Lost Heat Capacity and Entropy in the Helical Magnet MnSi

TitleLost Heat Capacity and Entropy in the Helical Magnet MnSi
Publication TypeJournal Article
Year of Publication2010
AuthorsStishov SM, Petrova AE, Shikov AA, Lograsso TA, Isaev EI, Johansson B, Daemen LL
Journal TitlePhysical Review Letters
Volume105
Pages236403
Date Published12/02
ISBN Number0031-9007
Accession NumberISI:000286734400008
Keywordsfege, itinerant ferromagnets, metals, phase-diagram, scattering, spin fluctuations, TRANSITIONS
Abstract

The heat capacity of MnSi at B = 0 and B = 4 T was measured in the temperature range 2.5-100 K. To analyze the data, calculations of the phonon spectrum and phonon density of states in MnSi were performed. The calculated phonon frequencies were confirmed by means of inelastic neutron scattering. The analysis of the data suggests the existence of negative contributions to the heat capacity and entropy of MnSi at T > T-c that may imply a specific ordering in the spin subsystem in the paramagnetic phase of MnSi.

URL<Go to ISI>://000286734400008
DOI10.1103/PhysRevLett.105.236403
Alternate JournalPhys Rev LettPhys Rev Lett