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Title: Growth and structural characterization of large superconducting crystals of La 2 - x Ca 1 + x Cu 2 O 6

Abstract

Large crystals of La 2 - x Ca 1 + x Cu 2 O 6 (La-Ca-2126) with x = 0:10 and 0.15 have been grown and converted to bulk superconductors by high-pressure oxygen annealing. The superconducting transition temperature, T c, is as high as 55 K; this can be raised to 60 K by post-annealing in air. Here we present structural and magnetic characterizations of these crystals using neutron scattering and muon spin rotation techniques. While the as-grown, non-superconducting crystals are single phase, we nd that the superconducting crystals contain 3 phases forming coherent domains stacked along the c axis: the dominant La-Ca-2126 phase, very thin (1.5 unit-cell) intergrowths of La 2CuO 4, and an antiferromagnetic La 8Cu 8O 20 phase. We propose that the formation and segregation of the latter phases increases the Ca concentration of the La-Ca-2126, thus providing the hole-doping that supports superconductivity.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [4];  [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Columbia Univ., New York, NY (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412763
Alternate Identifier(s):
OSTI ID: 1411104; OSTI ID: 1468095
Report Number(s):
BNL-114738-2017-JA
Journal ID: ISSN 2475-9953; PRMHAR; R&D Project: PO010; KC0201060; TRN: US1800352
Grant/Contract Number:  
SC0012704; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 7; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Schneeloch, J. A., Guguchia, Z., Stone, Matthew B., Tian, Wei, Zhong, Ruidan, Mohanty, K. M., Xu, Guangyong, Gu, Genda D., and Tranquada, John M. Growth and structural characterization of large superconducting crystals of La2-xCa1+xCu2O6. United States: N. p., 2017. Web. doi:10.1103/PhysRevMaterials.1.074801.
Schneeloch, J. A., Guguchia, Z., Stone, Matthew B., Tian, Wei, Zhong, Ruidan, Mohanty, K. M., Xu, Guangyong, Gu, Genda D., & Tranquada, John M. Growth and structural characterization of large superconducting crystals of La2-xCa1+xCu2O6. United States. https://doi.org/10.1103/PhysRevMaterials.1.074801
Schneeloch, J. A., Guguchia, Z., Stone, Matthew B., Tian, Wei, Zhong, Ruidan, Mohanty, K. M., Xu, Guangyong, Gu, Genda D., and Tranquada, John M. Fri . "Growth and structural characterization of large superconducting crystals of La2-xCa1+xCu2O6". United States. https://doi.org/10.1103/PhysRevMaterials.1.074801. https://www.osti.gov/servlets/purl/1412763.
@article{osti_1412763,
title = {Growth and structural characterization of large superconducting crystals of La2-xCa1+xCu2O6},
author = {Schneeloch, J. A. and Guguchia, Z. and Stone, Matthew B. and Tian, Wei and Zhong, Ruidan and Mohanty, K. M. and Xu, Guangyong and Gu, Genda D. and Tranquada, John M.},
abstractNote = {Large crystals ofLa2-xCa1+xCu2O6 (La-Ca-2126) with x = 0:10 and 0.15 have been grown and converted to bulk superconductors by high-pressure oxygen annealing. The superconducting transition temperature, Tc, is as high as 55 K; this can be raised to 60 K by post-annealing in air. Here we present structural and magnetic characterizations of these crystals using neutron scattering and muon spin rotation techniques. While the as-grown, non-superconducting crystals are single phase, we nd that the superconducting crystals contain 3 phases forming coherent domains stacked along the c axis: the dominant La-Ca-2126 phase, very thin (1.5 unit-cell) intergrowths of La2CuO4, and an antiferromagnetic La8Cu8O20 phase. We propose that the formation and segregation of the latter phases increases the Ca concentration of the La-Ca-2126, thus providing the hole-doping that supports superconductivity.},
doi = {10.1103/PhysRevMaterials.1.074801},
url = {https://www.osti.gov/biblio/1412763}, journal = {Physical Review Materials},
issn = {2475-9953},
number = 7,
volume = 1,
place = {United States},
year = {2017},
month = {12}
}

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