Transport and magnetic properties of Cr-, Fe-, Cu-doped topological insulators

Y. H. Choi; N. H. Jo; K. J. Lee; J. B. Yoon; C. Y. You; M. H. Jung

doi:10.1063/1.3549553

Transport and magnetic properties of Cr-, Fe-, Cu-doped topological insulators

Y. H. Choi
, N. H. Jo
, K. J. Lee
, J. B. Yoon
, C. Y. You
, M. H. Jung

Department of Physics and Chemistry

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

83 Scopus citations

Abstract

We report a new class of three-dimensional topological insulators of transition metal doped Bi₂Se₃, Tr_xBi ₂Se_3, and Bi_2-xTr_xSe₃ (Tr Cr, Fe, Cu) with x 0.15, for the intercalation and substitution cases. With varying the doping atoms, a great variety of properties are observed in a single crystal form. The Cu-intercalated crystal shows superconducting behavior below 3 K, where the diamagnetic signal is found. The increase of carrier density at low temperature is likely to be responsible for the superconductivity. The magnetically doped case of the Fe-substituted Bi₂Se₃ exhibits dominance of ferromagnetic interactions, whereas the Cr-substituted Bi₂Se₃ favors antiferromagnetic interactions. From these results, we learn that the peculiar transport and magnetic properties of topological insulator Bi₂Se₃ are easily tunable by chemical doping elements, which change the Fermi energy and manipulate the charge carriers.

Original language	English
Article number	07E312
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3549553
State	Published - 1 Apr 2011

Bibliographical note

Funding Information:
This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (KRF-2010-0005427) and by IT R&D program of MKE/KEIT (2009-F-004-01, STT-MRAM).

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title = "Transport and magnetic properties of Cr-, Fe-, Cu-doped topological insulators",

abstract = "We report a new class of three-dimensional topological insulators of transition metal doped Bi2Se3, TrxBi 2Se3, and Bi2-xTrxSe3 (Tr Cr, Fe, Cu) with x 0.15, for the intercalation and substitution cases. With varying the doping atoms, a great variety of properties are observed in a single crystal form. The Cu-intercalated crystal shows superconducting behavior below 3 K, where the diamagnetic signal is found. The increase of carrier density at low temperature is likely to be responsible for the superconductivity. The magnetically doped case of the Fe-substituted Bi2Se3 exhibits dominance of ferromagnetic interactions, whereas the Cr-substituted Bi2Se3 favors antiferromagnetic interactions. From these results, we learn that the peculiar transport and magnetic properties of topological insulator Bi2Se3 are easily tunable by chemical doping elements, which change the Fermi energy and manipulate the charge carriers.",

author = "Choi, \{Y. H.\} and Jo, \{N. H.\} and Lee, \{K. J.\} and Yoon, \{J. B.\} and You, \{C. Y.\} and Jung, \{M. H.\}",

note = "Funding Information: This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (KRF-2010-0005427) and by IT R\&D program of MKE/KEIT (2009-F-004-01, STT-MRAM).",

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doi = "10.1063/1.3549553",

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T1 - Transport and magnetic properties of Cr-, Fe-, Cu-doped topological insulators

AU - Choi, Y. H.

AU - Jo, N. H.

AU - Lee, K. J.

AU - Yoon, J. B.

AU - You, C. Y.

AU - Jung, M. H.

N1 - Funding Information: This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (KRF-2010-0005427) and by IT R&D program of MKE/KEIT (2009-F-004-01, STT-MRAM).

PY - 2011/4/1

Y1 - 2011/4/1

N2 - We report a new class of three-dimensional topological insulators of transition metal doped Bi2Se3, TrxBi 2Se3, and Bi2-xTrxSe3 (Tr Cr, Fe, Cu) with x 0.15, for the intercalation and substitution cases. With varying the doping atoms, a great variety of properties are observed in a single crystal form. The Cu-intercalated crystal shows superconducting behavior below 3 K, where the diamagnetic signal is found. The increase of carrier density at low temperature is likely to be responsible for the superconductivity. The magnetically doped case of the Fe-substituted Bi2Se3 exhibits dominance of ferromagnetic interactions, whereas the Cr-substituted Bi2Se3 favors antiferromagnetic interactions. From these results, we learn that the peculiar transport and magnetic properties of topological insulator Bi2Se3 are easily tunable by chemical doping elements, which change the Fermi energy and manipulate the charge carriers.

AB - We report a new class of three-dimensional topological insulators of transition metal doped Bi2Se3, TrxBi 2Se3, and Bi2-xTrxSe3 (Tr Cr, Fe, Cu) with x 0.15, for the intercalation and substitution cases. With varying the doping atoms, a great variety of properties are observed in a single crystal form. The Cu-intercalated crystal shows superconducting behavior below 3 K, where the diamagnetic signal is found. The increase of carrier density at low temperature is likely to be responsible for the superconductivity. The magnetically doped case of the Fe-substituted Bi2Se3 exhibits dominance of ferromagnetic interactions, whereas the Cr-substituted Bi2Se3 favors antiferromagnetic interactions. From these results, we learn that the peculiar transport and magnetic properties of topological insulator Bi2Se3 are easily tunable by chemical doping elements, which change the Fermi energy and manipulate the charge carriers.

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SN - 0021-8979

VL - 109

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 7

M1 - 07E312

ER -

Transport and magnetic properties of Cr-, Fe-, Cu-doped topological insulators

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