Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields
Spin crossover (SCO) complexes have been shown to exhibit giant mechanocaloric effects. Due to the change of magnetization at the spin crossover transition, they are also expected to show magnetocaloric effects. However, experimental studies on the magnetocaloric properties in SCOs are scarce. Here,...
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| Format: | Article |
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AIP Publishing LLC
2025-01-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0240927 |
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| author | Klara Lünser Catalina Salazar Mejía Tino Gottschall Kübra Gürpinar Orhan Atakol Eyüp Kavak Baris Emre Enric Stern-Taulats Lluís Mañosa |
| author_facet | Klara Lünser Catalina Salazar Mejía Tino Gottschall Kübra Gürpinar Orhan Atakol Eyüp Kavak Baris Emre Enric Stern-Taulats Lluís Mañosa |
| author_sort | Klara Lünser |
| collection | DOAJ |
| description | Spin crossover (SCO) complexes have been shown to exhibit giant mechanocaloric effects. Due to the change of magnetization at the spin crossover transition, they are also expected to show magnetocaloric effects. However, experimental studies on the magnetocaloric properties in SCOs are scarce. Here, we have studied the magnetocaloric response in the SCO complex [Fe(L)2](BF4)2, [L = 2,6-di(pyrazol-1-yl)pyridine] using pulsed magnetic fields. We show that applying a magnetic field can induce a partial transformation from the low spin to the high spin state. We directly measure the adiabatic temperature change of the transformation for different initial sample temperatures and magnetic fields and compare them with calculations using the Clausius–Clapeyron equation. While we found a large change in entropy of 70 J kg−1 K−1 at 50 T, the corresponding temperature change of 1.5 K is small due to the weak dependence of the transformation temperature on the magnetic field. Our study enhances the knowledge of caloric effects in SCO complexes, which so far have mainly focused on mechanocaloric studies. |
| format | Article |
| id | doaj-art-2960057d5ba14b4487baa260dc0d73af |
| institution | Kabale University |
| issn | 2166-532X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj-art-2960057d5ba14b4487baa260dc0d73af2025-02-03T16:42:31ZengAIP Publishing LLCAPL Materials2166-532X2025-01-01131011105011105-610.1063/5.0240927Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fieldsKlara Lünser0Catalina Salazar Mejía1Tino Gottschall2Kübra Gürpinar3Orhan Atakol4Eyüp Kavak5Baris Emre6Enric Stern-Taulats7Lluís Mañosa8Departament de Física de la Matèria Condensada, Facultat de Física. Universitat de Barcelona, Martí i Franquès, 1, Barcelona 08028, CataloniaDresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden 01328, GermanyDresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden 01328, GermanyDepartment of Chemistry, Faculty of Science. Ankara University, Ankara 06100, TürkiyeDepartment of Chemistry, Faculty of Science. Ankara University, Ankara 06100, TürkiyeDepartment of Engineering Physics, Faculty of Engineering. Ankara University, Ankara 06100, TürkiyeDepartment of Engineering Physics, Faculty of Engineering. Ankara University, Ankara 06100, TürkiyeDepartament de Física de la Matèria Condensada, Facultat de Física. Universitat de Barcelona, Martí i Franquès, 1, Barcelona 08028, CataloniaDepartament de Física de la Matèria Condensada, Facultat de Física. Universitat de Barcelona, Martí i Franquès, 1, Barcelona 08028, CataloniaSpin crossover (SCO) complexes have been shown to exhibit giant mechanocaloric effects. Due to the change of magnetization at the spin crossover transition, they are also expected to show magnetocaloric effects. However, experimental studies on the magnetocaloric properties in SCOs are scarce. Here, we have studied the magnetocaloric response in the SCO complex [Fe(L)2](BF4)2, [L = 2,6-di(pyrazol-1-yl)pyridine] using pulsed magnetic fields. We show that applying a magnetic field can induce a partial transformation from the low spin to the high spin state. We directly measure the adiabatic temperature change of the transformation for different initial sample temperatures and magnetic fields and compare them with calculations using the Clausius–Clapeyron equation. While we found a large change in entropy of 70 J kg−1 K−1 at 50 T, the corresponding temperature change of 1.5 K is small due to the weak dependence of the transformation temperature on the magnetic field. Our study enhances the knowledge of caloric effects in SCO complexes, which so far have mainly focused on mechanocaloric studies.http://dx.doi.org/10.1063/5.0240927 |
| spellingShingle | Klara Lünser Catalina Salazar Mejía Tino Gottschall Kübra Gürpinar Orhan Atakol Eyüp Kavak Baris Emre Enric Stern-Taulats Lluís Mañosa Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields APL Materials |
| title | Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields |
| title_full | Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields |
| title_fullStr | Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields |
| title_full_unstemmed | Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields |
| title_short | Magnetocaloric effects in the prototype spin crossover complex [Fe(L)2](BF4)2 in pulsed magnetic fields |
| title_sort | magnetocaloric effects in the prototype spin crossover complex fe l 2 bf4 2 in pulsed magnetic fields |
| url | http://dx.doi.org/10.1063/5.0240927 |
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