Structure-property relationships in the layered cuprate La[sub 2-x]Sr[sub x]CuSnO[sub 6]

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1019· OSTI ID:6925932

Anderson, M T; Poeppelmeier, K R ^[1]; Gramsch, S A; Burdett, J K ^[2]

---

1. Northwestern Univ., Evanston, IL (United States)
2. Univ. of Chicago, IL (United States)

In an attempt to induce a metallic or superconductive state in the layered cuprate La[sub 2]CuSnO[sub 6], the series La[sub 2-x]Sr[sub x]CuSnO[sub 6-x/2+[delta]] (x = 0.00, 0.05, 0.10, 0.125, 0.15, 0.175, 0.20) was prepared. A solid solution forms for 0.00 < x < 0.175, the overall oxygen content is 6.00 (3), and the samples are antiferromagnetic semiconductors. From neutron diffraction experiments, the compounds possess distinct copper-oxygen and tin-oxygen layers. There is a mismatch at the interface of the layers, which results in expansion of the copper-oxygen layers. There is a mismatch at the interface of the layers, which results in expansion of the copper-oxygen bond lengths (1.99 [angstrom] average). The copper is oxidized upon addition of strontium; however, in contrast to p-type cuprate superconductors, the in-plane copper-oxygen bond lengths increase and the axial bonds decrease. The interleaved tin-oxygen layers have a dramatic effect on the crystal chemistry, electronic structure, and properties. The electronic consequence is that empty upper and filled lower dx[sup 2] - y[sup 2] bands (upper and lower Hubbard bands) remain separated and narrow upon oxidation, which presumably prohibits superconductivity.

• OSTI ID: 6925932
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 102:1; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ALKALINE EARTH METALS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CUPRATES
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
ELEMENTS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC SEMICONDUCTORS
MATERIALS
METALS
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SEMICONDUCTOR MATERIALS
STRONTIUM
SUPERCONDUCTIVITY
TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENT COMPOUNDS