Crystal and magnetic structure of CoMnGe, CoFeGe, FeMnGe and NiFeGe

Szytuła, A.; Pȩdziwiatr, A.T.; Tomkowicz, Z.; Bażela, W.

doi:10.1016/0304-8853(81)90116-5

Cited by 110 publications

(74 citation statements)

References 15 publications

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“…9 These TWs originate because the value of T C M is much higher than that of T C A in MM 0 X alloys. 16,29,30 Within the TW, when the transformation occurs, the parent phase is still in the PM state while the martensite is already in the FM state. Thus, a PM-to-FM MT occurs with a large DM.…”

Section: -mentioning

confidence: 99%

“…17 In this alloyed system, the introduced Co atoms directly occupy the substituted Mn sites according to the atomic site-preference rule. 29,30 Assuming that Mn moments remain basically unchanged, a reasonable value of about 0.55 l B for the Co moment can be derived from the sample with x ¼ 0.2 (molecular moment ¼ 2.35 l B ). It is strongly suggested that over a similar, shortened interatomic distance, the exchange interaction between Co and Mn atoms is prone to be positive and to establish FM coupling, while that between Mn and Mn moments is prone to spiral AFM coupling, as illustrated in the insets of Fig.…”

Section: -mentioning

confidence: 99%

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Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window

Liu

Zhang

et al. 2013

Applied Physics Letters

109

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An effective scheme of isostructural alloying was applied to establish a Curie-temperature window in isostructural MnNiGe-CoNiGe system. With the simultaneous accomplishment of decreasing structural-transition temperature and converting antiferromagnetic martensite to ferromagnetic state, a 200 K Curie-temperature window was established between Curie temperatures of austenite and martensite phases. In the window, a first-order magnetostructural transition between paramagnetic austenite and ferromagnetic martensite occurs with a sharp jump in magnetization, showing a magnetic entropy change as large as -40 J kg -1 K -1 in a 50 kOe field change. This giant magnetocaloric effect enables Mn 1-x Co x NiGe to become a potential magnetic refrigerant.

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Section: -mentioning

confidence: 99%

Section: -mentioning

confidence: 99%

Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window

Liu

Zhang

et al. 2013

Applied Physics Letters

109

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“…Recently, the magnetic-field-induced shape memory effect based on the magnetostructural coupling has also been found in another type of materials 28 , the hexagonal ternary compounds with the Ni 2 In structure [29][30][31] . With the FMMTs in these materials, large magnetocaloric effects are also associated [32][33][34][35][36] .…”

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confidence: 99%

Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

et al. 2012

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The magnetostructural coupling between the structural and the magnetic transition has a crucial role in magnetoresponsive effects in a martensitic-transition system. A combination of various magnetoresponsive effects based on this coupling may facilitate the multifunctional applications of a host material. Here we demonstrate the feasibility of obtaining a stable magnetostructural coupling over a broad temperature window from 350 to 70 K, in combination with tunable magnetoresponsive effects, in mnniGe:Fe alloys. The alloy exhibits a magneticfield-induced martensitic transition from paramagnetic austenite to ferromagnetic martensite. The results indicate that stable magnetostructural coupling is accessible in hexagonal phasetransition systems to attain the magnetoresponsive effects with broad tunability.

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“…According to neutron diffraction studies, stoichiometric MnCoGe and FeCoGe both have a collinear magnetic structure in the basal plane, and behave as an isotropic ferromagnet below their respective Curie temperatures of T C $ 345 and 370 K. 13 MnCoGe has an orthorhombic TiNiSi-type structure in the ferromagnetically ordered state, but transforms to a hexagonal Ni 2 In-type structure in the paramagnetic (PM) state at about T M $ 650 K. However, FeCoGe crystallizes in a hexagonal phase which is stable in the entire temperature interval. Studies of isostructural MnNiGe-based systems indicate that an alternating sequence of Ni-Ge and Mn layers perpendicular to the c-axis is formed in its hexagonal phase.…”

Section: à2mentioning

confidence: 99%

Mn1-xFexCoGe: A strongly correlated metal in the proximity of a noncollinear ferromagnetic state

Samanta

Dubenko

Quetz

et al. 2013

Applied Physics Letters

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An unusually large Kadowaki–Woods ratio of A/γ2 ∼ 43 μΩ·cm·mol2·K2·J−2 has been observed for intermetallic Mn1-xFexCoGe compounds in the proximity of x = 0.2 where the magnetic state of itinerant electrons system changes. The ratio is approximately four times larger than observed for heavy fermion systems. The manifestation of the strong electron correlations can be realized from the anisotropic origin of the effect through the substantial reduction of interlayer transport of heavy quasiparticles with comparable mean-free path and interlayer spacing in the proximity of a noncollinear ferromagnetic state associated with a large density of states at the Fermi level.

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Crystal and magnetic structure of CoMnGe, CoFeGe, FeMnGe and NiFeGe

Cited by 110 publications

References 15 publications

Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window

Giant magnetocaloric effect in isostructural MnNiGe-CoNiGe system by establishing a Curie-temperature window

Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

Mn1-xFexCoGe: A strongly correlated metal in the proximity of a noncollinear ferromagnetic state

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