Magnetic phase diagrams of CuGe1-xSixO3 studied by specific heat measurements

M. Hiroi, T. Hamamoto, M. Sera, H. Nojiri, N. Kobayashi, M. Motokawa, O. Fujita, A. Ogiwara, J. Akimitsu

Research output: Contribution to journalArticle

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Abstract

The specific heat, C, of single crystals of CuGe1-xSixO3 (x = 0, 0.005, 0.008, 0.01, 0.015, 0.02, 0.027, 0.05) under magnetic field up to 15 T were measured and their magnetic phase diagrams were determined. The compounds with x ≤ 0.015 exhibit two transitions at TSP and TN in low magnetic field. An upturn of C/T for x = 0.005 and 0.008 below ∼ 3 K originating from the AF ordering at lower temperatures is suppressed by magnetic field as in the case for x = 0.01. However, the existence of M′ phase above ∼ 10 T which was observed for x = 0.01 was not recognized for x = 0.005 and 0.008, which suggests the existence of a critical x value for the appearance of M′ phase.

Original languageEnglish
Pages (from-to)242-245
Number of pages4
JournalPhysica B: Condensed Matter
Volume246-247
DOIs
Publication statusPublished - 1998 May 29

Keywords

  • CuGeO
  • Impurity effect
  • Magnetic phase diagram
  • Spin-Peierls state

ASJC Scopus subject areas

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

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    Hiroi, M., Hamamoto, T., Sera, M., Nojiri, H., Kobayashi, N., Motokawa, M., Fujita, O., Ogiwara, A., & Akimitsu, J. (1998). Magnetic phase diagrams of CuGe1-xSixO3 studied by specific heat measurements. Physica B: Condensed Matter, 246-247, 242-245. https://doi.org/10.1016/S0921-4526(97)00906-X