Magnetic phase transition in the itinerant helimagnet MnSi: Thermodynamic and transport properties

TitleMagnetic phase transition in the itinerant helimagnet MnSi: Thermodynamic and transport properties
Publication TypeJournal Article
Year of Publication2007
AuthorsStishov SM, Petrova AE, Khasanov S, Panova GK, Shikov AA, Lashley JC, Wu D, Lograsso TA
Journal TitlePhysical Review B
Volume76
Pages052405
Date PublishedAug
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000249155100012
Keywordspressure, weak ferromagnetism
Abstract

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 derivative 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. Striking mirror symmetry between the temperature derivative of resistivity and the thermal expansion coefficient is observed. Conclusions drawn from these experiments question prevailing views on the phase diagram of MnSi.

DOI10.1103/PhysRevB.76.052405
Alternate JournalPhys. Rev. B