Study on CuGe0.9885Si0.0115O3 in high magnetic fields by specific heat measurements

Masahiko Hiroi, Masafumi Sera, Norio Kobayashi, Jun Akimitsu

Research output: Contribution to journalArticlepeer-review


Specific heat is measured for a single crystal of CuGe1-xSixO3 (x = 0.0115) in magnetic fields up to 14.5 T. In zero field two peaks at approximately 3 and approximately 10 K were observed, suggesting that the coexistence of the antiferromagnetic and spin-Peierls orders are realized. In our previous measurements of specific heat in high-field region around 15 T a small but clear anomaly was observed at approximately 4.2 K for x = 0.01, while a sharp peak was observed at approximately 5 K for x = 0.015, which corresponds to the transition in the magnetic-field-induced phases between M phase and M′ phase. They appear very different from each other. In the present study for x = 0.0115 we observe a clear peak at 14.5 T which is just intermediate between those for x = 0.01 and 0.015 in temperature and in size. This systematic change in the transition with varying x shows that these transitions in the high-field phases are of the same kind in this range of x, though it also shows that small change in Si concentration affects the magnetic-field-induced states to a large extent.

Original languageEnglish
Pages (from-to)669-670
Number of pages2
JournalPhysica B: Condensed Matter
Issue number282
Publication statusPublished - Jun 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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