Magnetism and transport properties of metamagnetic Mn1−Cr Au2

Nagata, Y.; Hagii, Toshiharu; Samata, H.; Uchida, Takayuki; Abe, Susumu; Sung, Chung Fan; Lan, M. D.

doi:10.1016/s0925-8388(98)00938-4

Cited by 9 publications

(30 citation statements)

References 16 publications

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“…Measurements of the saturation magnetization at low temperatures (T ≤ 10 K) and at room temperature [35,36], along with measurements of the susceptibility and the critical magnetic field H c [35], show a very weak dependence on temperature. As discussed in Sec.…”

Section: Dft Results and Discussionmentioning

confidence: 99%

Collapse and control of theMnAu2spin-spiral state through pressure and doping

Glasbrenner

2016

Phys. Rev. B

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MnAu2 is a spin-spiral material with in-plane ferromagnetic Mn layers that form a screw-type pattern around a tetragonal c axis. The spiral angle θ was shown using neutron diffraction experiments to decrease with pressure, and in later studies it was found to suffer a collapse to a ferromagnetic state above a critical pressure, although the two separate experiments did not agree on whether this phase transition is first or second order. To resolve this contradiction, we use density functional theory calculations to investigate the spiral state as a function of pressure, charge doping, and also electronic correlations via a Hubbard-like U . We fit the results to the one-dimensional J1−J2−J3−J4 Heisenberg model, which predicts either a first-or second-order spiral-to-ferromagnetic phase transition for different regions of parameter space. At ambient pressure, MnAu2 sits close in parameter space to a dividing line separating first-and second-order transitions, and a combination of pressure and electron doping shifts the system from the first-order region into the second-order region. Our findings demonstrate that the contradiction in pressure experiments regarding the kind of phase transition are likely due to variations in sample quality. Our results also suggest that MnAu2 is amenable to engineering via chemical doping and to controlling θ using pressure and gate voltages, which holds potential for integration in spintronic devices.

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Section: Dft Results and Discussionmentioning

confidence: 99%

Collapse and control of theMnAu2spin-spiral state through pressure and doping

Glasbrenner

2016

Phys. Rev. B

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“…The T N , H th , and the helical angle of the helical-spin configuration all decrease as the Cr content x increases [3]. The lattice constants a (=b) and c of MnAu 2 is 3.387 and 8.810Å, respectively, and decrease as the Cr contents increase [4]. Significant giant magnetoresistance was also observed simultaneously with the metamagnetic transition [4].…”

Section: Introductionmentioning

confidence: 93%

“…Preparation and characterization of polycrystalline Mn 1−x Cr x Au 2 samples were reported previously [3,4]. The samples have almost the same Cr compositions as the nominal ones and the distribution of all the elements is homogeneous in the specimen as determined by the electron-probe microanalysis [4].…”

Section: Experiments and Theorymentioning

confidence: 99%

“…The lattice constants a (=b) and c of MnAu 2 is 3.387 and 8.810Å, respectively, and decrease as the Cr contents increase [4]. Significant giant magnetoresistance was also observed simultaneously with the metamagnetic transition [4]. The purpose of this work is to study, both experimentally and theoretically, XANES and EXAFS spectra around Au L 3 , Mn K, and Cr K absorption edges in order to probe the angular-momentum-resolved unoccupied states and bonding properties of these compounds.…”

Section: Introductionmentioning

confidence: 98%

“…These compounds, which crystallize in the body-centered tetragonal structure, exhibit many interesting physical properties [1][2][3][4]. The MnAu 2 shows a metamagnetic transition from a spiral to a ferromagnetic structure below the Neel temperature (T N ) of 365 K and above the threshold magnetic field (H th ) of about 10 kOe at 300 K [3].…”

Section: Introductionmentioning

confidence: 99%

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