Volume 103, Number 5, September 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||02 October 2013|
Manifestation of the spin textures in the thermopower of MnSi
1 Institut de Physique de la Matière Complexe, EPFL - CH-1015 Lausanne, Switzerland
2 Condensed Matter Physics and Materials Sciences Department, Brookhaven National Laboratory Upton, NY 11973, USA
3 University of Geneva - CH-1211 Geneva 4, Switzerland
Received: 6 May 2013
Accepted: 7 September 2013
To identify possible spin texture contributions to thermoelectric transport, we present a detailed temperature and pressure dependence of thermopower S in MnSi, as well as a low-temperature study of S in a magnetic field. We find that S/T reconstructs the phase diagram of MnSi encompassing the Fermi liquid, partially ordered, and non–Fermi-liquid phases. Our results indicate that the latter two phases have essentially the same nature. In the partially ordered phase, S(T) is strongly enhanced, which may be understood as a spiral-fluctuation–driven phase. A low-temperature upturn in S/T pertaining to the partial-order phase persists up to the highest pressure, 24 kbar. Contrarily, a small suppression of S(T) is observed in the ordered skyrmion lattice A phase.
PACS: 75.30.Kz – Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.) / 72.15.Jf – Thermoelectric and thermomagnetic effects / 75.50.-y – Studies of specific magnetic materials
© EPLA, 2013
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