Enhancement of magnetic order in the incommensurate phase of Mg-doped CuGeO3

C Stock*, S Wakimoto, RJ Birgeneau, S Danilkin, J Klenke, P Smeibidl, P Vorderwisch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present neutron elastic scattering results at high magnetic fields for Mg-doped CuGeO3. For low magnesium concentrations, where a spin-Peierls phase is present, we find an enhancement of the long range antiferromagnetic order in the structural incommensurate phase induced by a high magnetic field. In the incommensurate phase, the Neel temperature increases with field leading to a gain in the magnetic Bragg peak intensity at low temperatures. We also find that the magnetic Bragg peaks remain commensurate even though the structure is incommensurate at high magnetic fields due to the formation of solitons. We interpret these results in terms of the solitons formed at high-magnetic fields effectively acting as doped impurities. Our results point to a strongly disordered ground state with the antiferromagnetic order localized around impurity sites.

Original languageEnglish
Pages (from-to)746-752
Number of pages7
JournalJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume74
Issue number2
DOIs
Publication statusPublished - Feb 2005

Keywords

  • spin-Peierls
  • neutron scattering
  • doping
  • CuGeO3
  • SPIN-PEIERLS TRANSITION
  • HEISENBERG ANTIFERROMAGNETIC CHAINS
  • NEUTRON-SCATTERING
  • SOLITON LATTICE
  • EXCITATIONS
  • SUSCEPTIBILITY
  • TEMPERATURE
  • IMPURITIES
  • CRYSTAL
  • SYSTEMS

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