Coexistence of two different Cr ions by self-doping in half-metallic CrO2 nanorods

Jeong Hyun Shim; Soonchil Lee; Joonghoe Dho; Do Hyung Kim

doi:10.1103/PhysRevLett.99.057209

Coexistence of two different Cr ions by self-doping in half-metallic CrO2 nanorods

Jeong Hyun Shim, Soonchil Lee, Joonghoe Dho, Do Hyung Kim

Department of Physics

Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

We investigated the physical properties of Cr ions in half-metallic CrO2 using Cr53 nuclear magnetic resonance (NMR). The Cr53 NMR spectra showed two peaks with a similar intensity instead of the single peak anticipated from a uniform single valence Cr+4. Both Cr peaks exhibited a strong anisotropy in the hyperfine field and similar values in the enhancement factor and T2 relaxation time. These results suggest the coexistence of two different Cr ions (provisionally, Cr+4±1/3) by a self-doping effect, which is a likely origin of the metallic ferromagnetism in CrO2.

Original language	English
Article number	057209
Journal	Physical Review Letters
Volume	99
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.99.057209
State	Published - 2 Aug 2007

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10.1103/PhysRevLett.99.057209

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title = "Coexistence of two different Cr ions by self-doping in half-metallic CrO2 nanorods",

abstract = "We investigated the physical properties of Cr ions in half-metallic CrO2 using Cr53 nuclear magnetic resonance (NMR). The Cr53 NMR spectra showed two peaks with a similar intensity instead of the single peak anticipated from a uniform single valence Cr+4. Both Cr peaks exhibited a strong anisotropy in the hyperfine field and similar values in the enhancement factor and T2 relaxation time. These results suggest the coexistence of two different Cr ions (provisionally, Cr+4±1/3) by a self-doping effect, which is a likely origin of the metallic ferromagnetism in CrO2.",

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AU - Shim, Jeong Hyun

AU - Lee, Soonchil

AU - Dho, Joonghoe

AU - Kim, Do Hyung

PY - 2007/8/2

Y1 - 2007/8/2

N2 - We investigated the physical properties of Cr ions in half-metallic CrO2 using Cr53 nuclear magnetic resonance (NMR). The Cr53 NMR spectra showed two peaks with a similar intensity instead of the single peak anticipated from a uniform single valence Cr+4. Both Cr peaks exhibited a strong anisotropy in the hyperfine field and similar values in the enhancement factor and T2 relaxation time. These results suggest the coexistence of two different Cr ions (provisionally, Cr+4±1/3) by a self-doping effect, which is a likely origin of the metallic ferromagnetism in CrO2.

AB - We investigated the physical properties of Cr ions in half-metallic CrO2 using Cr53 nuclear magnetic resonance (NMR). The Cr53 NMR spectra showed two peaks with a similar intensity instead of the single peak anticipated from a uniform single valence Cr+4. Both Cr peaks exhibited a strong anisotropy in the hyperfine field and similar values in the enhancement factor and T2 relaxation time. These results suggest the coexistence of two different Cr ions (provisionally, Cr+4±1/3) by a self-doping effect, which is a likely origin of the metallic ferromagnetism in CrO2.

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JO - Physical Review Letters

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Coexistence of two different Cr ions by self-doping in half-metallic CrO2 nanorods

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