Pressure Collapse of the Magnetic Ordering in MnSi via Thermal Expansion - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




Pressure Collapse of the Magnetic Ordering in MnSi via Thermal Expansion - Condensed Matter > Strongly Correlated Electrons - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The itinerant quasi-ferromagnetic metal MnSi has been studied by detailedthermal expansion measurements under pressures and magnetic fields. A suddendecrease of the volume at the critical pressure Pc ~1.6 GPa has been observedand is in good agreement with the pressure variation of the volume fraction ofthe spiral magnetic ordering. This confirms that the magnetic order disappearsby a first order phase transition. The energy change estimated by the volumediscontinuity on crossing Pc is of similar order as the Zeeman energy of thetransition from the spiral ground state to a polarized paramagnetic one undermagnetic field. In contrast to the strong pressure dependence of the transitiontemperature, the characteristic fields are weakly pressure dependent,indicating that the strength of the ferromagnetic and the Dzyaloshinskii-Moriyainteractions do not change drastically around Pc. The evaluated results of thethermal expansion coefficient and the magnetostriction are analyzedthermodynamically. The Sommerfeld coefficient of the linear temperature term ofthe specific heat is enhanced just below Pc. The magnetic field-temperaturephase diagrams in the ordered and paramagnetic phases are also compared.Comparison is made with other heavy fermion compounds with first order phasetransition at 0 K.



Autor: Atsushi Miyake, Alain Villaume, Yoshinori Haga, Georg Knebel, Bernard Salce, Gerard Lapertot, Jacques Flouquet

Fuente: https://arxiv.org/



DESCARGAR PDF




Documentos relacionados