Growth of (Y sub(1-x)Ca sub(x)Ba sub(2)Cu sub(4)O sub(8) in ambient pressure and its tri-axial magnetic alignment

We report the growth of single crystals in ambient pressure and tri-axial orientation under modulated rotation magnetic fields (MRFs) for (Y sub(1-x)Ca sub(x))Ba sub(2)Cu sub(4)O sub(8) [(Y sub(1-x)Ca sub(x))124] with x [< or =, slant] 0.1. Rectangular (Y sub(1-x)Ca sub(x))124 crystals approximat...

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Bibliographic Details
Published in:Superconductor science & technology 2015-10, Vol.28 (10), p.1-9
Main Authors: Horii, S, Yamaki, M, Shimoyama, J, Kishio, K, Doi, T
Format: Article
Language:English
Subjects:
Alignment
COPPER OXIDE
MAGNETIC FIELD
Magnetic fields
MAGNETIC PERMEABILITY
Magnetorheological fluids
Orientation
PERMEABILITY
PRESSURE
SINGLE CRYSTALS
Solid state physics
SUPERCONDUCTIVITY
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Summary:We report the growth of single crystals in ambient pressure and tri-axial orientation under modulated rotation magnetic fields (MRFs) for (Y sub(1-x)Ca sub(x))Ba sub(2)Cu sub(4)O sub(8) [(Y sub(1-x)Ca sub(x))124] with x [< or =, slant] 0.1. Rectangular (Y sub(1-x)Ca sub(x))124 crystals approximately 50 mu m in size have been successfully grown for x [< or =, slant] 0.1 in a growth temperature region from 650 [degrees]C to 750 [degrees]C. Their critical temperatures increased with x and exhibited approximately 91 K for x = 0.1. By applying an MRF of 10 T, pulverised powders of (Y sub(1-x)Ca sub(x))124 were tri-axially aligned in epoxy resin at room temperature in a whole x region below x = 0.1. The magnitude relationship of the magnetic susceptibilities ( chi ) along crystallographic directions for (Y sub(1-x)Ca sub(x))124 was chi sub(c) > chi sub(a) > chi sub(b) at room temperature and was unchanged with a change in x. From changes in the degrees of the c-axis and the in-plane orientation ( Delta omega ) for the (Y sub(1-x)Ca sub(x))124 powder samples aligned under three different MRF conditions, it was found that MRFs above at least 1 T were required to achieve almost complete tri-axial alignment with Delta omega < 5[degrees]. Irreversibility lines for H//c were successfully determined even from the powder samples by the introduction of magnetic alignment without using single crystalline samples. The present study indicates that magnetic alignment is a useful process for the fabrication of quasi-single-crystals from the perspective of solid-state physics and the production of cuprate superconducting materials.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/28/10/105003