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Title: Quasi-two-dimensional fluctuations in the magnetization of L a 1.9 C a 1.1 C u 2 O 6 + δ superconductors

Abstract

We report the results of magnetization measurements with the magnetic field applied along the c axis on superconducting La 1.9Ca 1.1Cu 2O 6+δ single crystals processed under ultrahigh oxygen pressure. Strong fluctuation effects were found in both low- and high-field regimes. Scaling analysis of the high-field magnetization data near the critical temperature (T c = 53.5K) region reveals the characteristics of critical fluctuation behavior of quasi-two-dimensional (2D) superconductivity, described by Ginzburg-Landau theory using the lowest Landau level approximation. Low-field magnetic susceptibility data can be successfully explained by the Lawrence-Doniach model for a quasi-2D superconductor, from which we obtained the a b plane Ginzburg-Landau coherence length of this system, ξ ab(0) = 11.8 ± 0.9 Å . The coherence length along the c axis, ξ c(0), is estimated to be about 1.65 Å, which is in between those of 2D cuprate systems, such as Bi 2Sr 2Ca 2Cu 3O 10 and Bi 2Sr 2CaCu 2O 8, and quasi-three-dimensional (3D) cuprate systems, such as overdoped La 2-xSr xCuO 4 and YBa 2Cu 3O 7-δ. Our studies suggest a strong interplay among the fluctuation effects, dimensionalities, and the ratios of the interlayer Cu-O plane spacing, s , to the c-axis coherence lengths. Amore » high s/ξ c(0) was observed in the high-pressure oxygenated La 1.9Ca 1.1Cu 2O 6+δ, and that apparently drives this system to behave more like a quasi-2D superconductor.« less

Authors:
 [1];  [2];  [3];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Inst. for Defense Analyses, Alexandria, VA (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Kwansei Gakuin Univ., Hyogo (Japan)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1425045
Alternate Identifier(s):
OSTI ID: 1409705
Report Number(s):
BNL-200053-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1802011
Grant/Contract Number:  
SC0012704; SC00112704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Shi, Xiaoya, Dimitrov, I. K., Ozaki, Toshinori, Gu, Genda, and Li, Qiang. Quasi-two-dimensional fluctuations in the magnetization of La1.9Ca1.1Cu2O6+δ superconductors. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.184519.
Shi, Xiaoya, Dimitrov, I. K., Ozaki, Toshinori, Gu, Genda, & Li, Qiang. Quasi-two-dimensional fluctuations in the magnetization of La1.9Ca1.1Cu2O6+δ superconductors. United States. doi:10.1103/PhysRevB.96.184519.
Shi, Xiaoya, Dimitrov, I. K., Ozaki, Toshinori, Gu, Genda, and Li, Qiang. Wed . "Quasi-two-dimensional fluctuations in the magnetization of La1.9Ca1.1Cu2O6+δ superconductors". United States. doi:10.1103/PhysRevB.96.184519. https://www.osti.gov/servlets/purl/1425045.
@article{osti_1425045,
title = {Quasi-two-dimensional fluctuations in the magnetization of La1.9Ca1.1Cu2O6+δ superconductors},
author = {Shi, Xiaoya and Dimitrov, I. K. and Ozaki, Toshinori and Gu, Genda and Li, Qiang},
abstractNote = {We report the results of magnetization measurements with the magnetic field applied along the c axis on superconducting La1.9Ca1.1Cu2O6+δ single crystals processed under ultrahigh oxygen pressure. Strong fluctuation effects were found in both low- and high-field regimes. Scaling analysis of the high-field magnetization data near the critical temperature (Tc = 53.5K) region reveals the characteristics of critical fluctuation behavior of quasi-two-dimensional (2D) superconductivity, described by Ginzburg-Landau theory using the lowest Landau level approximation. Low-field magnetic susceptibility data can be successfully explained by the Lawrence-Doniach model for a quasi-2D superconductor, from which we obtained the a b plane Ginzburg-Landau coherence length of this system, ξab(0) = 11.8 ± 0.9 Å . The coherence length along the c axis, ξc(0), is estimated to be about 1.65 Å, which is in between those of 2D cuprate systems, such as Bi2Sr2Ca2Cu3O10 and Bi2Sr2CaCu2O8, and quasi-three-dimensional (3D) cuprate systems, such as overdoped La2-xSrxCuO4 and YBa2Cu3O7-δ. Our studies suggest a strong interplay among the fluctuation effects, dimensionalities, and the ratios of the interlayer Cu-O plane spacing, s , to the c-axis coherence lengths. A high s/ξc(0) was observed in the high-pressure oxygenated La1.9Ca1.1Cu2O6+δ, and that apparently drives this system to behave more like a quasi-2D superconductor.},
doi = {10.1103/PhysRevB.96.184519},
journal = {Physical Review B},
issn = {2469-9950},
number = 18,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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