Twin to tweed transition in YBa2Cu3O7–δ by substitution of Al for Cu

Electro-transport and structure of 1-2-3 HTSC single crystals with different plane defects topologies

“…In some cases this may lead to the formation of the characteristic for aluminum octahedral coordination of oxygen atoms, which in turn has a significant influence on the nature and the mechanisms of carrier scattering in the basic plane [13,17]. It should be noted that despite the extensive experimental studies regarding the electric transport properties in HTSC cuprates, there is a number of very important issues that still remain undetermined.…”

“…Second, we can change, with a controlled mode, the oxygen content (and, accordingly, change their electrotransport parameters), as well as the topology of the plane defects [12,16], such as twin boundaries, which serve as an additional source of anisotropy. Thirdly, a characteristic feature of YBa 2 Cu 3 O 7-d compounds is the easy complete or partial substituting replacement of its components with its isovalent analogues [13,17], which allows variation of the superconducting properties, and thus to improvement of their physical properties.…”

“…The study of high-temperature superconducting cuprates (HTSC) remains one of the main research areas in physics of condensed materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In recent years, the major efforts of both, the theoretic physicists and the experimentalists are aimed at clarifying the nature of the rather complex phase diagram [11] of these compounds.…”

Effect of Long Aging on the Resistivity Properties of Aluminum Doped YBa2Cu3−y Al y O7−δ Single Crystals with a Given Twin Boundary Topology

“…At low concentrations, it improves conductivity and prevents the degradation of the superconducting properties in the aging process [7]. It is of particular interest to investigate the partial substitution of copper by aluminium [8][9][10][11]. Around the trivalent aluminium atoms is the typical octahedral environment from oxygen atoms, facilitating a severalfold reduction of the period of twin superstructure [10] and at high concentrations, the formation of structures intersecting the "tweed" type twin domains [11].…”

“…It is of particular interest to investigate the partial substitution of copper by aluminium [8][9][10][11]. Around the trivalent aluminium atoms is the typical octahedral environment from oxygen atoms, facilitating a severalfold reduction of the period of twin superstructure [10] and at high concentrations, the formation of structures intersecting the "tweed" type twin domains [11]. The twin boundaries (TB), being extended planar defects, promote strengthening of pinning processes [12], which extend their range in obtaining high magnetic fields.…”