Magnetic properties of the S=12 quasi-one-dimensional antiferromagnet CaCu2O3

V. Kiryukhin, Y. J. Kim, K. J. Thomas, F. C. Chou, R. W. Erwin, Q. Huang, M. A. Kastner, and R. J. Birgeneau
Phys. Rev. B 63, 144418 – Published 20 March 2001
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Abstract

We report single-crystal growth and magnetic susceptibility and neutron diffraction studies of the S=12 quasi-one-dimensional antiferromagnet CaCu2O3. The structure of this material is similar to that of the prototype two-leg spin-ladder compound SrCu2O3. However, the Cu-O-Cu bond angle in the ladder rungs in CaCu2O3 is equal to 123°, and therefore the magnetic interaction along the rung is expected to be much weaker in this material. At high temperatures, the magnetic susceptibility of CaCu2O3 can be decomposed into a contribution from one-dimensional antiferromagnetic chains or finite-size chain segments together with a weak Curie contribution. The intrachain magnetic exchange constant J, determined from the magnetic susceptibility measurements, is 2000±300 K. CaCu2O3 undergoes a Néel transition at TN=25 K with ordering wave vector of [0.429(5), 12, 12]. The magnetic structure is incommensurate in the direction of the frustrated interchain interaction. Weak commensurate magnetic Bragg peaks with the reduced wave vector (12, 12, 12) are also observed below TN. Application of a magnetic field induces a metamagnetic transition at which the incommensurability of the magnetic structure is substantially reduced. Above the transition field, the material possesses only short-range magnetic order, and no well defined temperature-driven transition is observed.

  • Received 11 September 2000

DOI:https://doi.org/10.1103/PhysRevB.63.144418

©2001 American Physical Society

Authors & Affiliations

V. Kiryukhin*, Y. J. Kim, K. J. Thomas, and F. C. Chou

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

R. W. Erwin

  • NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899

Q. Huang

  • NIST Center for Neutron Research, NIST, Gaithersburg, Maryland 20899
  • Department of Materials and Nuclear Engineering, University of Maryland, College Park, Maryland 20742

M. A. Kastner and R. J. Birgeneau

  • Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

  • *Present address: Dept. of Physics. and Astronomy, Rutgers University, Piscataway, NJ 08854.
  • Present address: Dept. of Physics, University of Toronto, Toronto, Ontario, Canada M5S1A7.

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Vol. 63, Iss. 14 — 1 April 2001

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