Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce$_2$RhIn$_8$
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| Format: | Preprint |
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2025
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| _version_ | 1866912378696761344 |
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| author | Klein, T. Marcenat, C. Demuer, A. Sarrade, J. Aoki, D. Sheikin, I. |
| author_facet | Klein, T. Marcenat, C. Demuer, A. Sarrade, J. Aoki, D. Sheikin, I. |
| contents | The antiferromagnetic heavy-fermion compound Ce$_2$RhIn$_8$ belongs to the same family and bears similarities with the well-studied prototypical material CeRhIn$_5$, which demonstrates a unique behavior under applied magnetic field. Here, we report specific-heat measurements on a high-quality single crystal of Ce$_2$RhIn$_8$ in magnetic fields up to 35 T applied along both principal crystallographic directions. When the magnetic field is applied along the $a$ axis of the tetragonal crystal structure, two additional field-induced antiferromagnetic phases are observed, in agreement with previous reports. One of them is confined in a small area of the field-temperature phase diagram. The other one, which develops above $\sim$2.5 T, is very robust against the field. Its transition temperature increases with field, reaches a maximum at $\sim$12 T, and then starts to decrease. However, it tends to saturate towards the highest field of our measurements. For a field applied along the $c$ axis, the Néel temperature, $T_N$, initially decreases with field, as expected for a typical antiferromagnet. Surprisingly, an additional phase emerges above $\sim$10 T. It is most likely to be of the same origin as its counterpart observed above 2.5 T for the other field orientation. This phase is also unusually robust: Its transition temperature increases all the way up to 35 T, where it exceeds the zero field $T_N =$~2.85 K. Finally, for both field directions, the phase diagrams contain rarely observed tricritical points of second-order phase transitions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_04238 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce$_2$RhIn$_8$ Klein, T. Marcenat, C. Demuer, A. Sarrade, J. Aoki, D. Sheikin, I. Strongly Correlated Electrons The antiferromagnetic heavy-fermion compound Ce$_2$RhIn$_8$ belongs to the same family and bears similarities with the well-studied prototypical material CeRhIn$_5$, which demonstrates a unique behavior under applied magnetic field. Here, we report specific-heat measurements on a high-quality single crystal of Ce$_2$RhIn$_8$ in magnetic fields up to 35 T applied along both principal crystallographic directions. When the magnetic field is applied along the $a$ axis of the tetragonal crystal structure, two additional field-induced antiferromagnetic phases are observed, in agreement with previous reports. One of them is confined in a small area of the field-temperature phase diagram. The other one, which develops above $\sim$2.5 T, is very robust against the field. Its transition temperature increases with field, reaches a maximum at $\sim$12 T, and then starts to decrease. However, it tends to saturate towards the highest field of our measurements. For a field applied along the $c$ axis, the Néel temperature, $T_N$, initially decreases with field, as expected for a typical antiferromagnet. Surprisingly, an additional phase emerges above $\sim$10 T. It is most likely to be of the same origin as its counterpart observed above 2.5 T for the other field orientation. This phase is also unusually robust: Its transition temperature increases all the way up to 35 T, where it exceeds the zero field $T_N =$~2.85 K. Finally, for both field directions, the phase diagrams contain rarely observed tricritical points of second-order phase transitions. |
| title | Exotic magnetic phase diagram and extremely robust antiferromagnetism in Ce$_2$RhIn$_8$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.04238 |