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Journal of Low Temperature Physics

, Volume 159, Issue 1–2, pp 118–121 | Cite as

High Magnetic Field Micro-Calorimeter and Application for BE-Condensation of Cr5+ Dimer System

  • T. Zenmoto
  • Y. Oshima
  • H. Nojiri
  • S. H. Lee
  • M. Kofu
Article

Abstract

A micro-calorimeter working at ultra-low temperature down to 75 mK and high magnetic field up to 17.5 T has been developed. A typical sample weight is as small as 100 μg. A magnetic phase diagram of magnon Bose-Einstein condensation (BEC) in Ba3Cr2O8 is determined. The scaling index of the phase boundary is very close to that of the isotropic three dimensional BEC at low temperature, in spite of the existence of Dzyaloshinskii-Moriya (DM) interaction which is confirmed in the previous ESR measurement.

Keywords

Calorimeter Magnon BEC 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • T. Zenmoto
    • 1
  • Y. Oshima
    • 2
  • H. Nojiri
    • 1
  • S. H. Lee
    • 3
  • M. Kofu
    • 4
  1. 1.Institute for Materials ResearchTohoku UniversitySendaiJapan
  2. 2.Condensed Molecular Materials LaboratoryRIKENWakoJapan
  3. 3.Department of PhysicsUniversity of VirginiaCharlottesvilleUSA
  4. 4.Institute for Solid State PhysicsUniversity of TokyoKashiwaJapan

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