Electronic thermoelectric power factor and metal-insulator transition in FeSb2

Abstract

We show that synthesis-induced Metal -Insulator transition (MIT) for electronic transport along the orthorombic c axis of FeSb${}_2$ single crystals has greatly enhanced electrical conductivity while keeping the thermopower at a relatively high level. By this means, the thermoelectric power factor is enhanced to a new record high S${}^2$$\sigma$ $\sim$ 8000 $\mu$WK${}^{-2}$cm${}^{-1}$ at 28 K. We find that the large thermopower in FeSb${}_2$ can be rationalized within the correlated electron model with two bands having large quasiparaticle disparity, whereas MIT is induced by subtle structural differences. The results in this work testify that correlated electrons can produce extreme power factor values.

arXiv comment7 pages, 6 figures

References in corpus (14)

• Continuous Quantum Phase Transitions
• Unusual behaviors in the transport properties of REFe${}_4$P${}_{12}$ (RE: La, Ce, Pr, and Nd)
• Anisotropy and large magnetoresistance in narrow gap semiconductor FeSb2
• Kondo Insulator description of spin state transition in FeSb2
• Thermopower of correlated semiconductors : application to FeAs2 and FeSb2
• Huge Thermoelectric Power Factor: FeSb2 versus FeAs2 and RuSb2
• Low-temperature magnetotransport of narrow-gap semiconductor FeSb2
• Optical investigation of the metal-insulator transition in $FeS{b}_2$
• The semiconductor-to-ferromagnetic-metal transition in FeSb2
• Giant Carrier Mobility in Single Crystals of FeSb2
• Strong electron correlations in FeSb2: An optical investigation and comparison with RuSb2
• Colossal Positive Magnetoresistance in a Doped Nearly Magnetic Semiconductor
• Evidence for electron-phonon interaction in Fe${}_{1-x}$M${}_x$Sb${}_2$ (M=Co, Cr) single crystals
• Quasi-one-dimensional magnons in an intermetallic marcasite

Cited by in corpus (19)

• Thermopower enhancement by encapsulating cerium in clathrate cages
• Thermoelectricity in correlated narrow-gap semiconductors
• Unified picture for the colossal thermopower compound FeSb${}_2$
• Highly Dispersive Electron Relaxation and Colossal Thermoelectricity in the Correlated Semiconductor FeSb${}_2$
• Universal thermopower of bad metals
• Vacancy defect control of colossal thermopower in FeSb2
• Unusual electronic and vibrational properties in the colossal thermopower material FeSb${}_2$
• Anisotropic Correlated Electronic Structure of Colossal Thermopower Marcasite FeSb${}_2$
• Low-Temperature Thermopower in CoSbS
• Giant enhancement of cryogenic thermopower by polar structural instability in the pressurized semimetal MoTe2
• Origin of the energy gap in the narrow-gap semiconductor FeSb2 revealed by high-pressure magnetotransport measurements
• Enhanced Thermoelectric Power and Electronic Correlations in RuSe${}_2$
• Polaronic transport and thermoelectricity in Fe${}_{1-x}$Co${}_x$Sb${}_2$S${}_4$ ($x$ = 0, 0.1, and 0.2)
• Large thermopower in the antiferromagnetic semiconductor BaMn${}_2$Bi${}_2$
• Ubiquity of Linear Resistivity at Intermediate Temperature in Bad Metals
• Giant thermoelectric power factor anisotropy in PtSb${}_{1.4}$Sn${}_{0.6}$
• Electronic transport and thermoelectricity in selenospinel Cu${}_{6-x}$Fe${}_{4+x}$Sn${}_{12}$Se${}_{32}$
• Origin of anomalous temperature dependence of Nernst effect in narrow-gap semiconductors
• Time-resolved measurement of Seebeck effect for superionic metals during structural phase transition