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TT: Fachverband Tiefe Temperaturen

TT 20: Transport: Spincaloric Transport (jointly with MA)

TT 20.9: Vortrag

Montag, 11. März 2013, 17:15–17:30, H22

Altering the thermopower by magnetic fields — •Steven Achilles¹, Volodymyr V. Maslyuk², and Ingrid Mertig¹ — ¹Institute of Physics, Martin Luther University Halle-Wittenberg, D-06120 Halle, Germany — ²Institute of Electron Physics, National Academy of Sciences of Ukraine, 88017 Uzhgorod, Ukraine

Transport properties of nanocontacts are unusual and determined by quantum effects as soon as the characteristic diameter decreases towards the nanometer scale. Besides the investigation of transport properties under low temperature conditions, temperature induced transport becomes more and more important [1].

In this work, we present an ab-initio study of both conductance and thermopower in a non-collinear magnetic system. We focus on an organometallic vanadium-benzene (V₄Bz₅) molecule attached to two Co electrodes oriented in fcc (001) direction with non-collinear magnetic order. Such vanadium-benzene complexes were synthesized and remain stable up to room temperature [2].

We show that, besides the formation of a non-collinear magnetization through the molecule, the sign and magnitude of the thermopower can be addressed directly altering the orientation of the leads magnetization. Furthermore, a non-monotonous behavior of the thermopower as a function of angle between the lead magnetization directions is found [3].
Reddy et al., Science 315 (5818), 1568 (2007).
K. Miyajima et al., Eur. Phys. J. D 34, 177-182 (2005).
V. V. Maslyuk et al., submitted.