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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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Journal ArticleDOI
01 Apr 1997
TL;DR: In this paper, it was shown that at low temperatures melt-spun and subsequently annealed ribbons with the nominal composition Dy/sub x/Cu/sub 100-x/ (x < 20) show a remarkable magnetoresistance ratio which is negative and isotropic.
Abstract: At low temperatures melt-spun and subsequently annealed ribbons with the nominal composition Dy/sub x/Cu/sub 100-x/ (x<20) show a remarkable magnetoresistance ratio which is negative and isotropic. This effect is caused by the cubic DyCu/sub 5/ phase with the AuBe/sub 5/-type structure. Below a critical temperature T/sub m//spl ap/7 K this phase is metamagnetic. Between T/sub m/ and T/sub c/=14.5 K it shows a spontaneous magnetization i.e. it is ferromagnetic. The hexagonal DyCu/sub 7/ phase (TbCu/sub 7/-type structure) is ferromagnetic with a Curie temperature of about 18 K. This 1:7 phase as well as the lamellar Cu/DyCu/sub 5/ microstructure caused by the eutectoid decomposition of DyCu/sub 7/ do not result in a large magnetoresistance of the ribbons.

5 citations

Journal ArticleDOI
TL;DR: In this article, the authors have synthesized the new YbMn6−yFeySn6 alloys and investigated their crystal and magnetic properties using X-ray diffraction and magnetization measurements.

5 citations

Journal ArticleDOI
01 Mar 2009
TL;DR: In this paper, a generalized mean-field theory of all the conventional electron-hole condensates CDW, SDW and FM taken on the same footing using an eight dimensional spinor formalism is presented.
Abstract: We present the results of a generalized mean-field theory of all the conventional electron-hole condensates CDW,SDW and FM taken on the same footing using an eight dimensional spinor formalism. We study in detail the influence of temperature, particle-hole symmetry and external magnetic fields on the interplay of these three order parameters. We show that particle-hole asymmetry implies the presence of either one or else all three order parameters. Considering all order parameters on the same footing we reveal novel phenomena in the presence of a magnetic field like field-induced density waves, single and double first order transitions to itinerant metamagnetism as well as negative colossal magnetoresistance. We argue that the coexistence of CDW, SDW and FM is a quite generic phenomenon that may be involved in a number of open problems of great interest like for example the CMR phenomenon in manganites [4], the metamagnetic transitions in bilayer ruthenites and in heavy fermion systems etc.

5 citations

Journal ArticleDOI

5 citations

Journal ArticleDOI
TL;DR: In this paper, the crystal structure and the magnetic and electronic transport properties of Ge doped LaCo10.5Si2.3 intermetallics have been investigated using powder x-ray diffraction and magnetic and electrical measurements.
Abstract: The crystal structure and the magnetic and electronic transport properties of Ge doped LaCo10.5Si2.5−xGex (x=0–0.3) intermetallics have been investigated using powder x-ray diffraction and magnetic and electrical measurements. According to the x-ray diffraction pattern analysis, Ge as a dopant decreases the stability of the cubic LaCo 1:13 phase and stabilizes the Si based La(Co,Si) 1:13 tetragonal phase. From the authors’ structural refinement, the authors found that Ge prefers to occupy the 16l(2) position in the tetragonal phase. LaCo10.5Si2.2Ge0.3 shows ferromagnetic order with a metamagnetic state around 350K. An anomaly in resistivity is observed at around 367K, which is associated with the metamagnetic transition. The resistivity follows ρ(T)=ρo+aTn rule in the temperature range of 4–400K with n=1.17(3) for the half metallic state and n=2 for the normal metallic state, respectively. This type of discontinuity can be interpreted as a crossover from a low temperature metamagnetic half metallic state to the normal ferromagnetic-metallic state.

5 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202249
202117
202015
201937
201837