On two symmetry modifications of DyBa2Cu3O<i>x</i> HTSC single crystals
É. A. Zavadskiı̆Physicotechnical Institute, Ukrainian Academy of Sciences, T. Luxemburg st., 72, 340144 DonetskV. I. KamenevPhysicotechnical Institute, Ukrainian Academy of Sciences, T. Luxemburg st., 72, 340144 DonetskE. N. MalyshevPhysicotechnical Institute, Ukrainian Academy of Sciences, T. Luxemburg st., 72, 340144 DonetskL. T. TsymbalPhysicotechnical Institute, Ukrainian Academy of Sciences, T. Luxemburg st., 72, 340144 DonetskA. N. CherkasovPhysicotechnical Institute, Ukrainian Academy of Sciences, T. Luxemburg st., 72, 340144 Donetsk
ABI
Abstract
Under oxygen enrichment the initially nonsuperconducting DyBa2Cu3Ox single crystal (αT0 = 3.876 Å, cT0= 11.824 Å) has been found to undergo a transformation to a stable heterogeneous state including two modifications, the usual rhombic one (αR = 3.844 Å, bR = 3.895 Å) and a new tetragonal one (αT = αT0 = 3.876 Å) with coincident parameter c = cR = cT = 11.729 Å≠cT0. A possible formation mechanism of the heterogeneous state, viz., deformation-blocked rhombic phase nucleation, is suggested.
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