Growth and structural characterization of large superconducting crystals of La2-xCa1+xCu2O6

Schneeloch, J. A.; Guguchia, Z.; Stone, Matthew B.; Tian, Wei; Zhong, Ruidan; Mohanty, K. M.; Xu, Guangyong; Gu, Genda D.; Tranquada, John M.

doi:10.1103/PhysRevMaterials.1.074801

Title: Growth and structural characterization of large superconducting crystals of ${La}_{2 - x} {Ca}_{1 + x} {Cu}_{2} O_{6}$

Journal Article · Fri Dec 01 00:00:00 EST 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.1.074801· OSTI ID:1412763

Schneeloch, J. A. ^[1]; Guguchia, Z. ^[2];

^[3];

^[3]; Zhong, Ruidan ^[4]; Mohanty, K. M. ^[1]; Xu, Guangyong ^[1]; Gu, Genda D. ^[1]; Tranquada, John M. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Columbia Univ., New York, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)

Large crystals of La2-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 postannealing in air. Here we present structural and magnetic characterizations of these crystals using neutron scattering and muon spin rotation techniques. While the as-grown, nonsuperconducting crystals are single phase, we find that the superconducting crystals contain three 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC05-00OR22725

OSTI ID:: 1412763

Alternate ID(s):: OSTI ID: 1411104; OSTI ID: 1468095

Report Number(s):: BNL-114738-2017-JA; PRMHAR; R&D Project: PO010; KC0201060; TRN: US1800352

Journal Information:: Physical Review Materials, Vol. 1, Issue 7; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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