We present a time-resolved terahertz spectroscopic study of the half-metallic ferromagnet CrO2. The ultrafast conductivity dynamics excited by an optical pump displays very short (several picoseconds) and a very long (several hundred picoseconds) characteristic time scales. We attribute the former to the electron-phonon relaxation and the latter to the spin-lattice relaxation. We use this distinction to quantify the relative contribution of the scattering by spin fluctuations to the resistivity of CrO2: We find that they contribute less than one half of all scattering events below room temperature. This contribution rises to similar to 70% as the temperature approaches T-C = 390 K. The small effect of spin fluctuations on the resistivity is unexpected in light of the proposed double-exchange nature of the electronic and magnetic properties of CrO2.
机构:
Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Fujiwara, Hirokazu
Terashima, Kensei
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Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Terashima, Kensei
Sunagawa, Masanori
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Sunagawa, Masanori
Yano, Yuko
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Yano, Yuko
Nagayama, Takanobu
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Nagayama, Takanobu
Fukura, Tetsushi
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Fukura, Tetsushi
Yoshii, Fumiya
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Yoshii, Fumiya
Matsuura, Yuka
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Matsuura, Yuka
Ogata, Makoto
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Ogata, Makoto
Wakita, Takanori
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Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Wakita, Takanori
Yaji, Koichiro
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机构:
Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Yaji, Koichiro
Harasawa, Ayumi
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Harasawa, Ayumi
Kuroda, Kenta
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Kuroda, Kenta
Shin, Shik
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Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Shin, Shik
Horiba, Koji
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机构:
High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Photon Factory, 1-1 Oho, Tsukuba, Ibaraki 3050801, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Horiba, Koji
Kumigashira, Hiroshi
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机构:
High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Photon Factory, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan
Tohoku Univ, Dept Phys, Sendai, Miyagi 9808577, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Kumigashira, Hiroshi
Muraoka, Yuji
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机构:
Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Muraoka, Yuji
Yokoya, Takayoshi
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Okayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
Okayama Univ, Res Inst Interdisciplinary Sci, Okayama 7008530, JapanOkayama Univ, Grad Sch Nat Sci & Technol, Okayama 7008530, Japan
机构:
Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USAUniv Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
West, Kevin G.
Osofsky, Michael
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机构:
Naval Res Lab, Washington, DC 20375 USAUniv Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
Osofsky, Michael
Mazin, I. I.
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机构:
Naval Res Lab, Washington, DC 20375 USAUniv Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
Mazin, I. I.
Dao, Nam N. H.
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机构:
Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USAUniv Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
Dao, Nam N. H.
Wolf, Stuart A.
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机构:
Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
Univ Virginia, Dept Phys, Charlottesville, VA 22904 USAUniv Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA
Wolf, Stuart A.
Lu, Jiwei
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Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USAUniv Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA