High-Field Magnetostriction of the Spin-State Transition Compound LaCoO<SUB>3</SUB>

• Sato Keisuke

  Institute for Solid State Physics, University of Tokyo

• Bartashevich Mikhail I.

  Institute for Solid State Physics, University of Tokyo

• Goto Tsuneaki

  Institute for Solid State Physics, University of Tokyo

• Kobayashi Yoshihiko

  Department of Applied Physics and Chemistry, The University of Electro-Communications

• Suzuki Masaru

  Department of Applied Physics and Chemistry, The University of Electro-Communications

• Asai Kichizo

  Department of Applied Physics and Chemistry, The University of Electro-Communications

• Matsuo Akira

  Institute for Solid State Physics, University of Tokyo

• Kindo Koichi

  Institute for Solid State Physics, University of Tokyo

Bibliographic Information

Other Title

• High-field magnetostriction of the spin-state transition compound LaCoO3

Abstract

The transverse and longitudinal magnetostrictions of LaCoO₃ have been measured in pulsed magnetic fields of up to 35 T in the temperature range between 4.2 and 300 K. The magnetostrictions are proportional to the squared magnetic field of up to B₀=25 T. The magnetostrictions at B<B₀ are analyzed with a spin-state transition model involving a nonmagnetic ground state and a magnetic excited state for Co ions where Co ions in the latter have a larger optimum lattice volume than those in the former. The observed magnetostrictions are well interpreted by the excited state with g=3.35 and the excitation energy of Δ=140 K, which are consistent with those obtained in an electron spin resonance study [Noguchi et al.: Phys. Rev. B 66 (2002) 094404] but do not reproduce the observed magnetization. The analysis based on the model and a comparison of the present data to the pressure dependence of the magnetization suggest that the elastic energy represented in terms of only the lattice volume is insufficient for the quantitative description of magnetoelastic phenomena in LaCoO₃. A sharp increase in the longitudinal magnetostriction with a large hysteresis observed in B>B₀ and T>60 K is ascribed to a change in the domain structure of the twinned LaCoO₃ crystal induced by a magnetic field.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 77 (2), 024601-024601, 2008

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• magnetostriction
• spin-state transtion
• LaCoO<SUB>3</SUB>
• high-field magnetization

Details

• CRID: 1390282679175078144
• NII Article ID: 130005436354
• NII Article ID: 110006613890
• NII Article ID: 210000107097
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.77.024601
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 9377660
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9377660
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.77.024601
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed