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

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

doi:10.1103/PhysRevMaterials.1.074801

Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆

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

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2 Scopus citations

Abstract

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.

Original language	English
Article number	074801
Journal	Physical Review Materials
Volume	1
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevMaterials.1.074801
State	Published - Dec 4 2017

Funding

Work at Brookhaven was supported by the Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, US Department of Energy (DOE), through Contract No. DE-SC0012704. Z.G. gratefully acknowledges financial support by the Swiss National Science Foundation (Early Postdoc Mobility SNF fellowship P2ZHP2-161980), and sincerely thanks Hubertus Luetkens and Alex Amato for support on the experiments. R.Z. was supported by the Center for Emergent Superconductivity, an Energy Frontier Research Center funded by BES. The experiments at ORNL's SNS and HFIR were sponsored by the Scientific User Facilities Division, BES, US DOE.

Funders	Funder number
Hubertus Luetkens and Alex Amato
Office of Basic Energy Sciences
Scientific User Facilities Division
US Department of Energy
U.S. Department of Energy	DE-SC0012704
Basic Energy Sciences
Division of Materials Sciences and Engineering
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung	P2ZHP2-161980

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10.1103/PhysRevMaterials.1.074801

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Schneeloch, J. A., Guguchia, Z., Stone, M. B., Tian, W., Zhong, R., Mohanty, K. M., Xu, G., Gu, G. D., & Tranquada, J. M. (2017). Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆ Physical Review Materials, 1(7), Article 074801. https://doi.org/10.1103/PhysRevMaterials.1.074801

Schneeloch, J. A. ; Guguchia, Z. ; Stone, M. B. et al. / Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆ In: Physical Review Materials. 2017 ; Vol. 1, No. 7.

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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 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.",

author = "Schneeloch, {J. A.} and Z. Guguchia and Stone, {M. B.} and Wei Tian and Ruidan Zhong and Mohanty, {K. M.} and Guangyong Xu and Gu, {G. D.} and Tranquada, {J. M.}",

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Schneeloch, JA, Guguchia, Z, Stone, MB , Tian, W, Zhong, R, Mohanty, KM, Xu, G, Gu, GD & Tranquada, JM 2017, ' Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆ ', Physical Review Materials, vol. 1, no. 7, 074801. https://doi.org/10.1103/PhysRevMaterials.1.074801

Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆ . / Schneeloch, J. A.; Guguchia, Z.; Stone, M. B. et al.
In: Physical Review Materials, Vol. 1, No. 7, 074801, 04.12.2017.

Research output: Contribution to journal › Article › peer-review

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T1 - Growth and structural characterization of large superconducting crystals of La 2-x Ca 1+x Cu 2 O 6

AU - Schneeloch, J. A.

AU - Guguchia, Z.

AU - Stone, M. B.

AU - Tian, Wei

AU - Zhong, Ruidan

AU - Mohanty, K. M.

AU - Xu, Guangyong

AU - Gu, G. D.

AU - Tranquada, J. M.

PY - 2017/12/4

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N2 - 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.

AB - 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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Schneeloch JA, Guguchia Z, Stone MB , Tian W, Zhong R, Mohanty KM et al. Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆ Physical Review Materials. 2017 Dec 4;1(7):074801. doi: 10.1103/PhysRevMaterials.1.074801

Growth and structural characterization of large superconducting crystals of La _2-x Ca _1+x Cu ₂ O ₆

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