Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion, and shear modulus measurements
Nematicity in LaFeAsO single crystals is studied by means of high-resolution thermal expansion, shear modulus, and elastoresistivity measurements. A softening of the shear modulus 𝐶66 towards the structural phase transition at 𝑇S is observed. In addition, a similar Curie-Weiss-like divergence of the...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
1 December 2025
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| In: |
Physical review
Year: 2025, Volume: 112, Issue: 23, Pages: 1-9 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/jk25-fcq1 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/jk25-fcq1 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/jk25-fcq1 
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| Author Notes: | X.C. Hong, S. Sauerland, L. Wang, F. Scaravaggi, A.U.B. Wolter, R. Kappenberger, S. Aswartham, S. Wurmehl, S. Sykora, F. Caglieris, B. Büchner, C. Hess, and R. Klingeler |
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| 245 | 1 | 0 | |a Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion, and shear modulus measurements |c X.C. Hong, S. Sauerland, L. Wang, F. Scaravaggi, A.U.B. Wolter, R. Kappenberger, S. Aswartham, S. Wurmehl, S. Sykora, F. Caglieris, B. Büchner, C. Hess, and R. Klingeler |
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| 520 | |a Nematicity in LaFeAsO single crystals is studied by means of high-resolution thermal expansion, shear modulus, and elastoresistivity measurements. A softening of the shear modulus 66 towards the structural phase transition at S is observed. In addition, a similar Curie-Weiss-like divergence of the nematic susceptibilities is found in the temperature dependence of both sh and er, which are deduced from the shear modulus (sh) and the elastoresistivity (er) studies, respectively. These observations provide evidence for an electronic origin of nematicity in LaFeAsO. The characteristic energy of the coupling between the lattice and the electronic degrees of freedom is deduced to ≈30K. The comparison to corresponding measurements on BaFe2As2 single crystals reveals a very similar temperature dependence of the shear modulus but yields contrasting results for er : In BaFe2As2, er diverges similarly as the uncoupled nematicity deduced from the shear modulus data as it is expected from the underlying Landau theory. In contrast, the Weiss temperatures of er and sh are significantly different in LaFeAsO. This difference is at odds with the commonly anticipated theories of resistivity anisotropy and electronic nematicity in iron pnictides. | ||
| 700 | 1 | |a Sauerland, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wang, L. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Scaravaggi, F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wolter, A. U. B. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kappenberger, R. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Aswartham, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wurmehl, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sykora, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Caglieris, F. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Büchner, B. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hess, C. |e VerfasserIn |4 aut | |
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