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A temperature-modulated dilatometer by using a piezobender-based device.

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A new temperature-modulated dilatometer measures thermal expansion in thin samples with high resolution. This device is effective for studying phase transitions and vortex dynamics in superconductors, even under high magnetic fields.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Experimental physics

Background:

  • Accurate measurement of thermal expansion is crucial for understanding material properties.
  • Existing dilatometry methods may have limitations in resolution or sample requirements, especially under extreme conditions.

Purpose of the Study:

  • To introduce a novel temperature-modulated dilatometer design.
  • To demonstrate its capability for high-resolution measurements of linear thermal expansion.
  • To showcase its application in studying complex materials like superconductors.

Main Methods:

  • Utilizing a piezobender to detect sample length oscillations.
  • Employing a thermocouple for precise temperature monitoring.
  • Measuring oscillating changes in sample length and temperature.

Main Results:

  • The new dilatometer successfully measures the linear thermal expansion coefficient.
  • Demonstrated high-resolution measurements on thin samples of KFe2As2 (an iron-based superconductor).
  • Effective operation at low temperatures and high magnetic fields.

Conclusions:

  • The developed dilatometer offers a high-resolution method for studying thermal properties.
  • It is suitable for investigating phenomena like phase transitions and vortex dynamics.
  • The prototype design has potential for further optimization and broader applications.