Metamagnetism

About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.

Colossal magnetoelastic effects at the phase transition of (La 0.6 Pr 0.4 ) 0.7 Ca 0.3 MnO 3

Abstract: (La${}_{0.6}$Pr${}_{0.4}$)${}_{0.7}$Ca${}_{0.3}$MnO${}_{3}$ was characterized by means of ultrasound velocity and attenuation to study the temperature and magnetic field dependence of the elastic constants and to gain an insight into the metamagnetic transition. The metal-insulator and ferromagnetic-paramagnetic transitions are reflected in the behavior of the elastic constants due to strong electron-phonon and spin-phonon interactions. A hysteresis in elastic behavior and metamagnetism hints toward first-order nature of the phase transition. A softening of bulk modulus at the ferromagnetic transition for magnetic fields ${\ensuremath{\mu}}_{0}Hg2$ T was attributed to a coupling between the lattice and spin fluctuations. This softening peaks at a certain temperature ${T}^{*}\ensuremath{\approx}215$ K and field ${\ensuremath{\mu}}_{0}{H}^{*}\ensuremath{\approx}4$ T, which could be an indication of a critical end point of the ferromagnetic transition.

On the itinerant electron metamagnetic transition in a C15-type Laves phase compound LuCo2

Abstract: A clear metamagnetic transition in C15-type Laves phase compounds Lu(Co1-xAlx)2 has been observed by magnetisation measurements in pulsed high fields up to 400 kOe at 4.2 K. The magnetic moment power Co atom after the transition and the critical field for x=0.06 are 0.74 mu B and 220 kOe, respectively. Analysing the concentration dependence of this metamagnetism, the authors have first estimated the moment and the critical field for LuCo2(x=0), both of which are larger than the recent theoretical values.

Unusual metamagnetism in CeIrIn5

Abstract: We report a high-field investigation (up to 45 T) of the metamagnetic transition in CeIrIn5 with resistivity and de Haas-van Alphen (dHvA) effect measurements in the temperature range of 0.03-1 K. As the magnetic field is increased the resistivity increases, reaches a maximum at the metamagnetic critical field, and falls precipitously for fields just above the transition, while the amplitude of all measurable dHvA frequencies are significantly attenuated near the metamagnetic critical field. However, the dHvA frequencies and cyclotron masses are not substantially altered by the transition. In the low-field state, the resistivity is observed to increase toward low temperatures in a singular fashion, a behavior that is rapidly suppressed above the transition. Instead, in the high-field state, the resistivity monotonically increases with temperature with a dependence that is more singular than the iconic Fermi-liquid, temperature-squared behavior. Both the damping of the dHvA amplitudes and the increased resistivity near the metamagnetic critical field indicate an increased scattering rate for charge carriers consistent with critical fluctuation scattering in proximity to a phase transition. The dHvA amplitudes do not uniformly recover above the critical field, with some holelike orbits being entirely suppressed at high fields. These changes, taken as a whole, suggest that the metamagnetic transition in CeIrIn5 is associated with the polarization and localization of the heaviest of quasiparticles on the holelike Fermi surface. © 2009 The American Physical Society.