Electrical conductivity of YBa2Cu3O7-δ single crystals under conditions of anionic ordering in Cu(1)O1-δ layers
https://doi.org/10.17073/1609-3577-2020-1-71-77
Abstract
The influence of thermocycling annealing processes on the oxygen ordering degree (order parameter) in theYBa2Cu3O7-δ single crystals have been studied. It was determined that an increase in the critical temperature of the onset of the transition to the superconducting state during step annealing procedures is consistent with decrease of the σс/σаb parameter. This fact indicates the redistribution of the electronic density between the Cu(2)O2 and Cu(1)O1-d structurally-inhomogeneous planes, due to the formation of the oxygen long-range ordering in the O(4)—Cu(1)—O(4) linear groups along the (b) crystal structure axis of the unit cell, and removal of the oxygen defects in the square nets of the Cu(2)O2 planes. The existence of a critical value of the conductivity anisotropy σс/σаb, below which its behavior does not correlate with the change of Тс, has been proved. In this case, the increase of Тс and the orthorhombic distortion of the crystal structure at the isothermal annealing processes occur due to the amplification of the «interlayer» interaction between the Cu(2)О2 and Cu(1)О1-δ planes. As a result, the contribution of the Cu(1)О1-δ chain layers in the electronstate density on the Fermi level increases. These layers could be the superconducting ones by means of the Cooper pairs tunneling from the Cu(2)О2 planes, forming the induced superconductivity there.
Keywords
high-temperature superconductivity,
YBa2Cu3O7-δ single crystals,
oxygen non-stoichiometry,
electrical conductivity,
order parameter
Supporting agencies: This work was carried out in frames of the European Union project H2020-MSCA-RISE-2017-778308 — SPINMULTIFILM and the Task No. 1.02 of the State program of scientific research of the Republic of Belarus “Physical materials science, new materials and technologies” subprogram “Materials science and materials technologies”.
About the Author
N. A. Kalanda
Scientific-Practical Materials Research Centre of the NAS of Belarus,
19 P. Brovka Str., Minsk 220072
Belarus
Belarus
Nikolay A. Kalanda: Cand. Sci. (Phys.-Math.), Leading Researcher
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For citations:
Kalanda N.A. Electrical conductivity of YBa2Cu3O7-δ single crystals under conditions of anionic ordering in Cu(1)O1-δ layers. Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering. 2020;23(1):71-77. (In Russ.) https://doi.org/10.17073/1609-3577-2020-1-71-77
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