Berry-Phase Effect in Anomalous Thermoelectric Transport

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Di Xiao,¹ Yugui Yao,² Zhong Fang,² and Qian Niu¹
¹Department of Physics, The University of Texas, Austin, Texas 78712, USA
²Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100080, China

Received 24 April 2006; published 14 July 2006

Wedevelop a theory of the Berry-phase effect in anomalous transportin ferromagnets driven by statistical forces such as the gradientof temperature or chemical potential. Here a charge Hall currentarises from the Berry-phase correction to the orbital magnetization ratherthan from the anomalous velocity, which does not exist inthe absence of a mechanical force. A finite-temperature formula forthe orbital magnetization is derived, which enables us to providean explicit expression for the off-diagonal thermoelectric conductivity, to establishthe Mott relation between the anomalous Nernst and Hall effects,and to reaffirm the Onsager relations between reciprocal thermoelectric conductivities.A first-principles evaluation of our expression is carried out forthe material CuCr₂Se_4-xBr_x, obtaining quantitative agreement with a recent experiment.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.026603
DOI:	10.1103/PhysRevLett.97.026603
PACS:	72.15.Jf; 75.20.-g; 75.47.-m 72.15.Jf Thermoelectric and thermomagnetic effects (metals/alloys) 75.20.-g Diamagnetism, paramagnetism, and superparamagnetism 75.47.-m Magnetotransport phenomena; materials for magnetotransport YEAR: 2006

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