Landau–Khalatnikov theory of anelastic relaxations in spin-crossover materials

Abstract

Large anelastic relaxations have been found near the transition temperature in spin crossover (SCO) materials due to stress-induced changes in spin state. To investigate the mechanistic aspects of this phenomenon, we develop here a phenomenological framework, based on the Landau theory of phase transitions, incorporating coupling terms between spin state and elastic strain, which is also extended to the dynamic Landau-Khalatnikov regime. We derive an analytical solution for the mechanical response and conduct a parametric study of a cubic SCO system. Our simulations reveal bulk modulus relaxation, internal friction peaks and renormalization of elastic constants near the spin transition-qualitatively matching recent nanoindentation experiments. The work clarifies the roles of bilinear and higher-order couplings in shaping static and dynamic elastic anomalies, with relevance for mechanical actuator design.

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BibTeX

@article{nasimsobhan2026landaukhalatnikov,
  title = {{Landau–Khalatnikov theory of anelastic relaxations in spin-crossover materials}},
  author = {Maryam Nasimsobhan and Melvyn Larranaga and William Nicolazzi and Gábor Molnár and Azzedine Bousseksou},
  journal = {Journal of Physics: Condensed Matter},
  year = {2026},
  month = sep,
  doi = {10.1088/1361-648x/aea50d},
  url = {https://hal.science/hal-05759811v1},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - Landau–Khalatnikov theory of anelastic relaxations in spin-crossover materials
AU  - Maryam Nasimsobhan
AU  - Melvyn Larranaga
AU  - William Nicolazzi
AU  - Gábor Molnár
AU  - Azzedine Bousseksou
PY  - 2026
DA  - 2026/09/22
JO  - Journal of Physics: Condensed Matter
DO  - 10.1088/1361-648x/aea50d
UR  - https://hal.science/hal-05759811v1
AB  - Large anelastic relaxations have been found near the transition temperature in spin crossover (SCO) materials due to stress-induced changes in spin state. To investigate the mechanistic aspects of this phenomenon, we develop here a phenomenological framework, based on the Landau theory of phase transitions, incorporating coupling terms between spin state and elastic strain, which is also extended to the dynamic Landau-Khalatnikov regime. We derive an analytical solution for the mechanical response and conduct a parametric study of a cubic SCO system. Our simulations reveal bulk modulus relaxation, internal friction peaks and renormalization of elastic constants near the spin transition-qualitatively matching recent nanoindentation experiments. The work clarifies the roles of bilinear and higher-order couplings in shaping static and dynamic elastic anomalies, with relevance for mechanical actuator design.
SN  - 0953-8984
SN  - 1361-648X
ER  -

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