On the nature of the phase transition in the itinerant helimagnet MnSi

Details On the nature of the phase transition in the itinerant helimagnet MnSi On the nature of the phase transition in the itinerant helimagnet MnSi

2007-02-20

arxiv.org/abs/cond-mat/0702460v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

A careful study of thermodynamic and transport properties of a high quality single crystal of MnSi at ambient pressure suggests that its transition to a helical magnetic state near 29 K is weakly first order. The heat capacity, temperature derivatives of resistivity, thermal expansion and magnetic susceptibility exhibit a specific structure around the phase transition point, interpreted as a combination of first and second order features. Conclusions drawn from these experiments question prevailing views on the phase diagram of MnSi and propose that the phase transition under study becomes second order at high pressure and low temperature.

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