Spin Gap at the Phase Transition between Spin Liquid and Long-Range Ordered State in La1-xSrxCuO2.5.

• Sugai S.

  Department of Physics, Faculty of Science, Nagoya university

• Shinoda T.

  Department of Physics, Faculty of Science, Nagoya university

• Kobayashi N.

  Institute for Chemical Research, Kyoto University

• Hiroi Z.

  Institute for Chemical Research, Kyoto University

• Takano M.

  Institute for Chemical Research, Kyoto University

Bibliographic Information

Other Title

• Spin Gap at the Phase Transition betwee

Abstract

Two-leg spin S=1/2 antiferromagnetic (AF) spin ladder compound LaCuO_{2. 5} resides near the quantum critical point. The spin gap at the quantum phase transition from the spin liquid state to the pseudo AF long-range ordered state at about 120 K was investigated by Raman scattering. As temperature increases from 20 K, a dip appears at about 300cm_-1 in the magnetic excitation spectrum and develops toward low energy keeping the upper bound at 320 cm_-1 and reaches ω∼0 at about 120 K. The in-gap states decrease with further increase of temperature and the gap opens at about 200 K. The low temperature phase below 120 K is not a simple Neel state.

Journal

• The Review of High Pressure Science and Technology

  The Review of High Pressure Science and Technology 7 571-573, 1998

  The Japan Society of High Pressure Science and Technology

Keywords

• spin ladder
• spin gap
• spin liquid
• quantum critical point
• Raman scattering

Details

• CRID: 1390282679359294080
• NII Article ID: 10002691042
• NII Book ID: AN10452913
• DOI: 10.4131/jshpreview.7.571
• ISSN: 13481940
• ISSN: 0917639X
• NDL BIB ID: 4493985
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4493985
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed