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Coupling between a Charge Density Wave and Magnetism in an Heusler Material.
G Lantz1, M J Neugebauer1, M Kubli1
1Institute for Quantum Electronics, Physics Department, ETH Zurich, CH-8093 Zurich, Switzerland.
Physical Review Letters
|December 30, 2017
Summary
Photoinduced demagnetization in Ni_{2}MnGa affects the Fermi surface, influencing the structural modulation. This study tracks magnetic and structural changes during phase transitions in this shape memory alloy.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Ni_{2}MnGa is a prototypical magnetic shape memory alloy exhibiting phase transitions.
- A low-temperature incommensurate structural modulation occurs below 260 K, potentially linked to phonon mode softening.
- The relationship between this modulation and the magnetic memory effect remains unclear.
Purpose of the Study:
- To investigate the interplay between structural and magnetic components during phase transitions in Ni_{2}MnGa.
- To elucidate the influence of photoinduced demagnetization on the modulated cubic to high-symmetry phase transition.
- To understand the coupling mechanisms between electronic structure and lattice distortions.
Main Methods:
- Time-resolved measurements were employed to track both structural and magnetic changes.
- The study focused on the transition from the modulated cubic phase to the high-symmetry phase.
- Photoinduced demagnetization was used as a perturbation to probe the system's response.
Main Results:
- Photoinduced demagnetization was observed to modify the Fermi surface.
- These modifications were found to couple strongly with the structural modulation's periodicity via the nesting vector.
- The amplitude of the periodic lattice distortion showed less sensitivity to demagnetization.
Conclusions:
- The findings suggest a direct link between electronic structure modifications and the observed structural modulation in Ni_{2}MnGa.
- The study provides insights into the mechanisms governing phase transitions in magnetic shape memory alloys.
- This research contributes to understanding the fundamental physics of coupled magnetic and structural phenomena.
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