Topic
Metamagnetism
About: Metamagnetism is a research topic. Over the lifetime, 2023 publications have been published within this topic receiving 38108 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this article, the magnetic and transport properties of La0.7Sr0.3MnO3 (0.05 ⩽x⩽ 0.7), La 0.5Sr 0.3mn1−xFexO3 and La 0,7Pb0.
Abstract: In this work structure, magnetic and transport properties of La0.7−x BixCa0.3MnO3 (0.05⩽x⩽0.7), La0.7Pb0.3Mn1−xFexO3 and La0.7Sr0.3Mn1−xFexO3 (0⩽x⩽0.3) manganites have been studied. Competition between ferromagnetic and antiferromagnetic interactions has been observed giving rise to complex magnetic behaviour, including metamagnetism and spin glass features. Such features are interpreted as arising from the weakening of the double exchange mechanism, of ferromagnetic character, as a consequence of the substitutions. In the case of Bi substituted compounds the covalent character of Bi strongly localizes the hopping electron, while the Fe substitution destroys the double exchange mechanism by the change in energy levels of the Fe4+ ions with respect to the Mn4+ ones.
11 citations
TL;DR: The electrical resistivity of a single-crystalline whisker of UPdIn at 4.2 K was measured in magnetic fields up to 35 T applied along the c-axis of the hexagonal structure as discussed by the authors.
Abstract: The electrical resistivity of a single-crystalline whisker of UPdIn at 4.2 K was measured in magnetic fields up to 35 T applied along the c -axis of the hexagonal structure. The resistivity values become drastically suppressed in magnetic fields where the metamagnetic transitions appear on the magnetization curve. Taking into account these results, Fermi surface nesting due to the noncompensated antiferromagnetic structure with the propagation vector along the c -axis is suggested to be a source of the large values of the electrical resistivity in zero magnetic field.
11 citations
TL;DR: In this paper, the magnetocaloric effect (MCE) in UNiGa compound has been studied using the dc magnetization measurement technique and the maximum value of the magnetic entropy change - Δ S M, for Δ μ 0 H = 5 T, has been found to be 3.56 J kg − 1 K - 1 at ∼ 37.2 K with a relative cooling power of 22.5 J kg - 1.
Abstract: The magnetocaloric effect (MCE) in the UNiGa compound has been studied using the dc magnetization measurement technique. This system shows normal and inverse MCEs at low field around the paramagnetic to ferrimagnetic transition temperature (38.4 K), and the ferrimagnetic to antiferromagnetic transition temperature (34.5 K), respectively. At higher fields, the inverse MCE becomes very weak, which could be explained due to the presence of a field-induced metamagnetic phase transition. The maximum value of the magnetic entropy change - Δ S M , for Δ μ 0 H = 5 T , has been found to be 3.56 J kg - 1 K - 1 at ∼ 37.2 K with a relative cooling power of 22.5 J kg - 1 .
11 citations
TL;DR: In this paper, it was found that the polycrystalline NdRu2Ge2 undergoes two successive magnetic transitions at Tt and Tt = 10 and 19 kOe, respectively.
Abstract: It is found that the polycrystalline NdRu2Ge2 undergoes two successive magnetic transitions at Tt = 10 K and TN = 19 K. Evidence of metamagnetic transition is detected in the magnetization isotherm data in the antiferromagnetic regime. Temperature dependence of magnetoresistance (MR) shows that the relative magnitudes of MR at TN and Tt change considerably as the field is increased from 10 kOe to 30 kOe. Moreover, the MR is found to be positive below 9 K for 30 kOe field although the material is ferromagnetic at these temperatures. The highest value of negative MR near TN is about 42% in a field of 30 kOe, while the positive MR is about 35% at 3 K in a field of 50 kOe. Like MR, the magnetocaloric effect (MCE) at TN and Tt also shows anomalous behavior. The relative magnitudes of MCE at these temperatures are found to change with increase in field. It appears that the high field (>10 kOe) magnetic state below TN is complex, giving rise to some antiferromagnetic-like fluctuations, affecting the MR and MCE b...
11 citations
TL;DR: In this paper, a comparative analysis of the magnetization processes for Gd3Ni and gd3Co single-crystal compounds is presented and possible magnetic structures for both compounds are proposed and the features of the field-induced metamagnetic transitions are discussed on the basis of the possible magnetic structure.
11 citations