Strong effects of thermally induced low-spin to high-spin crossover on transport properties of correlated metals

被引:0
|
作者
Moser, Johanna [1 ]
Mravlje, Jernej [2 ,3 ]
Aichhorn, Markus [1 ]
机构
[1] Graz Univ Technol, NAWI Graz, Inst Theoret & Computat Phys, Petersgasse 16, A-8010 Graz, Austria
[2] Jozef Stefan Inst, Jamova 39, Ljubljana SI-1000, Slovenia
[3] Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
关键词
ELECTRICAL-CONDUCTIVITY; QUANTUM; TRANSITIONS; BEHAVIOR; STATE;
D O I
10.1103/PhysRevB.111.085131
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We use dynamical mean-field theory to study how electronic transport in multiorbital metals is influenced by correlated (nominally) empty orbitals that are in proximity to the Fermi level. Specifically, we study 2 + 1 orbital and 3 + 2 orbital (i.e., t(2g) + e(g)) models on a Bethe lattice with a crystal field that is set so that the higher lying orbitals are nearly empty at low temperatures but get a non-negligible occupancy at elevated temperature. The high temperature regime is characterized by thermal activation of carriers leading to higher magnetic response (i.e., thermally induced low-spin to high-spin transition) and substantial influence on resistivity, where one can distinguish two counteracting effects: increased scattering due to formation of high spin and increased scattering phase space on one hand and additional parallel conduction channel on the other. The former effect is stronger and one may identify cases where resistivity increases by a factor of 3 at high temperatures even though the occupancy of the unoccupied band remains small (<10%). We discuss implications of our findings for transport properties of correlated materials.
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页数:9
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