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Metamagnetism
About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.
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TL;DR: In this paper, the authors present a model to probe metamagnetic properties in systems with a variable number of interacting spins, and the model produces a different magnetic response for N particles when comparing to N n − 1 for small particles.
Abstract: We present a model to probe metamagnetic properties in systems with a variable number of interacting spins. Thermodynamic properties such as the magnetization per particle [Formula: see text], linear susceptibility [Formula: see text], and nonlinear susceptibilities [Formula: see text] and [Formula: see text] were calculated. The model produces a different magnetic response for N particles when comparing to N - 1 particles for small [Formula: see text]. For an even number of particles, the susceptibilities show maxima in their temperature dependence. An odd number produces an additional free spin response that dominates at low temperatures. This free spin response also produces a step in the field-dependent magnetization per particle at B = 0 for odd N. The magnetization shows N/2 steps at [Formula: see text] with integer n for even N and [Formula: see text] additional steps at [Formula: see text] with integer n for odd N. Small clusters respond with metamagnetism in an otherwise isotropic spin space, while the large clusters show no metamagnetism.
TL;DR: In this paper, a magnetic phase diagram T-H for the Ru-1212 system was proposed, which showed that the magnetic superconductor Ru-moments are suppressed by superconductivity and magnetism.
Abstract: The magnetic superconductor
Ru0.9Sr2YCu2.1O7.9 (Ru-1212Y) has been
investigated using neutron diffraction under variable temperature and magnetic field. With
the complementary information from magnetization measurements, we propose a magnetic phase
diagram T-H for the Ru-1212 system. Uniaxial
antiferromagnetic (AFM) order of 1.2μ
B
/Ru
atoms with moments parallel to the c-axis is found below the magnetic
transition temperature at ~140 K in the absence of magnetic field. In addition,
ferromagnetism (FM) in the ab-plane develops below ~120 K, but
is suppressed at lower temperature by superconducting correlations. Externally applied
magnetic fields cause Ru-moments to realign from the c-axis to the
ab-plane, i.e. along the ⟨1,1,0⟩ direction, and induce ferromagnetism
in the plane with ~1μ
B
at 60 kOe.
These observations of the weak ferromagnetism suppressed by superconductivity and the
field-induced metamagnetic transition between AFM and FM demonstrate not only competing
orders of superconductivity and magnetism, but also suggest a certain vortex dynamics
contributing to these magnetic transitions.
01 Jan 2010
TL;DR: In this article, the magnetism of solid solution Yi1−xLaxCo9Si4 between strongly enhanced Pauli paramagnetic LaCo 9Si4 and weakly ferromagnetic YCo 9 Si4 has been investigated.
Abstract: The magnetism of solid solution Yi1−xLaxCo9Si4 between strongly enhanced Pauli paramagnetic LaCo9Si4 and weakly ferromagnetic YCo9Si4 has been investigated. The Curie temperature TC in the ferromagnetic region and the metamagnetic transition field HM in the paramagnetic region change continuously against x and approach zero at the same composition x ≊ 0.15, suggesting the presence of a critical point from spontaneous to field-induced ferromagnetism.
TL;DR: In this article, the temperature-dependent magnetic susceptibility and electrical resistivity of the compounds Dy6−xYxAl3Si (x = 0, 3, and 5) is presented.
Abstract: Results of the studies on the temperature-dependent magnetic susceptibility and electrical resistivity of the compounds Dy6−xYxAl3Si ( x = 0 , 3, and 5) is presented in the work. AC magnetic susceptibility studies show three magnetic orderings at 110, 47.5 and 30 K for the compound Dy6Al3Si and the peak corresponding to the low temperature (30 K) shows frequency-dependent behavior varying from 30 K at 8 Hz to 31 K at 33 Hz, 32.6 K at 222 Hz and 33.6 K at 666 Hz. As the Dy site is substituted by non-magnetic Y3+ ion, the magnetic ordering temperature decreases. Pronounced anomalies are observed in the resistivity behavior of the compounds in the neighborhood of the magnetic ordering temperatures. Results reveal the presence of frustrated exchange interactions in the system. The results could be accounted to the unique crystal structure of the system having three different rare-earth sites with different magnetic environments.
TL;DR: In this paper, the high-field magnetization of NpRhGa5 with the tetragonal structure was measured and the sharp metamagnetic transition with a sharp step at 26.T in the field along the [1−0−0] direction at 4.2
Abstract: We have measured the high-field magnetization of NpRhGa5 with the tetragonal structure and found the sharp metamagnetic transition with a sharp step at 26 T in the field along the [1 0 0] direction at 4.2 K. The magnetization saturates above 38 T, with 0.43 μ B / Np . The H – T phase diagram was determined by the magnetization curves at various temperatures.