Group-theoretical analysis of possible structural phase transitions in the high-temperature superconductors

A group-theoretical analysis is performed for the complete condensation of order parameters at structural phase transitions (SPT's) in the high-temperature superconductors belonging to the D 17 4h -14/mmm space group in the high-symmetry phase. As a rule, such transformations are due to a succe...

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Veröffentlicht in:	Phase transitions 1990-06, Vol.22 (1-4), p.245-255
Hauptverfasser:	Aleksandrov, K. S., Misyul, S. V., Ivanova, T. I., Sakhnenko, V. P., Chechin, G. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Crystalline state (including molecular motions in solids) Crystallographic aspects of phase transformations pressure effects Exact sciences and technology irreducible representation order parameters Physics Structural phase transitions Structure of solids and liquids crystallography
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Zusammenfassung:	A group-theoretical analysis is performed for the complete condensation of order parameters at structural phase transitions (SPT's) in the high-temperature superconductors belonging to the D 17 4h -14/mmm space group in the high-symmetry phase. As a rule, such transformations are due to a successive softening of phonons with wave vectors k 1 = 1/2 b 3 and k 2 = 1/2 (b 1 - b 3 ) belonging to the K13(X) star of the Brillouin zone of a tetragonal body-centered Bravais cell. SPT's in system La 2-x Ba x CuO 4 are considered in detail.
ISSN:	0141-1594 1029-0338
DOI:	10.1080/01411599008207227