Experimental study of the magnetic phase transition in the MnSi itinerant helimagnet |
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Authors: | S M Stishov A E Petrova S Khasanov G Kh Panova A A Shikov J C Lashley D Wu T A Lograsso |
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Institution: | (1) Institute for High Pressure Physics, Troitsk, Moscow oblast, 142190, Russia;(2) Institute of Solid State Physics, Chernogolovka, Moscow oblast, 142432, Russia;(3) Russian Research Center Kurchatov Institute, Moscow, 123182, Russia;(4) Los Alamos National Laboratory, Los Alamos, NM 87545, USA;(5) Ames Laboratory, Iowa State University, Ames, IA 50011, USA |
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Abstract: | Magnetic susceptibility, heat capacity, thermal expansion, and resistivity of a high-quality single crystal of MnSi were carefully
studied at ambient pressure. The calculated change in magnetic entropy in the temperature range 0–30 K is less than 0.1R, a low value that emphasizes the itinerant nature of magnetism in MnSi. A linear temperature term dominates the behavior
of the thermal expansion coefficient in the range 30–150 K, which correlates to a large enhancement of the linear electronic
term in the heat capacity. A surprising similarity between variation of the heat capacity, the thermal expansion coefficient,
and the temperature derivative of resistivity through the phase transition in MnSi is observed. Specific forms of the heat
capacity, thermal expansion coefficient, and temperature derivative of resistivity at the phase transition to a helical magnetic
state near 29 K are interpreted as a combination of sharp first-order features and broad peaks or shallow valleys of yet unknown
origin. The appearance of these broad satellites probably hints at a frustrated magnetic state in MnSi slightly above the
transition temperature. Present experimental findings bring the current views on the phase diagram of MnSi into question.
The text was submitted by the authors in English. |
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