Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

N. N. Kovaleva; K. I. Kugel; A. V. Bazhenov; T. N. Fursova; W. Löser; Y. Xu; G. Behr; F. V. Kusmartsev

doi:10.1038/srep00890

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

N. N. Kovaleva, K. I. Kugel, A. V. Bazhenov, T. N. Fursova, W. Löser, Y. Xu, G. Behr, F. V. Kusmartsev

Physics

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13 Scopus citations

Abstract

Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb₂ PdSi ₃. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low-and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.

Original language	British English
Article number	890
Journal	Scientific Reports
Volume	2
DOIs	https://doi.org/10.1038/srep00890
State	Published - 2012

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@article{66d193ccbc87467aa619daaaa37d2438,

title = "Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study",

abstract = "Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb2 PdSi 3. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low-and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.",

author = "Kovaleva, {N. N.} and Kugel, {K. I.} and Bazhenov, {A. V.} and Fursova, {T. N.} and W. L{\"o}ser and Y. Xu and G. Behr and Kusmartsev, {F. V.}",

note = "Funding Information: We acknowledge discussions with J. W. Allen, L. Boeri, A. V. Boris, A. Charnukha, O. V. Dolgov, D. V. Efremov, M. Frontzek, D. S. Inosov, G. Jackeli, E. Kotomin, I. Mazin, D. Proepper, and B. Keimer. We thank V. N. Antonov and A. N. Yaresko for the local-density-approximation calculations. We also thank E. V. Sampathkumaran for providing the resistivity data. This work was supported by the ESF network-program AQDJJ, the Royal Society of London (grant JP 090710), and the Russian Foundation for Basic Research (projects 10-02-92600-KO and 11-02-00708).",

year = "2012",

doi = "10.1038/srep00890",

language = "British English",

volume = "2",

journal = "Scientific Reports",

issn = "2045-2322",

publisher = "Nature Publishing Group",

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TY - JOUR

T1 - Formation of metallic magnetic clusters in a Kondo-lattice metal

T2 - Evidence from an optical study

AU - Kovaleva, N. N.

AU - Kugel, K. I.

AU - Bazhenov, A. V.

AU - Fursova, T. N.

AU - Löser, W.

AU - Xu, Y.

AU - Behr, G.

AU - Kusmartsev, F. V.

N1 - Funding Information: We acknowledge discussions with J. W. Allen, L. Boeri, A. V. Boris, A. Charnukha, O. V. Dolgov, D. V. Efremov, M. Frontzek, D. S. Inosov, G. Jackeli, E. Kotomin, I. Mazin, D. Proepper, and B. Keimer. We thank V. N. Antonov and A. N. Yaresko for the local-density-approximation calculations. We also thank E. V. Sampathkumaran for providing the resistivity data. This work was supported by the ESF network-program AQDJJ, the Royal Society of London (grant JP 090710), and the Russian Foundation for Basic Research (projects 10-02-92600-KO and 11-02-00708).

PY - 2012

Y1 - 2012

N2 - Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb2 PdSi 3. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low-and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.

AB - Magnetic materials are usually divided into two classes: those with localised magnetic moments, and those with itinerant charge carriers. We present a comprehensive experimental (spectroscopic ellipsomerty) and theoretical study to demonstrate that these two types of magnetism do not only coexist but complement each other in the Kondo-lattice metal, Tb2 PdSi 3. In this material the itinerant charge carriers interact with large localised magnetic moments of Tb(4f) states, forming complex magnetic lattices at low temperatures, which we associate with self-organisation of magnetic clusters. The formation of magnetic clusters results in low-energy optical spectral weight shifts, which correspond to opening of the pseudogap in the conduction band of the itinerant charge carriers and development of the low-and high-spin intersite electronic transitions. This phenomenon, driven by self-trapping of electrons by magnetic fluctuations, could be common in correlated metals, including besides Kondo-lattice metals, Fe-based and cuprate superconductors.

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ER -

Formation of metallic magnetic clusters in a Kondo-lattice metal: Evidence from an optical study

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