Physics},
number = ,
volume = 76,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • The anisotropic superconducting properties of aligned powders embedded in epoxy for bismuth copper oxides with the compositions (Bi{sub 1.6}Pb{sub 0.4})(Sr{sub 1.5}La{sub 0.5})CuO{sub 6+{delta}} ({ital n}=1, {ital T}{sub {ital c}}=32 K), Bi{sub 2}Ca{sub 1.2}Sr{sub 1.8}Cu{sub 2}O{sub 8+{delta}} ({ital n}=2, {ital T}{sub {ital c}}=94 K), and (Bi{sub 1.85}Pb{sub 0.15})Ca{sub 2.2}Sr{sub 1.8}Cu{sub 3}O{sub 10+{delta}} ({ital n}=3, {ital T}{sub {ital c}}=110 K) are reported. These {ital c}-axis-aligned samples were prepared in a 9.4-T applied magnetic field at room temperature. The temperature dependence of the anisotropy ratio {chi}{sub {ital c}}({ital T})/{chi}{sub {ital a}{ital b}}({ital T}) in the superconducting state is derived from both zero-field-cooled andmore » field-cooled data using a small applied field {ital H} (less than or equal to the lower critical field {ital H}{sub {ital c}1}) parallel and perpendicular to the orthorhombic {ital c} axis. A highly anisotropic {chi}{sub {ital c}}/{chi}{sub {ital a}{ital b}} ratio was observed for all three systems, the maximum value of {chi}{sub {ital c}}/{chi}{sub {ital a}{ital b}}=9.8 at 5 K and 10.8 at 85 K for the 2:2:2:3 compound (Bi{sub 1.85}Pb{sub 0.15})Ca{sub 2.2}Sr{sub 1.8}Cu{sub 3}O{sub 10+{delta}} was observed. The field dependence of the anisotropy ratio {chi}{sub {ital c}}({ital H})/{chi}{sub {ital a}{ital b}}({ital H}) for the 2:1:2:2 compound Bi{sub 2}Ca{sub 1.2}Sr{sub 1.8}Cu{sub 2}O{sub 8+{delta}} up to 5 kG is discussed.« less
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  • 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
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