X-ray diffuse scattering experiments from bismuth-based high-T{sub c} superconductors

Journal Article · Tue Aug 01 00:00:00 EDT 2006 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.74.054512· OSTI ID:20853487

Izquierdo, M ^[1]; Megtert, S ^[1]; Albouy, J P ^[2]; Avila, J; Valbuena, M A ^[1]; Gu, G ^[3]; Abell, J S; Yang, G ^[4]; Asensio, M C ^[1]; Comes, R ^[1]

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1. LURE, Centre Universitaire Paris-Sud, Bat.209D, B.P. 34, 91898 Orsay Cedex (France)
2. Laboratoire Physique des Solides, Centre Universitaire Paris-Sud, Bat. 510, 91405 Orsay Cedex (France)
3. Physics Department, Building 510B, Brookhaven National Laboratory, Upton, New York 11975-5000 (United States)
4. School of Metallurgy and Materials Science, University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)

A detailed study, by x-ray diffuse scattering, of the recently found two-dimensional (2D) displacive short-range-order (2DSRO) superstructure, with doubled periodicity along the orthorhombic a{sub o} direction and perpendicular to the known long-range structural modulation, from the high-T{sub c} superconductor Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (Bi-2212) is reported. The investigation has been extended to high and low temperatures for optimally doped crystals, to crystals with different doping levels, and to the one layer compound Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 6+{delta}} (Bi-2201). The results show that the 2DSRO is present at room temperature, for all studied crystals and with the same commensurate 2a{sub o} periodicity; significant differences in intensity and in the extent of the 2DSRO are however observed. The most striking feature is that both, the intensity of the diffuse scattering and the extent of the 2DSRO goes through a maximum for the optimal doped crystals and decreases for overdoped and underdoped samples, they are also smaller for the one layer Bi-2201 which has a lower T{sub c}. The reversible temperature dependence reveals that the diffuse scattering is unchanged between 35 K and 300 K, but starts washing out for higher temperatures and vanishes around 450 K, temperature above which another scattering, one dimensional in character, is found. This one-dimensional (1D) short-range order (1DSRO) corresponds to linear correlated displacements along the pseudotetragonal directions of the Cu-O-Cu chains. These findings tend to show that these short-range ordering features may be of importance for a better understanding of high-T{sub c} materials, at least those from the bismuth-based family.

• OSTI ID: 20853487
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 5; Other Information: DOI: 10.1103/PhysRevB.74.054512; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CRYSTALS
CUPRATES
DIFFUSE SCATTERING
DOPED MATERIALS
HIGH-TC SUPERCONDUCTORS
LAYERS
MODULATION
ORTHORHOMBIC LATTICES
PERIODICITY
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
X RADIATION
X-RAY DIFFRACTION