Thermal properties and Ising critical behavior in EuFe 2 As 2

Oleaga, A.; Salazar, A.; Thamizhavel, A.; Dhar, S. K.

doi:10.1016/j.jallcom.2014.08.094

Cited by 10 publications

(7 citation statements)

References 33 publications

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“…1(f), we determine the magnetic transition temperature from the position of the specific-heat cusp, which does not show signs of a first-or second-order phase transition. This observation is in line with previously reported results on polycrystalline CsEuFe 4 As 4 EuFe 2 As 2 which show a singularity [16][17][18][19] . The variation of the specific heat in the vicinity of the phase transition, the specific heat can be expressed 20 as C = a ± |t| −α +b(t).…”

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confidence: 93%

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Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Willa

Bao

et al. 2019

Phys. Rev. B

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confidence: 93%

“…EuFe 2 As 2 which show a singularity [16][17][18][19] . The variation of the specific heat in the vicinity of the phase transition, the specific heat can be expressed 20 as C = a ± |t| −α +b(t).…”

Section: Fig 1 Entropy Change (C/t ) In Single Crystalmentioning

confidence: 99%

Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Willa

Bao

et al. 2019

Phys. Rev. B

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“…This observation is in agreement with previous reports on polycrystalline RbEuFe 4 As 4 [24] and CsEuFe 4 As 4 [25] samples, where it has been attributed to a 3rd order phase transition. It is however in contrast to EuFe 2 As 2 , which shows typical singular behavior in the specific heat at the magnetic transition [8,13,[36][37][38].…”

Section: A Specific Heatmentioning

confidence: 99%

Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4

et al. 2018

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We investigate the anisotropic superconducting and magnetic properties of single-crystal RbEuFe4As4 using magnetotransport and magnetization measurements. We determine a magnetic ordering temperature of the Eu-moments of Tm = 15 K and a superconducting transition temperature of Tc = 36.8 K. The superconducting phase diagram is characterized by high upper critical field slopes of -70 kG/K and -42 kG/K for in-plane and out-of-plane fields, respectively, and a surprisingly low superconducting anisotropy of Γ = 1.7. Ginzburg-Landau parameters of κc ∼ 67 and κ ab ∼ 108 indicate extreme type-II behavior. These superconducting properties are in line with those commonly seen in optimally doped Fe-based superconductors. In contrast, Eu-magnetism is quasi-two dimensional as evidenced by highly anisotropic in-plane and out-of-plane exchange constants of 0.6 K and < 0.04 K. A consequence of the quasi-2D nature of the Eu-magnetism are strong magnetic fluctuation effects, a large suppression of the magnetic ordering temperature as compared to the Curie-Weiss temperature, and a cusp-like anomaly in the specific heat devoid of any singularity. Magnetization curves reveal a clear magnetic easy-plane anisotropy with in-plane and out-of-plane saturation fields of 2 kG and 4 kG.

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“…The p character is largely contained in the states near the Fermi level [ 13 ]. EuFe 2 As 2 has unique characteristics, since the Eu 2+ ions have 4 f electrons and the combined spin of the electrons is 7/2 [ 14 ]. In this article, we present the elastic constants and phonon dispersion of the iron pnictide EuFe 2 As 2 as studied from first principles.…”

Section: Introductionmentioning

confidence: 99%

First Principle Study of the Mechanical Properties and Phonon Dispersion of the Iron Pnictide Compound EuFe₂As₂

Omboga

Otieno

Nyawere

2020

The Scientific World Journal

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We present results on the first principle study of the elastic constants and the phonon dispersion of EuFe2As2 at zero pressure. The ground-state energy calculations were performed within Density Functional Theory (DFT) and the generalized gradient approximation using the pseudopotential method with plane-wave basis sets. The projector augmented-wave (PAW) pseudopotentials were used in our calculation. The open source code QUANTUM ESPRESSSO was used with its pseudopotential database. The study on the elastic constants at zero pressure was a clear indication that the compound is mechanically stable, and the phonon dispersion study also indicated that the compound is dynamically stable. The elastic constants and mechanical properties also led to the conclusion that the compound is ductile and anisotropic.

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Thermal properties and Ising critical behavior in EuFe 2 As 2

Cited by 10 publications

References 33 publications

Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4

First Principle Study of the Mechanical Properties and Phonon Dispersion of the Iron Pnictide Compound EuFe₂As₂

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Thermal properties and Ising critical behavior in EuFe 2 As 2

Cited by 10 publications

References 33 publications

Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Strongly fluctuating moments in the high-temperature magnetic superconductor RbEuFe4As4

Anisotropic superconductivity and magnetism in single-crystal RbEuFe4As4

First Principle Study of the Mechanical Properties and Phonon Dispersion of the Iron Pnictide Compound EuFe2As2

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First Principle Study of the Mechanical Properties and Phonon Dispersion of the Iron Pnictide Compound EuFe₂As₂