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Ultra-high vacuum compatible image furnace.

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  • 1Physik-Department, Technische Universität München, Garching, Germany.

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Summary

A new ultra-high vacuum optical floating-zone furnace enables high-purity single-crystal growth of intermetallic compounds. This advanced system improves molten zone stability and crystal quality for materials like Heusler compounds.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Crystal Growth

Background:

  • Single-crystal growth of intermetallic compounds is crucial for advanced material properties.
  • Traditional methods often face challenges with purity and stability, especially for compounds with high vapor pressures.
  • Optical floating-zone furnaces offer a promising route but require specialized conditions.

Purpose of the Study:

  • To design and implement an optical floating-zone furnace system compatible with ultra-high vacuum (UHV) conditions.
  • To enhance the purity and stability of the molten zone during crystal growth.
  • To demonstrate the effectiveness of the UHV system for growing high-quality single crystals of intermetallic compounds.

Main Methods:

  • Refurbishment of a commercial image furnace to be all-metal sealed.
  • Integration of UHV rotary feedthroughs and bespoke quartz-metal seals with metal-O-rings.
  • Utilization of bespoke heating jackets for system baking and high-purity argon atmosphere up to 10 bar.
  • Application to ferromagnetic Cu(2)MnAl and antiferromagnetic Mn(3)Si Heusler compounds.

Main Results:

  • Achieved UHV compatibility for the optical floating-zone furnace.
  • Demonstrated improved molten zone stability and grain selection in Cu(2)MnAl.
  • Observed similar improvements in traveling-solvent floating-zone growth of Mn(3)Si.
  • Successfully grew high-purity single crystals of intermetallic compounds.

Conclusions:

  • The developed UHV optical floating-zone furnace is highly effective for single-crystal growth.
  • The system facilitates the growth of high-purity intermetallic compounds, including Heusler compounds.
  • This technology holds significant potential for advancing materials science research and applications.