Mössbauer study of static and dynamic critical behavior in Fe

Kobeissi, M. A.

doi:10.1103/physrevb.24.2380

Cited by 40 publications

(6 citation statements)

References 52 publications

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“…[66] computes the critical exponents for a Heisenberg fluid by a canonical-ensemble simulation. Depending on the analysis method, they find 1/ν = 1.40(1), 1.31(1), β/ν = 0.54(2), 0.52 (1), and γ/ν = 1.90(3), 1.87 (3). Overall, all estimates are in substantial agreement with our MC+IHT results.…”

Section: Introductionsupporting

confidence: 83%

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Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Campostrini

Hasenbusch²,

Pelissetto³

et al. 2002

Phys. Rev. B

475

414

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We improve the theoretical estimates of the critical exponents for the threedimensional Heisenberg universality class. We find γ = 1.3960(9), ν = 0.7112(5), η = 0.0375(5), α = −0.1336(15), β = 0.3689(3), and δ = 4.783(3). We consider an improved lattice φ 4 Hamiltonian with suppressed leading scaling corrections. Our results are obtained by combining Monte Carlo simulations based on finite-size scaling methods and high-temperature expansions. The critical exponents are computed from high-temperature expansions specialized to the φ 4 improved model. By the same technique we determine the coefficients of the small-magnetization expansion of the equation of state. This expansion is extended analytically by means of approximate parametric representations, obtaining the equation of state in the whole critical region. We also determine a number of universal amplitude ratios.

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Section: Introductionsupporting

confidence: 83%

“…35(N + 2)3 3(N + 4)(N + 6)(N + 8)χ 10 χ 3The formulae relevant for the Heisenberg universality class are obtained setting N = 3.…”

mentioning

confidence: 99%

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Campostrini

Hasenbusch²,

Pelissetto³

et al. 2002

Phys. Rev. B

475

414

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“…Mossbauer transition temperatures THF, indicated by the detection of a magnetic hyperfine field, were determined using the thermal scanning method described by Kobeissi [24]. For alloys in the range 0.05 S x C 0.25 the sample results were obtained in a helium flow cryostat while those for the x = 0.325 sample were obtained in a heated insert within a liquid nitrogen bath.…”

Section: Mossbauer Measurementsmentioning

confidence: 99%

Mossbauer and magnetic susceptibility studies of the alloy series FeAl_1-xCu_x

Kobeissi¹,

Pankhurst²,

Suharan³

et al. 1990

J. Phys.: Condens. Matter

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“…We used two, namely the temperature dependence of the magnetization as obtained from the hyperfine field (HF) measurements on Sn atoms in Ni 2 MnSn 46 and that obtained from similar measurements on Fe-atoms in bcc-Fe. 47 From the reduced magnetization M/M 0 at a given reduced temperature T /T c we determine the ratio of parallel and antiparallel spins for the uDLM model, and associate the corresponding reduced resistivity ρ/ρ c with the reduced temperature T /T c . For a typical ferromagnetic↔paramagnetic transition the reduced magnetization curve close to T /T c =1 has a universal (system-independent) form.…”

Section: Temperature-dependent Resistivitymentioning

confidence: 99%

Magnetism of mixed quaternary Heusler alloys: (Ni,T)$_{2}$MnSn (T=Cu,Pd) as a case study

Bose,

Kudrnovský,

Drchal

et al. 2010

Preprint

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The electronic properties, exchange interactions, finite-temperature magnetism, and transport properties of random quaternary Heusler Ni2MnSn alloys doped with Cu-and Pd-atoms are studied theoretically by means of ab initio calculations over the entire range of dopant concentrations. While the magnetic moments are only weakly dependent on the alloy composition, the Curie temperatures exhibit strongly non-linear behavior with respect to Cu-doping in contrast with an almost linear concentration dependence in the case of Pd-doping. The present parameter-free theory agrees qualitatively and also reasonably well quantitatively with the available experimental results. An analysis of exchange interactions is provided for a deeper understanding of the problem. The dopant atoms perturb electronic structure close to the Fermi energy only weakly and the residual resistivity thus obeys a simple Nordheim rule. The dominating contribution to the temperature-dependent resistivity is due to thermodynamical fluctuations originating from the spin-disorder, which, according to our calculations, can be described successfully via the disordered local moments model. Results based on this model agree fairly well with the measured values of spin-disorder induced resistivity.

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Mössbauer study of static and dynamic critical behavior in Fe

Cited by 40 publications

References 52 publications

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Mossbauer and magnetic susceptibility studies of the alloy series FeAl_1-xCu_x

Magnetism of mixed quaternary Heusler alloys: (Ni,T)$_{2}$MnSn (T=Cu,Pd) as a case study

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Mössbauer study of static and dynamic critical behavior in Fe

Cited by 40 publications

References 52 publications

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Mossbauer and magnetic susceptibility studies of the alloy series FeAl1-xCux

Magnetism of mixed quaternary Heusler alloys: (Ni,T)$_{2}$MnSn (T=Cu,Pd) as a case study

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Mossbauer and magnetic susceptibility studies of the alloy series FeAl_1-xCu_x