Role of spin fluctuations in the conductivity of CrO2

被引:5
|
作者
Heffernan, Kate H. [1 ]
Yu, Shukai [1 ]
Deckoff-Jones, Skylar [1 ]
Zhang, Xueyu [2 ]
Gupta, Arunava [2 ]
Talbayev, D. [1 ]
机构
[1] Tulane Univ, Dept Phys & Engn, 6400 Freret St, New Orleans, LA 70118 USA
[2] Univ Alabama, Dept Chem, Box 870336, Tuscaloosa, AL 35487 USA
关键词
TRANSPORT-PROPERTIES; RELAXATION; ELECTRON; MAGNETORESISTANCE; MAGNETOTRANSPORT; SPECTROSCOPY; POLARIZATION; FERROMAGNET; DYNAMICS; FILMS;
D O I
10.1103/PhysRevB.93.165143
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页数:7
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