Insulator-to-metal transition and large thermoelectric effect in La${}_{1-x}$Sr${}_x$MnAsO

Abstract

We report the Sr substitution effect in an antiferromagnetic insulator LaMnAsO. The Sr doping limit is $x\sim$ 0.10 under the synthesis conditions, as revealed by x-ray diffractions indicate. Upon Sr doping, the room-temperature resistivity drops by five orders of magnitude down to $\sim$0.01 $\Omega \cdot$cm, and the temperature dependence of resistivity shows essentially metallic behavior for $x\ge$0.08. Hall and Seebeck measurements confirm consistently that the insulator-to-metal transition is due to hole doping. Strikingly, the room-temperature Seebeck coefficient for the metallic samples is as high as $\sim 240\mu$V/K, making the system as a possible candidate for thermoelectric applications.

5 pages, 4 figures

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Cited by in corpus (12)

• Short- and long-range magnetic order in LaMnAsO
• Persistence of local-moment antiferromagnetic order in Ba(1-x)KxMn2As2
• Novel weak-ferromagnetic metallic state in heavily doped Ba${}_{1-x}$K${}_x$Mn${}_2$As${}_2$
• Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single crystals
• Peculiar properties of Cr${}_3$As${}_3$-chain-based superconductors
• Importance of effective dimensionality in manganese pnictides
• First Principles Study of the Magnetic Properties of LaOMnAs
• The Electronic and Magnetic Properties of Magnetoresistant Nd1-xSrxMnAsO Oxyarsenides
• Thermopower of the electron-doped manganese pnictide LaMnAsO
• Spin Dynamics in the Antiferromagnetic Oxypnictides and Fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF
• Pressure induced antiferromagnetic-tetragonal to nonmagnetic-collapse-tetragonal insulator-metal transition in ThMnAsN
• Synthesis, structure and properties of layered phosphide nitrides $Ak$Th${}_2$Mn${}_4$P${}_4$N${}_2$ ($Ak$ = Rb, Cs)