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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

Journal Article · · Physical Review B
 [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)

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.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704; SC00112704
OSTI ID:
1425045
Alternate ID(s):
OSTI ID: 1409705
Report Number(s):
BNL-200053-2018-JAAM; PRBMDO; TRN: US1802011
Journal Information:
Physical Review B, Vol. 96, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (1)

Fluctuation diamagnetic susceptibility in type-II superconductors under magnetic field journal December 2019