Correlations between physical and crystallographic parameters in the (Bi,Pb)[sub 2](Ca,Y)Cu[sub 2]O[sub 8+[delta]] superconductors

Conference · Sun Dec 20 04:00:00 EST 1998 · International Journal of Modern Physics B

OSTI ID:6195532

Manifacier, L; Collin, G ^[1]; Blanchard, N ^[2]

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1. CE-Saclay, Gif sur Yvette (France). Lab. Leon Brillouin
2. Univ. Paris 11 Paris Sud, Orsay (France). Lab. de Physique des Solides

Systematic studies of the lead and yttrium substituted Bi-2212 phase were performed on various compositions ranging between 0 and 0.8 for Pb and between 0 and 0.9 for Y. Crystallographic measurements reveal that the two modulations observed in unleaded and highly Pb-substituted samples are closely linked, the main differences being that the commensurate component disappears in type II (lead type) modulation, along with the modulation of the Bi[sup 3+] ion. The authors argue that this is due to a covalent bonding between Bi-O planes. The study of internal parameters, including modulation amplitudes, of the Bi[sub 2]Sr[sub 2](Ca[sub 1[minus]x], Y[sub x]) Cu[sub 2]O[sub 8+x/2+[delta]] system reveals three distinct regimes with very different behaviors, corresponding to the overdoped, underdoped and insulating regimes. By comparing these results to the variation of the diamagnetic shielding with Y and Pb contents, the authors conclude that yttrium and lead affect more the mobility of the holes than the hole concentration itself. Y seems to induce, rather than a metal/insulator transition, a switch from a three-dimensional to a two-dimensional regime with a hole localization in the CuO[sub 2] planes.

• OSTI ID: 6195532
• Report Number(s): CONF-980291--
• Conference Information: Journal Name: International Journal of Modern Physics B Journal Volume: 12:29-31
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARRIER MOBILITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH-TC SUPERCONDUCTORS
HOLES
LEAD COMPOUNDS
LEAD OXIDES
MOBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES