تقرير
Fermi surface in KFe2As2 determined via de Haas-van Alphen oscillation measurements
| العنوان: | Fermi surface in KFe2As2 determined via de Haas-van Alphen oscillation measurements |
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| المؤلفون: | Terashima, Taichi, Kurita, Nobuyuki, Kimata, Motoi, Tomita, Megumi, Tsuchiya, Satoshi, Imai, Motoharu, Sato, Akira, Kihou, Kunihiro, Lee, Chul-Ho, Kito, Hijiri, Eisaki, Hiroshi, Iyo, Akira, Saito, Taku, Fukazawa, Hideto, Kohori, Yoh, Harima, Hisatomo, Uji, Shinya |
| المصدر: | Phys. Rev. B 87, 224512 (2013) |
| سنة النشر: | 2013 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We have completely determined the Fermi surface in KFe$_2$As$_2$ via de Haas-van Alphen (dHvA) measurements. Fundamental frequencies $\epsilon$, $\alpha$, $\zeta$, and $\beta$ are observed in KFe$_2$As$_2$. The first one is attributed to a hole cylinder near the X point of the Brillouin zone, while the others to hole cylinders at the $\Gamma$ point. We also observe magnetic breakdown frequencies between $\alpha$ and $\zeta$ and suggest a plausible explanation for them. The experimental frequencies show deviations from frequencies predicted by band structure calculations. Large effective masses up to 19 $m_e$ for $B \parallel c$ have been found, $m_e$ being the free electron mass. The carrier number and Sommerfeld coefficient of the specific heat are estimated to be 1.01 -- 1.03 holes per formula unit and 82 -- 94 mJmol$^{-1}$K$^{-2}$, respectively, which are consistent with the chemical stoichiometry and a direct measure of 93 mJmol$^{-1}$K$^{-2}$ [H. Fukazawa \textit{et al}., J. Phys. Soc. Jpn. \textbf{80SA}, SA118 (2011)]. The Sommerfeld coefficient is about 9 times enhanced over a band value, suggesting the importance of low-energy spin and/or orbital fluctuations, and places KFe$_2$As$_2$ among strongly correlated metals. We have also performed dHvA measurements on Ba$_{0.07}$K$_{0.93}$Fe$_2$As$_2$ and have observed the $\alpha$ and $\beta$ frequencies. Comment: 14 pages, 16 Figures, 3 Tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.87.224512 |
| URL الوصول: | http://arxiv.org/abs/1304.6469 |
| رقم الأكسشن: | edsarx.1304.6469 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.87.224512 |
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