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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2408.07781 |
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| _version_ | 1866910566070616064 |
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| author | White, B. D. Huang, K. Fipps, I. L. Hamlin, J. J. Jang, S. Smith, G. J. Xia, B. Simonson, J. W. Nelson, C. S. Aronson, M. C. Maple, M. B. |
| author_facet | White, B. D. Huang, K. Fipps, I. L. Hamlin, J. J. Jang, S. Smith, G. J. Xia, B. Simonson, J. W. Nelson, C. S. Aronson, M. C. Maple, M. B. |
| contents | We report measurements of magnetization, specific heat, and thermal expansion performed on As-deficient MnAs single crystals (MnAs$_{0.968}$). Ferromagnetic order is observed near $T_C \simeq$ 306 K on warming and $T_C \simeq$ 302 K on cooling, which is consistent with previously-reported values for stoichiometric MnAs samples. In contrast, the second-order structural phase transition is observed at $T_S \simeq$ 353 K, which is nearly 50 K lower than in the stoichiometric compound. We observe differences in the thermal expansion of our samples when compared to reports of stoichiometric MnAs including: (1) the $\sim$1.5% volume decrease at $T_C$ is smaller than the expected value of 1.9%, (2) the lattice parameters perpendicular to the basal plane exhibit a discontinuous jump of $\sim$1.1% at $T_C$ instead of being continuous across $T_C$, and (3) thermal expansion perpendicular to the basal plane for $T_C \le T \le$ 315 K is negative rather than positive. We also observe a correlation between the ratio of hexagonal lattice parameters, $c/a$, and $T_S$, strongly suggesting that the degree of structural anisotropy in MnAs could play an important role in tuning $T_S$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_07781 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable Second-Order Structural Transition in As-Deficient MnAs White, B. D. Huang, K. Fipps, I. L. Hamlin, J. J. Jang, S. Smith, G. J. Xia, B. Simonson, J. W. Nelson, C. S. Aronson, M. C. Maple, M. B. Strongly Correlated Electrons We report measurements of magnetization, specific heat, and thermal expansion performed on As-deficient MnAs single crystals (MnAs$_{0.968}$). Ferromagnetic order is observed near $T_C \simeq$ 306 K on warming and $T_C \simeq$ 302 K on cooling, which is consistent with previously-reported values for stoichiometric MnAs samples. In contrast, the second-order structural phase transition is observed at $T_S \simeq$ 353 K, which is nearly 50 K lower than in the stoichiometric compound. We observe differences in the thermal expansion of our samples when compared to reports of stoichiometric MnAs including: (1) the $\sim$1.5% volume decrease at $T_C$ is smaller than the expected value of 1.9%, (2) the lattice parameters perpendicular to the basal plane exhibit a discontinuous jump of $\sim$1.1% at $T_C$ instead of being continuous across $T_C$, and (3) thermal expansion perpendicular to the basal plane for $T_C \le T \le$ 315 K is negative rather than positive. We also observe a correlation between the ratio of hexagonal lattice parameters, $c/a$, and $T_S$, strongly suggesting that the degree of structural anisotropy in MnAs could play an important role in tuning $T_S$. |
| title | Tunable Second-Order Structural Transition in As-Deficient MnAs |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.07781 |