Al$_2$MnCu: A magnetically ordered member of the Heusler alloy family despite having a valence electron count of 24
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866912376203247616 |
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| author | Bhowmik, Soumya Pakhira, Santanu Choudhary, Renu Kumar, Ravi Urkude, Rajashri Ghosh, Biplab Bhattacharyya, D. Avdeev, Maxim Mazumdar, Chandan |
| author_facet | Bhowmik, Soumya Pakhira, Santanu Choudhary, Renu Kumar, Ravi Urkude, Rajashri Ghosh, Biplab Bhattacharyya, D. Avdeev, Maxim Mazumdar, Chandan |
| contents | The magnetic property of the Heusler alloys can be predicted by the famous Slater-Pauling (S-P) rule, which states the total magnetic moment ($m_t$) of such materials can be expressed as $m _t\,=\,(N_V-24)\,μ_B/f.u.$, where $N_V$ is the total valence electron count (VEC). Consequently, no Heusler alloys having VEC = 24 are theoretically expected as well as experimentally reported to have any magnetic ordering. Recently, a special class of Heusler alloys with 50\% concentration of $p$-block elements (anti-Heusler) have been identified, although none of such reported compounds belong to the VEC 24 category. Here, we report a new anti-Heusler alloy, Al$_2$MnCu, that undergoes long-range ferromagnetic (FM) ordering with $T_{\rm C}\sim$315 K and a large magnetic moment of $\sim$1.8 $μ_B$/f.u. despite having VEC 24. A phenomenological model based on molecular orbital hybridization is also proposed to understand the magnetism and unusual deviation from the standard S-P rule. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_09574 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Al$_2$MnCu: A magnetically ordered member of the Heusler alloy family despite having a valence electron count of 24 Bhowmik, Soumya Pakhira, Santanu Choudhary, Renu Kumar, Ravi Urkude, Rajashri Ghosh, Biplab Bhattacharyya, D. Avdeev, Maxim Mazumdar, Chandan Materials Science The magnetic property of the Heusler alloys can be predicted by the famous Slater-Pauling (S-P) rule, which states the total magnetic moment ($m_t$) of such materials can be expressed as $m _t\,=\,(N_V-24)\,μ_B/f.u.$, where $N_V$ is the total valence electron count (VEC). Consequently, no Heusler alloys having VEC = 24 are theoretically expected as well as experimentally reported to have any magnetic ordering. Recently, a special class of Heusler alloys with 50\% concentration of $p$-block elements (anti-Heusler) have been identified, although none of such reported compounds belong to the VEC 24 category. Here, we report a new anti-Heusler alloy, Al$_2$MnCu, that undergoes long-range ferromagnetic (FM) ordering with $T_{\rm C}\sim$315 K and a large magnetic moment of $\sim$1.8 $μ_B$/f.u. despite having VEC 24. A phenomenological model based on molecular orbital hybridization is also proposed to understand the magnetism and unusual deviation from the standard S-P rule. |
| title | Al$_2$MnCu: A magnetically ordered member of the Heusler alloy family despite having a valence electron count of 24 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.09574 |