Spin entropy as the likely source of enhanced thermopower in Na(x)Co2O4

Nature
Yayu WangN P Ong

Abstract

In an electric field, the flow of electrons in a solid produces an entropy current in addition to the familiar charge current. This is the Peltier effect, and it underlies all thermoelectric refrigerators. The increased interest in thermoelectric cooling applications has led to a search for more efficient Peltier materials and to renewed theoretical investigation into how electron-electron interaction may enhance the thermopower of materials such as the transition-metal oxides. An important factor in this enhancement is the electronic spin entropy, which is predicted to dominate the entropy current. However, the crucial evidence for the spin-entropy term, namely its complete suppression in a longitudinal magnetic field, has not been reported until now. Here we report evidence for such suppression in the layered oxide Na(x)Co2O4, from thermopower and magnetization measurements in both longitudinal and transverse magnetic fields. The strong dependence of thermopower on magnetic field provides a rare, unambiguous example of how strong electron-electron interaction effects can qualitatively alter electronic behaviour in a solid. We discuss the implications of our finding--that spin-entropy dominates the enhancement of thermopower i...Continue Reading

Citations

Sep 12, 2013·ACS Applied Materials & Interfaces·Mahmut AksitRichard D Robinson
Nov 17, 2011·Journal of the American Chemical Society·Yong LiuHongmin Zhu
May 23, 2003·Nature·Cronin B Vining
Jun 13, 2006·Nature Materials·Minhyea LeeN P Ong
Dec 2, 2006·Nature Materials·Bernhard Keimer
Dec 17, 2009·The Australian and New Zealand Journal of Psychiatry·C Robert Cloninger
Feb 13, 2014·Accounts of Chemical Research·Chong XiaoYi Xie
Dec 3, 2008·The Review of Scientific Instruments·L S Sharath ChandraV Ganesan
Jun 14, 2014·Physical Chemistry Chemical Physics : PCCP·Janina MolendaJanusz Tobola
Sep 21, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Jian ZhouXijiao Huang
Oct 30, 2009·Angewandte Chemie·Joseph R SootsmanMercouri G Kanatzidis
Jan 13, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Tong ZhouColin Greaves
Jan 13, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Yanjie CuiHolger Kleinke
Nov 10, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·E A ZverevaA N Vasiliev
Aug 16, 2016·Physical Chemistry Chemical Physics : PCCP·Di WuJiaqing He
Apr 11, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jan M Tomczak
Aug 23, 2017·Physical Chemistry Chemical Physics : PCCP·M H N Assadi, H Katayama-Yoshida
Jan 26, 2008·Nature Materials·G Jeffrey Snyder, Eric S Toberer
Dec 17, 2004·Physical Review Letters·F L NingF C Chou
May 3, 2006·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Z P GuoL B Luo
Sep 20, 2006·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Tomohiro Ikeda, Masashige Onoda
Jan 10, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Devendra Singh NegiJán Rusz
Jan 31, 2018·Nature Communications·Y FujishiroY Tokura
May 20, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Wei-Hua WangLiang-Jian Zou
Aug 2, 2003·Nature·R E SchaakR J Cava
May 8, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Masashige Onoda, Tomohiro Ikeda
Dec 31, 2005·Physical Review Letters·R ScheibnerL W Molenkamp
Jun 29, 2006·Physical Review Letters·J MerinoM Dressel
Jul 10, 2019·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Ulises Acevedo SalasSylvie Hébert
Nov 27, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M Hussein, N Assadi
Nov 1, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Simone CasoloTruls Norby
Dec 9, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S HébertA Maignan
Jul 2, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Q QiaoR F Klie
Mar 12, 2016·Physical Review Letters·Stevan ArsenijevićNigel E Hussey
Mar 27, 2013·Materials·Sascha PopulohAnke Weidenkaff
Jun 29, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xixiao MaShiping Feng
May 3, 2019·Chemical Communications : Chem Comm·Antoine MaignanRaúl E Carbonio
Oct 13, 2007·Physical Review Letters·K MukaiT Ohzuku
Jul 2, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·H NěmecJ Buršík
Mar 7, 2020·Physical Review Letters·Yuan CaoPablo Jarillo-Herrero
Aug 11, 2018·Proceedings of the National Academy of Sciences of the United States of America·Dominik HusmannTilman Esslinger

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