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High Pressure Crystal Growth and Properties of Hg-Based Superconductors and One-Dimensional A1−x;CuO2 (A = Sr, Ca, Ba) Cuprates

  • J. Karpiński
  • G. I. Meijer
  • H. Schwer
  • R. Moliński
  • E. Kopnin
  • M. Angst
  • A. Wiśniewski
  • R. Puźniak
  • J. Hofer
  • C. Rossel
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 545)

Abstract

High gas pressure up to llkbar has been applied for the synthesis of cuprates. Both single crystals and polycrystalline samples of Hg-based superconductors and quasi-one-dimensional A1−x CuO2 (A =Sr,Ca, Ba) compounds have been obtained. The influence of substitutions and oxygen content on the magnetic flux-pinning properties of single crystals of Hg-based superconductors has been investigated. The irreversibility field of almost optimally doped, unsubsti-tuted HgBa2Ca2Cu3O8+δ crystal (Tc = 130 K) is about two-three times larger than the one of underdoped crystal (Tc = 120 K). As a result of Re substitution for Hg a significant improvement of the irreversibility line position for a Hgo.77Re0.23Ba2Ca2Cu3O8+δ crystal is observed only at low temperatures (below 80 K). Neutron irradiation of HgBa2Ca2Cu3O8+δ crystal enhances the flux pinning, while also leading to a decrease of the effective mass anisotropy. The magnetic properties of infinite-chain cuprates Cao.83CuO2, Sr0.73CuO2 and Bao.66CuO2 have been studied. Susceptibility measurements give some evidence for a singlet ground state. However, all these compounds order antiferromagnetically at T < 10 K. Specific heat, elastic neutron scattering of polycrystalline material and magnetic torque on single crystals have been measured. These measurements give clear evidence that the AF ordered state is of long-range 3D character.

Keywords

CuO2 Plane Singlet Ground State Magnetic Torque Irreversibility Line Irreversibility Field 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • J. Karpiński
    • 1
  • G. I. Meijer
    • 1
  • H. Schwer
    • 1
  • R. Moliński
    • 1
  • E. Kopnin
    • 1
  • M. Angst
    • 1
  • A. Wiśniewski
    • 2
  • R. Puźniak
    • 2
  • J. Hofer
    • 3
  • C. Rossel
    • 4
  1. 1.Laboratorium für Festkörperphysik d. ETHZürichSwitzerland
  2. 2.Institute of PhysicsPolish Academy of SciencesWarsawPoland
  3. 3.Physik Institut der Universität ZürichZürichSwitzerland
  4. 4.IBM Research DivisionRüschlikonSwitzerland

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