Charge dynamics in the half-metallic ferromagnet CrO_2

by: EJ Singley, CP Weber, DN Basov, A Barry, JMD Coey

Physical Review B, Vol. 60, No. 6. (1999), 4126.

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Abstract

Infrared spectroscopy is used to investigate the electronic structure and charge carrier relaxation in crystalline films of CrO 2 which is the simplest of all half-metallic ferromagnets. Chromium dioxide is a bad metal at room temperature but it has a remarkably low residual resistivity ( < 5 μΩ cm) despite the small spectral weight associated with free carrier absorption. The infrared measurements show that low residual resistivity is due to the collapse of the scattering rate at ω < 2000 cm -1 . The blocking of the relaxation channels at low ω and T can be attributed to the unique electronic structure of a half-metallic ferromagnet. In contrast to other ferromagnetic oxides; the intraband spectral weight is constant below the Curie temperature.

@article{citeulike:1869407, abstract = {Infrared spectroscopy is used to investigate the electronic structure and charge carrier relaxation in crystalline films of CrO 2 which is the simplest of all half-metallic ferromagnets. Chromium dioxide is a bad metal at room temperature but it has a remarkably low residual resistivity ( < 5 μΩ cm) despite the small spectral weight associated with free carrier absorption. The infrared measurements show that low residual resistivity is due to the collapse of the scattering rate at ω < 2000 cm -1 . The blocking of the relaxation channels at low ω and T can be attributed to the unique electronic structure of a half-metallic ferromagnet. In contrast to other ferromagnetic oxides; the intraband spectral weight is constant below the Curie temperature.}, author = {Singley, E. J. and Weber, C. P. and Basov, D. N. and Barry, A. and Coey, J. M. D. }, citeulike-article-id = {1869407}, doi = {10.1103/PhysRevB.60.4126}, journal = {Physical Review B}, keywords = {charge, chromium, cro2, dioxide, ferromagnetic, metal, optical, reflectivity}, number = {6}, pages = {4126+}, posted-at = {2007-11-05 18:07:40}, priority = {2}, publisher = {American Physical Society}, title = {Charge dynamics in the half-metallic ferromagnet CrO\_{2}}, url = {http://dx.doi.org/10.1103/PhysRevB.60.4126}, volume = {60}, year = {1999} }

RIS record

TY - JOUR ID - citeulike:1869407 L3 - citeulike-article-id:1869407 TI - Charge dynamics in the half-metallic ferromagnet CrO_{2} JF - Physical Review B VL - 60 IS - 6 SP - 4126 PB - American Physical Society N2 - Infrared spectroscopy is used to investigate the electronic structure and charge carrier relaxation in crystalline films of CrO 2 which is the simplest of all half-metallic ferromagnets. Chromium dioxide is a bad metal at room temperature but it has a remarkably low residual resistivity ( < 5 μΩ cm) despite the small spectral weight associated with free carrier absorption. The infrared measurements show that low residual resistivity is due to the collapse of the scattering rate at ω < 2000 cm -1 . The blocking of the relaxation channels at low ω and T can be attributed to the unique electronic structure of a half-metallic ferromagnet. In contrast to other ferromagnetic oxides; the intraband spectral weight is constant below the Curie temperature. KW - charge KW - chromium KW - cro2 KW - dioxide KW - ferromagnetic KW - metal KW - optical KW - reflectivity AU - Singley, EJ AU - Weber, CP AU - Basov, DN AU - Barry, A AU - Coey, JMD PY - 1999//01/ UR - http://dx.doi.org/10.1103/PhysRevB.60.4126 ER -

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