Antiferromagnetism in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>EuCu</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>As</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>EuCu</mml:mtext><mml:mrow><mml:mn>1.82</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>Sb</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystals

Anand, V. K.; Johnston, D. C.

doi:10.1103/physrevb.91.184403

Cited by 44 publications

(35 citation statements)

References 67 publications

(77 reference statements)

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“…As discussed in Refs. [26], this feature naturally arises due to an increased entropy in 2Sþ1-fold degenerated systems with large S. The magnetic entropy S mag ðTÞ ¼ Z T 0 C mag ðTÞ T dT in EuRhGe 3 is shown in the inset to Fig. 5.…”

Section: Heat Capacitymentioning

confidence: 97%

Strongly anisotropic and complex magnetic behavior in EuRhGe3

Bednarchuk

Kaczorowski

2015

Journal of Alloys and Compounds

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Section: Heat Capacitymentioning

confidence: 97%

Strongly anisotropic and complex magnetic behavior in EuRhGe3

Bednarchuk

Kaczorowski

2015

Journal of Alloys and Compounds

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“…Consequently, AFM ordering of the Eu sub-arXiv:1907.04813v1 [cond-mat.str-el] 10 Jul 2019 lattice gives way to ferromagnetic (FM) ordering with a Curie temperature T C = 125 K which arises from both Eu 4f and Co 3d moments [21,23]. EuCu 2 As 2 [24] and EuRh 2 As 2 [25] also have the ThCr 2 Si 2 -type structure and order antiferromagnetically at the Néel temperatures T N =17.5 K and 47 K, respectively. Superconductivity has been found in the Ni-based ThCr 2 Si 2 -type compounds SrNi 2 As 2 (T c = 0.62 K) [26], SrNi 2 P 2 (T c = 1.4 K) [27], BaNi 2 As 2 (T c = 0.7 K) [28], and BaNi 2 P 2 (T c = 2.80 K) [29].…”

Section: Introductionmentioning

confidence: 99%

Helical antiferromagnetic ordering in EuNi1.95As2 single crystals

et al. 2019

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The Eu +2 spins-7/2 in EuNi2As2 with the body-centered tetragonal ThCr2Si2 structure order antiferromagnetically below the Néel temperature TN = 15 K into a helical antiferromagnetic (AFM) structure with the helix axis aligned along the tetragonal c axis and the Eu ordered moments aligned ferromagnetically within the ab plane as previously reported from neutron diffraction measurements [T. Jin, et al., Phys. Rev. B 99, 014425 (2019)]. Here we study the crystallographic, magnetic, thermal, and electronic transport properties of Bi-flux-grown single crystals using single-crystal xray diffraction, anisotropic magnetic susceptibility χ, isothermal magnetization M , heat capacity C p , and electrical resistivity ρ measurements versus applied magnetic field H and temperature T . Vacancies are found on the Ni sites corresponding to the composition EuNi 1.95(1) As2. A good fit of the ρ(T ) data by the Bloch-Grüneisen theory for metals was obtained. The χ ab (T ) data below TN are fitted well by molecular field theory (MFT), and the helix turn angle kd and the Eu-Eu Heisenberg exchange constants are extracted from the fit parameters. The kd value is in good agreement with the neutron-diffraction result. The magnetic contribution to the zero-field heat capacity below TN is also fitted by MFT. The isothermal in-plane magnetization M ab exhibits two metamagnetic transitions versus H, whereas Mc(T = 2 K) is nearly linear up to H = 14 T, both behaviors being consistent with MFT. The Mc(H, T ), ρ(Hc, T ), and Cp(Hc, T ) data yielded a Hc-T phase diagram separating the AFM and paramagnetic phases in good agreement with MFT. Anisotropic χ(T ) literature data for the ThCr2Si2-type helical antiferromagnet EuRh2As2 were also fitted well by MFT. A comparison is made between the crystallographic and magnetic properties of ThCr2Si2-type EuM2P n2 compounds with M = Fe, Co, Ni, Cu, or Rh, and P n = P or As, where only ferromagnetic and c-axis helical AFM structures are found.

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“…Continuing our work on 122-type pnictides in the search for novel properties and ground states [24][25][26][27][28][29][30][31], here we report a comprehensive investigation of the physical properties of EuMn 2 As 2 which crystallizes in the trigonal CaAl 2 Si 2 -type structure (space group P3m1) [32]. This structure is quite different from the common body-centered tetragonal ThCr 2 Si 2 -type structure of 122 compounds [33].…”

Section: Introductionmentioning

confidence: 99%

Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulatorEuMn2As2

Anand

Johnston

2016

Phys. Rev. B

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We report magnetic susceptibility χ, isothermal magnetization M , heat capacity Cp and electrical resistivity ρ measurements on undoped EuMn2As2 and K-doped Eu0.96K0.04Mn2As2 and Eu0.93K0.07Mn2As2 single crystals with the trigonal CaAl2Si2-type structure as a function of temperature T and magnetic field H. EuMn2As2 has an insulating ground state with an activation energy of 52 meV and exhibits antiferromagnetic (AFM) ordering of the Eu +2 spins S = 7/2 at TN1 = 15 K from Cp(T ) and χ(T ) data with a likely spin-reorientation transition at TN2 = 5.0 K. The Mn +2 3d 5 spins-5/2 exhibit AFM ordering at TN = 142 K from all three types of measurements. The M (H) isotherm and χ(T ) data indicate that the Eu AFM structure is both noncollinear and noncoplanar. The AFM structure of the Mn spins is also unclear. A 4% substitution of K for Eu in Eu0.96K0.04Mn2As2 is sufficient to induce a metallic ground state. Evidence is found for a difference in the AFM structure of the Eu moments in the metallic crystals from that of undoped EuMn2As2 versus both T and H. For metallic Eu0.96K0.04Mn2As2 and Eu0.93K0.07Mn2As2, an anomalous Sshape T dependence of ρ related to the Mn magnetism is found. Upon cooling from 200 K, ρ exhibits a strong negative curvature, reaches maximum positive slope at the Mn TN ≈ 150 K, and then continues to decrease but more slowly below TN. This suggests that dynamic short-range AFM order of the Mn spins above the Mn TN strongly suppresses the resistivity, contrary to the conventional decrease of ρ that is only observed upon cooling below TN of an antiferromagnet.

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Antiferromagnetism inEuCu2As2andEuCu1.82Sb2single crystals

Cited by 44 publications

References 67 publications

Strongly anisotropic and complex magnetic behavior in EuRhGe3

Strongly anisotropic and complex magnetic behavior in EuRhGe3

Helical antiferromagnetic ordering in EuNi1.95As2 single crystals

Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulatorEuMn2As2

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