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Magnetic Tweezers for the Measurement of Twist and Torque
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Angular dependent torque measurements on CaFe0.88Co0.12AsF.

H Xiao1, B Gao, Y H Ma

  • 1Center for High Pressure Science and Technology Advanced Research, Beijing 100094, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 28, 2016
PubMed
Summary
This summary is machine-generated.

Out-of-plane torque measurements reveal CaFe0.88Co0.12AsF (Ca1111) is highly anisotropic. This suggests weaker electronic coupling between layers in Ca1111 compared to other iron-based superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Iron-based superconductors exhibit complex electronic properties.
  • Understanding anisotropy is crucial for their technological applications.
  • CaFe0.88Co0.12AsF (Ca1111) is a notable member of this material class.

Purpose of the Study:

  • To investigate the anisotropy of CaFe0.88Co0.12AsF (Ca1111) single crystals.
  • To quantify the anisotropy parameter (γ) in the mixed state.
  • To compare the anisotropy of Ca1111 with other iron-based superconductor families.

Main Methods:

  • Out-of-plane angular dependent torque measurements.
  • Analysis of torque data in the normal and mixed states.
  • Determination of the anisotropy parameter (γ) from vortex torque.

Main Results:

  • Torque data in the normal state exhibited paramagnetic behavior.
  • In the mixed state, torque is a combination of vortex and paramagnetic contributions.
  • An anisotropy parameter γ ≈ 19.1 was determined at 11.5 K for Ca1111.
  • Ca1111 shows higher anisotropy compared to 11 and 122 families.

Conclusions:

  • CaFe0.88Co0.12AsF (Ca1111) is significantly more anisotropic than other iron-based superconductors.
  • This enhanced anisotropy likely stems from less effective electronic coupling between layers.
  • Findings provide insights into the layered electronic structure and potential applications.