Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2

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

doi:10.1103/PhysRevB.94.014431

Title: Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator ${EuMn}_{2} {As}_{2}$

Abstract

Here, we report magnetic susceptibility χ, isothermal magnetization M, heat capacity C_p, and electrical resistivity ρ measurements on undoped EuMn₂As₂ and K-doped Eu_0.96K_0.04Mn₂As₂ and Eu_0.93K_0.07Mn₂As₂ 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 T_N1=15 K from C_p(T) and χ(T) data with a likely spin-reorientation transition at T_N2=5.0 K. The Mn⁺² 3d⁵ spins-5/2 exhibit AFM ordering at T_N=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 Eu_0.96K_0.04Mn₂As₂ is sufficient to induce a metallic ground state. We found evidence 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 Eu_0.96K_0.04Mn₂As₂ and Eu_0.93K_0.07Mn₂As₂, an anomalous S-shape T dependence of ρ related to the Mn magnetism is found. Upon cooling from 200 K, ρ exhibits a strong negative curvature, reachesmore »« less

Authors:

Anand, V. K. ^[1]; Johnston, D. C. ^[2]

Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Helmholtz-Zentrum Berlin for Materials and Energy, Berlin (Germany)
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

Publication Date:: Fri Jul 22 00:00:00 EDT 2016

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1326910

Alternate Identifier(s):: OSTI ID: 1268449

Report Number(s):: IS-J-9042
Journal ID: ISSN 2469-9950; PRBMDO

Grant/Contract Number:: AC02-07CH11358

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 94; Journal Issue: 1; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Anand, V. K., and Johnston, D. C. Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevB.94.014431.

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                    Anand, V. K., & Johnston, D. C. Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2.  United States.  https://doi.org/10.1103/PhysRevB.94.014431

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                    Anand, V. K., and Johnston, D. C. Fri .  
"Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2".  United States.  https://doi.org/10.1103/PhysRevB.94.014431.  https://www.osti.gov/servlets/purl/1326910.

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@article{osti_1326910,

  title        = {Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn2As2},

  author       = {Anand, V. K. and Johnston, D. C.},

  abstractNote = {Here, 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 3d5 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. We found evidence 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 S-shape 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. Finally, 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.},

  doi          = {10.1103/PhysRevB.94.014431},

  journal      = {Physical Review B},

  number       = 1,

  volume       = 94,

  place        = {United States},

  year         = {Fri Jul 22 00:00:00 EDT 2016},

  month        = {Fri Jul 22 00:00:00 EDT 2016}

}

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DOI: 10.1515/znb-1977-0706

AB2X2 - Verbindungen im CaAl2Si2-Typ, VII [1] Zur Struktur der Verbindungen SrZn2As2, SrCd2As2 und YbMnCuP2 / AB2X2 Compounds with the CaAl2Si2 Structure, VII [1] The Crystal Structure of SrZn2As2, SrCd2As2, and YbMnCuP2
journal, August 1980

Mewis, Albrecht
Zeitschrift für Naturforschung B, Vol. 35, Issue 8
DOI: 10.1515/znb-1980-0801

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Title: Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator EuMn 2 As 2

Abstract

Citation Formats

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Title: Metallic behavior induced by potassium doping of the trigonal antiferromagnetic insulator ${EuMn}_{2} {As}_{2}$

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