High-pressure electrical and thermal properties in MnSi

Speaker: Dr Anna Kusmartseva (含羞草视频)

Title: High-pressure electrical and thermal properties in MnSi

Abstract: I will present my recent findings on the electrical and thermal transport in non-centrosymmetric, itinerant ferromanget MnSi in the pressure range 1 – 11GPa. MnSi is a well-established strongly correlated material, with unconventional magnetic and electrical properties at low temperatures. Most notable examples of these are the magnetic field induced topological skyrmion phase and the associated Non-Fermi Liquid behaviour at low temperatures. The ferromagnetic transition in this material is suppressed at a critical pressure Pc~1.46GPa. Present work explores the behaviour of the electrical and thermal transports in MnSi at pressures far above the critical pressure. The results show a new characteristic pressure scale Pc2~4GPa where subtle changes arise both in electrical and heat conduction. The data may be interpreted through subtle deformations in the Fermi surface, that could indicate a change in the skyrmion topology.

References:

[1] R.Ritz, M. Halder, M. Wagner, C. Franz, A. Bauer and C. Pfleiderer, Nature, 497, 231,2013

[2] C. Pfleiderer, D. Reznik, L. Pintschovius, H. v.Lohneysen, M. Garst and A. Rosch, Nature, 427, 227, 2004

[3] M.D. Koterlyn, O.I. Babych, G.M. Koterlyn, Journal of Alloys and Compounds, 325, 6-11, 2001

[4] P. Pedrazzini, D. Jaccard, G. Lapertot, J. Flouquet, Y. Inada, H. Kohara, Y. Onuki, Physica B, 378-380, 165-166, 2006