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Title: Thermoelectricity in transition metal compounds: The role of spin disorder

Abstract

Here, at room temperature and above, most magnetic materials adopt a spin-disordered (paramagnetic) state whose electronic properties can differ significantly from their low-temperature, spin-ordered counterparts. Yet computational searches for new functional materials usually assume some type of magnetic order. In the present work, we demonstrate a methodology to incorporate spin disorder in computational searches and predict the electronic properties of the paramagnetic phase. We implement this method in a high-throughput framework to assess the potential for thermoelectric performance of 1350 transition-metal sulfides and find that all magnetic systems we identify as promising in the spin-ordered ground state cease to be promising in the paramagnetic phase due to disorder-induced deterioration of the charge carrier transport properties. We also identify promising non-magnetic candidates that do not suffer from these spin disorder effects. In addition to identifying promising materials, our results offer insights into the apparent scarcity of magnetic systems among known thermoelectrics and highlight the importance of including spin disorder in computational searches.

Authors:
 [1];  [1];  [1]
  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); NREL Laboratory Directed Research and Development (LDRD)
OSTI Identifier:
1334588
Report Number(s):
NREL/JA-5K00-67504
Journal ID: ISSN 1463-9076; PPCPFQ
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 18; Journal Issue: 46; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; spin disorder; paramagnetic state; thermoelectrics

Citation Formats

Gorai, Prashun, Toberer, Eric S., and Stevanović, Vladan. Thermoelectricity in transition metal compounds: The role of spin disorder. United States: N. p., 2016. Web. doi:10.1039/C6CP06943F.
Gorai, Prashun, Toberer, Eric S., & Stevanović, Vladan. Thermoelectricity in transition metal compounds: The role of spin disorder. United States. doi:10.1039/C6CP06943F.
Gorai, Prashun, Toberer, Eric S., and Stevanović, Vladan. Tue . "Thermoelectricity in transition metal compounds: The role of spin disorder". United States. doi:10.1039/C6CP06943F. https://www.osti.gov/servlets/purl/1334588.
@article{osti_1334588,
title = {Thermoelectricity in transition metal compounds: The role of spin disorder},
author = {Gorai, Prashun and Toberer, Eric S. and Stevanović, Vladan},
abstractNote = {Here, at room temperature and above, most magnetic materials adopt a spin-disordered (paramagnetic) state whose electronic properties can differ significantly from their low-temperature, spin-ordered counterparts. Yet computational searches for new functional materials usually assume some type of magnetic order. In the present work, we demonstrate a methodology to incorporate spin disorder in computational searches and predict the electronic properties of the paramagnetic phase. We implement this method in a high-throughput framework to assess the potential for thermoelectric performance of 1350 transition-metal sulfides and find that all magnetic systems we identify as promising in the spin-ordered ground state cease to be promising in the paramagnetic phase due to disorder-induced deterioration of the charge carrier transport properties. We also identify promising non-magnetic candidates that do not suffer from these spin disorder effects. In addition to identifying promising materials, our results offer insights into the apparent scarcity of magnetic systems among known thermoelectrics and highlight the importance of including spin disorder in computational searches.},
doi = {10.1039/C6CP06943F},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = 46,
volume = 18,
place = {United States},
year = {2016},
month = {11}
}

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Free Publicly Available Full Text
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Cited by: 3 works
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