Orbital Kondo effect in V-doped1T-CrSe2
| Autor: | Matías Núñez, Daniele C. Freitas, Frédérique Gay, Jacques Marcus, Pierre Strobel, Armando A. Aligia, Manuel Núñez-Regueiro |
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| Rok vydání: | 2013 |
| Předmět: |
Physics
Wannier function Condensed matter physics Electronic structure Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Electronic Optical and Magnetic Materials Impurity 0103 physical sciences Atom Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Density functional theory Kondo effect 010306 general physics Spin (physics) |
| Zdroj: | Physical Review B. 88 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.88.245129 |
| Popis: | We have studied the resistance of $1T$-CrSe${}_{2}$, as the Cr atoms are substituted by V or Ti. The V replacement leads to a logarithmic increase in the resistance as the temperature is lowered, proportional to the V concentration. While this behavior is consistent with the Kondo effect, the weak dependence of the resistance with magnetic field and the fact that the system has antiferromagnetic order, rule out a Kondo effect due to spin degeneracy. In contrast to the case of V, Ti substitution does not increase the logarithmic term while application of pressure destroys it. Calculations of the electronic structure within the framework of density functional theory, maximally localized Wannier functions, and many-body calculations in a cluster containing a Cr or V atom and its six nearest-neighbor Se atoms, helped to reveal the existence of an orbital Kondo effect due to orbital degeneracy in the V substitutional impurities. |
| Databáze: | OpenAIRE |
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