Quantum Fluctuation-enhanced Milli-Kelvin Magnetic Refrigeration in Triangular Lattice Magnet GdBO3
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866912321249476608 |
|---|---|
| author | Lin, Weijie Zhao, Nan Li, Zhaoyi An, Weiran Guo, Ruixin Wang, Jianqiao Pan, Changzhao Wen, Bo Sheng, Jieming Wu, Liusuo Guo, Shu |
| author_facet | Lin, Weijie Zhao, Nan Li, Zhaoyi An, Weiran Guo, Ruixin Wang, Jianqiao Pan, Changzhao Wen, Bo Sheng, Jieming Wu, Liusuo Guo, Shu |
| contents | Rare-earth-based triangular lattice antiferromagnets, with strong quantum fluctuations and weak magnetic interactions, can often retain large magnetic entropy down to very low temperatures, making them excellent candidates for magnetic refrigeration at ultra-low temperatures. These materials exhibit a substantial magnetocaloric effect (MCE) due to enhanced spin fluctuations, particularly near quantum critical points, which leads to significant changes in magnetic entropy. This study reports on the crystal growth, structure, magnetism, and MCE of a Gd-based triangular lattice material, GdBO3, characterized by a large spin quantum number (S = 7/2). Successive phase transitions (T1 = 0.52 K, T2 = 0.88 K, and T3 = 1.77 K) were observed in zero-field specific heat measurements. Furthermore, thermal dynamic analysis under external magnetic fields identified five distinct phase regions and three quantum critical points for GdBO3. Due to its broad specific heat features and the high density of magnetic Gd3+ ions, we achieved a minimum temperature of 50 mK near the field-induced quantum critical point, using a custom-designed GdBO3-based adiabatic demagnetization refrigerator. Our findings reveal significant quantum fluctuations below 2 K, demonstrating GdBO3's potential for milli-Kelvin magnetic cooling applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08636 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum Fluctuation-enhanced Milli-Kelvin Magnetic Refrigeration in Triangular Lattice Magnet GdBO3 Lin, Weijie Zhao, Nan Li, Zhaoyi An, Weiran Guo, Ruixin Wang, Jianqiao Pan, Changzhao Wen, Bo Sheng, Jieming Wu, Liusuo Guo, Shu Strongly Correlated Electrons Rare-earth-based triangular lattice antiferromagnets, with strong quantum fluctuations and weak magnetic interactions, can often retain large magnetic entropy down to very low temperatures, making them excellent candidates for magnetic refrigeration at ultra-low temperatures. These materials exhibit a substantial magnetocaloric effect (MCE) due to enhanced spin fluctuations, particularly near quantum critical points, which leads to significant changes in magnetic entropy. This study reports on the crystal growth, structure, magnetism, and MCE of a Gd-based triangular lattice material, GdBO3, characterized by a large spin quantum number (S = 7/2). Successive phase transitions (T1 = 0.52 K, T2 = 0.88 K, and T3 = 1.77 K) were observed in zero-field specific heat measurements. Furthermore, thermal dynamic analysis under external magnetic fields identified five distinct phase regions and three quantum critical points for GdBO3. Due to its broad specific heat features and the high density of magnetic Gd3+ ions, we achieved a minimum temperature of 50 mK near the field-induced quantum critical point, using a custom-designed GdBO3-based adiabatic demagnetization refrigerator. Our findings reveal significant quantum fluctuations below 2 K, demonstrating GdBO3's potential for milli-Kelvin magnetic cooling applications. |
| title | Quantum Fluctuation-enhanced Milli-Kelvin Magnetic Refrigeration in Triangular Lattice Magnet GdBO3 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.08636 |