Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements
Thermodynamic picture induced by <i>π</i>-<i>d</i> interaction in a molecular magnetic superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br), where BETS is bis(ethylen...
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MDPI AG
2019-01-01
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| author | Shuhei Fukuoka Sotarou Fukuchi Hiroki Akutsu Atsushi Kawamoto Yasuhiro Nakazawa |
| author_facet | Shuhei Fukuoka Sotarou Fukuchi Hiroki Akutsu Atsushi Kawamoto Yasuhiro Nakazawa |
| author_sort | Shuhei Fukuoka |
| collection | DOAJ |
| description | Thermodynamic picture induced by <i>π</i>-<i>d</i> interaction in a molecular magnetic superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br), where BETS is bis(ethylenedithio)tetraselenafulvalene, studied by single crystal calorimetry is reviewed. Although the <i>S</i> = 5/2 spins of Fe<sup>3+</sup> in the anion layers form a three-dimensional long-range ordering with nearly full entropy of <i>R</i>ln6, a broad hump structure appears in the temperature dependence of the magnetic heat capacity only when the magnetic field is applied parallel to the <i>a</i> axis, which is considered as the magnetic easy axis. The scaling of the temperature dependence of the magnetic heat capacity of the two salts is possible using the parameter of |<i>J</i><sub>dd</sub>|/<i>k</i><sub>B</sub> and therefore the origin of the hump structure is related to the direct magnetic interaction, <i>J</i><sub>dd</sub>, that is dominant in the system. Quite unusual crossover from a three-dimensional ordering to a one-dimensional magnet occurs when magnetic fields are applied parallel to the <i>a</i> axis. A notable anisotropic field-direction dependence against the in-plane magnetic field was also observed in the transition temperature of the bulk superconductivity by the angle-resolved heat capacity measurements. We discuss the origin of this in-plane anisotropy in terms of the 3<i>d</i> electron spin configuration change induced by magnetic fields. |
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| language | English |
| last_indexed | 2024-04-11T13:09:15Z |
| publishDate | 2019-01-01 |
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| record_format | Article |
| series | Crystals |
| spelling | doaj.art-780afc8f528f4beeb3485dabe5dc29542022-12-22T04:22:37ZengMDPI AGCrystals2073-43522019-01-01926610.3390/cryst9020066cryst9020066Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity MeasurementsShuhei Fukuoka0Sotarou Fukuchi1Hiroki Akutsu2Atsushi Kawamoto3Yasuhiro Nakazawa4Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Kita-ku Sapporo, Hokkaido 060-0810, JapanDepartment of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanDepartment of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanDepartment of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Kita-ku Sapporo, Hokkaido 060-0810, JapanDepartment of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, JapanThermodynamic picture induced by <i>π</i>-<i>d</i> interaction in a molecular magnetic superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br), where BETS is bis(ethylenedithio)tetraselenafulvalene, studied by single crystal calorimetry is reviewed. Although the <i>S</i> = 5/2 spins of Fe<sup>3+</sup> in the anion layers form a three-dimensional long-range ordering with nearly full entropy of <i>R</i>ln6, a broad hump structure appears in the temperature dependence of the magnetic heat capacity only when the magnetic field is applied parallel to the <i>a</i> axis, which is considered as the magnetic easy axis. The scaling of the temperature dependence of the magnetic heat capacity of the two salts is possible using the parameter of |<i>J</i><sub>dd</sub>|/<i>k</i><sub>B</sub> and therefore the origin of the hump structure is related to the direct magnetic interaction, <i>J</i><sub>dd</sub>, that is dominant in the system. Quite unusual crossover from a three-dimensional ordering to a one-dimensional magnet occurs when magnetic fields are applied parallel to the <i>a</i> axis. A notable anisotropic field-direction dependence against the in-plane magnetic field was also observed in the transition temperature of the bulk superconductivity by the angle-resolved heat capacity measurements. We discuss the origin of this in-plane anisotropy in terms of the 3<i>d</i> electron spin configuration change induced by magnetic fields.https://www.mdpi.com/2073-4352/9/2/66<i>π</i>-<i>d</i> systemthermodynamic measurementsuperconductivityantiferromagnetismsingle crystal heat capacity measurementmagnetic conductor |
| spellingShingle | Shuhei Fukuoka Sotarou Fukuchi Hiroki Akutsu Atsushi Kawamoto Yasuhiro Nakazawa Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements Crystals <i>π</i>-<i>d</i> system thermodynamic measurement superconductivity antiferromagnetism single crystal heat capacity measurement magnetic conductor |
| title | Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements |
| title_full | Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements |
| title_fullStr | Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements |
| title_full_unstemmed | Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements |
| title_short | Magnetic and Electronic Properties of <i>π</i>-<i>d</i> Interacting Molecular Magnetic Superconductor <i>κ</i>-(BETS)<sub>2</sub>Fe<i>X</i><sub>4</sub> (<i>X</i> = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements |
| title_sort | magnetic and electronic properties of i π i i d i interacting molecular magnetic superconductor i κ i bets sub 2 sub fe i x i sub 4 sub i x i cl br studied by angle resolved heat capacity measurements |
| topic | <i>π</i>-<i>d</i> system thermodynamic measurement superconductivity antiferromagnetism single crystal heat capacity measurement magnetic conductor |
| url | https://www.mdpi.com/2073-4352/9/2/66 |
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