Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁
The magnetic properties of LaFeAsO₀.₈₅F₀.₁ compound were investigated by measurements of dc magnetization at different values of the magnetic field, H = 0.02, 1.0 and 2.0 T, in the temperature range 4.2–300 K. The superconducting behavior was found below 26 K, whereas a distinct peculiarity in the l...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2010 |
| ISSN: | 0132-6414 |
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| Sprache: | Englisch |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2010
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ / A.V. Fedorchenko, G.E. Grechnev, V.A. Desnenko, A.S. Panfilov, O.S. Volkova, A.N. Vasiliev // Физика низких температур. — 2010. — Т. 36, № 3. — С. 292-298. — Бібліогр.: 39 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862742000849125376 |
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| author | Fedorchenko, A.V. Grechnev, G.E. Desnenko, V.A. Panfilov, A.S. Volkova, O.S. Vasiliev, A.N. |
| author_facet | Fedorchenko, A.V. Grechnev, G.E. Desnenko, V.A. Panfilov, A.S. Volkova, O.S. Vasiliev, A.N. |
| citation_txt | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ / A.V. Fedorchenko, G.E. Grechnev, V.A. Desnenko, A.S. Panfilov, O.S. Volkova, A.N. Vasiliev // Физика низких температур. — 2010. — Т. 36, № 3. — С. 292-298. — Бібліогр.: 39 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The magnetic properties of LaFeAsO₀.₈₅F₀.₁ compound were investigated by measurements of dc magnetization at different values of the magnetic field, H = 0.02, 1.0 and 2.0 T, in the temperature range 4.2–300 K. The superconducting behavior was found below 26 K, whereas a distinct peculiarity in the low-field dependence of the magnetic susceptibility χ(T) was clearly observed at TM ≈ 135 K, which resembles a weak ferromagnetic (FM) response with saturation magnetic moment of about 10⁻⁴ μB per formula unit at 50 K. The transition at TM is presumably not governed by magnetic impurities but rather correlated with the antiferromagnetic (AFM) transition in the undoped LaFeAsO compound at about the same temperature. We suggest, that observed magnetic properties of the LaFeAsO₀.₈₅F₀.₁ sample are due to an interplay of FM and AFM transitions, and presumably related to an intrinsic feature of a small portion of the undoped LaFeAsO phase inherent in our sample. In order to shed light on the problem of magnetic instabilty of the LaFeAsO, the ab initio DFT calculations of electronic structure and paramagnetic susceptibility were performed within the local spin density approximation. It is shown, that a V-shaped peculiarity in the density of electronic states in a close vicinity of the Fermi level can govern magnetic properties of LaFeAsO under fluorine doping and/or oxygen deficiency.
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| first_indexed | 2025-12-07T20:23:00Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-116966 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T20:23:00Z |
| publishDate | 2010 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Fedorchenko, A.V. Grechnev, G.E. Desnenko, V.A. Panfilov, A.S. Volkova, O.S. Vasiliev, A.N. 2017-05-18T16:12:53Z 2017-05-18T16:12:53Z 2010 Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ / A.V. Fedorchenko, G.E. Grechnev, V.A. Desnenko, A.S. Panfilov, O.S. Volkova, A.N. Vasiliev // Физика низких температур. — 2010. — Т. 36, № 3. — С. 292-298. — Бібліогр.: 39 назв. — англ. 0132-6414 PACS: 71.20.–b, 74.25.Ha, 74.25.Jb, 75.30.Cr https://nasplib.isofts.kiev.ua/handle/123456789/116966 The magnetic properties of LaFeAsO₀.₈₅F₀.₁ compound were investigated by measurements of dc magnetization at different values of the magnetic field, H = 0.02, 1.0 and 2.0 T, in the temperature range 4.2–300 K. The superconducting behavior was found below 26 K, whereas a distinct peculiarity in the low-field dependence of the magnetic susceptibility χ(T) was clearly observed at TM ≈ 135 K, which resembles a weak ferromagnetic (FM) response with saturation magnetic moment of about 10⁻⁴ μB per formula unit at 50 K. The transition at TM is presumably not governed by magnetic impurities but rather correlated with the antiferromagnetic (AFM) transition in the undoped LaFeAsO compound at about the same temperature. We suggest, that observed magnetic properties of the LaFeAsO₀.₈₅F₀.₁ sample are due to an interplay of FM and AFM transitions, and presumably related to an intrinsic feature of a small portion of the undoped LaFeAsO phase inherent in our sample. In order to shed light on the problem of magnetic instabilty of the LaFeAsO, the ab initio DFT calculations of electronic structure and paramagnetic susceptibility were performed within the local spin density approximation. It is shown, that a V-shaped peculiarity in the density of electronic states in a close vicinity of the Fermi level can govern magnetic properties of LaFeAsO under fluorine doping and/or oxygen deficiency. The authors thank Drs. A. Beznosov and A. Grechnev for fruitful discussions and comments. This work has been supported by the Russian-Ukrainian RFBR-NASU project 8-2009. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Низкотемпеpатуpный магнетизм Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ Article published earlier |
| spellingShingle | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ Fedorchenko, A.V. Grechnev, G.E. Desnenko, V.A. Panfilov, A.S. Volkova, O.S. Vasiliev, A.N. Низкотемпеpатуpный магнетизм |
| title | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ |
| title_full | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ |
| title_fullStr | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ |
| title_full_unstemmed | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ |
| title_short | Magnetic properties and electronic structure of LaFeAsO₀.₈₅F₀.₁ |
| title_sort | magnetic properties and electronic structure of lafeaso₀.₈₅f₀.₁ |
| topic | Низкотемпеpатуpный магнетизм |
| topic_facet | Низкотемпеpатуpный магнетизм |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/116966 |
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