Magnetic Phase Diagram of Hexagonal FeGe

Carrander, K; Schwartz, Herman; Beckman, O.

doi:10.1088/0031-8949/2/6/012

Cited by 8 publications

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References 5 publications

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“…According to neutron diffraction [l] and Mossbauer [2] experiments, hexagonal FeGe is an antiferromagnet with a Nee1 temperature TN =411 I 1 K. Thc spin magnetic moments associated with the iron atoms are directed along the c-axis such that moments within each basal plane are parallel, while those in adjacent planes are antiparallel. Magnetisation [3] and susceptibility [4] measurements and a Fermi surface estimate [5] provide evidence that below about 30 K the spin moments tilt away from the c-axis.…”

Section: Introductionmentioning

confidence: 91%

The Electrical Resistivity of Hexagonal FeGe Single Crystals

Stenström¹,

Sundström

Sagredo

1972

Phys. Scr.

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Electrical resistivity measurements have been carried out on hexagonal FeGe (B 35), which is a uniaxial antiferromagnet with TN=411 K. The resistivity parallel to the c-axis exhibits a hump below TN, which arises from the magnetic superzones cutting and distorting different contributions to the Fermi surface. For the current in the basal plane a mere change in slope is observed in the resistivity at the Néel temperature. Critical scattering, as well as imperfections, tend to smooth out the transition behaviour and an attempt is made to determine the critical exponent in dϱ/dT = Cε-λ, where ε = |T-TN|/TN. For current parallel to the c-axis λ ≈ 0.8 for T>TN and λ ≈ -0.4 for T

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Section: Introductionmentioning

confidence: 91%

The Electrical Resistivity of Hexagonal FeGe Single Crystals

Stenström¹,

Sundström

Sagredo

1972

Phys. Scr.

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Mössbauer Study of Hexagonal FeGe

et al. 1975

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Mössbauer spectroscopic studies of the hexagonal antiferromagnet FeGe have been undertaken in the temperature range 10-430 K. The temperature variation of the magnetic hyperfine field for iron deviates from Brillouin function behaviour. From the values of B hf close to the ordering temperature the critical exponent β=0.328 and the Neél temperature T N=398 K were obtained. The close similarity between isostructural binary compounds in the iron-germanium and the iron-tin systems as regards magnetic properties is stressed.

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Susceptibility Measurements and Magnetic Ordering of Hexagonal FeGe

et al. 1972

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The spin structure of the metallic hexagonal B 35 phase of FeGe has been studied by means of susceptibility and magnetization measurements. Below the Neel temperature TN = 411 K hexagonal FeGe is a uniaxial antiferromagnet with the spins parallel to the c-axis. In each c-plane all spins are ferromagnetically coupled with an exchange constant J0 ≈ 22 meV. The antiferromagnetic exchange constant between nearest neighbour and next nearest neighbour c-planes are J1 = -3.5 meV and J2 = -0.9 meV resp. in the molecular field model. Susceptibility and spin flop experiments indicate that the spins tilt away from the c-axis below 30 K. We suggest that the spins then form a double cone structure with a cone halfangle of 20° at 4.2 K. In the double cone the c-plane components have a turn angle in the vicinity of 180° between nearest neighbour planes, which implies absence of long range order. The result is in good agreement with Fermi surface calculations by Sundström (Physica Scripta, following paper), which show the existence of several spin density wave vectors between Q = 0.89 π/c and Q = 1.3 π/c calipering different parts of the Fermi surface in a direction parallel to the c-axis.

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Magnetic Phase Diagram of Hexagonal FeGe

Cited by 8 publications

References 5 publications

The Electrical Resistivity of Hexagonal FeGe Single Crystals

The Electrical Resistivity of Hexagonal FeGe Single Crystals

Mössbauer Study of Hexagonal FeGe

Susceptibility Measurements and Magnetic Ordering of Hexagonal FeGe

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