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Microscopic origin of dimerization in the CuO 2 chains in Sr 14 Cu 24 O 41

Microscopic origin of dimerization in the CuO 2 chains in Sr 14 Cu 24 O 41 The interplay between structure and magnetic properties of Sr 14 Cu 24 O 4 1 + δ with CuO 2 chain and Cu 2 O 3 ladder building blocks is studied as a function of oxygen nonstoichiometry. The characteristic decrease in the magnetic susceptibility below 80 K for δ≊0 disappears both with increasing and decreasing δ, and, correspondingly, the periodicity of the superstructure, which arises from the lattice mismatch along the chain direction between the two structure blocks, shows a significant change. The microscopic origin of the singlet ground state is suggested to be the localization of electrons at low temperature in dimers on structurally modulated CuO 2 chains. © 1996 The American Physical Society. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Microscopic origin of dimerization in the CuO 2 chains in Sr 14 Cu 24 O 41

Hiroi, Z
Physical Review B , Volume 54 (22) – Dec 1, 1996
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1996 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.54.15849
Publisher site
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Abstract

The interplay between structure and magnetic properties of Sr 14 Cu 24 O 4 1 + δ with CuO 2 chain and Cu 2 O 3 ladder building blocks is studied as a function of oxygen nonstoichiometry. The characteristic decrease in the magnetic susceptibility below 80 K for δ≊0 disappears both with increasing and decreasing δ, and, correspondingly, the periodicity of the superstructure, which arises from the lattice mismatch along the chain direction between the two structure blocks, shows a significant change. The microscopic origin of the singlet ground state is suggested to be the localization of electrons at low temperature in dimers on structurally modulated CuO 2 chains. © 1996 The American Physical Society.

Journal

Physical Review B – American Physical Society (APS)

Published: Dec 1, 1996

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