EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet

Sangeetha, N. S.; Cuervo-Reyes, Eduardo; Pandey, Abhishek; Johnston, D. C.

doi:10.1103/PhysRevB.94.014422

Title: EuCo₂P₂: A Model Molecular-Field Helical Heisenberg Antiferromagnet

Abstract

The metallic compound EuCo₂P₂ with the body-centered tetragonal ThCr₂Si₂ structure containing Eu spins-7/2 was previously shown from single-crystal neutron diffraction measurements to exhibit a helical antiferromagnetic (AFM) structure below T_N=66.5 K with the helix axis along the c axis and with the ordered moments aligned within the ab plane. Here we report crystallography, electrical resistivity, heat capacity, magnetization, and magnetic susceptibility measurements on single crystals of this compound. We demonstrate that EuCo₂P₂ is a model molecular-field helical Heisenberg antiferromagnet from comparisons of the anisotropic magnetic susceptibility χ, high-field magnetization, and magnetic heat capacity of EuCo₂P₂ single crystals at temperature T≤TN with the predictions of our recent formulation of molecular-field theory. Values of the Heisenberg exchange interactions between the Eu spins are derived from the data. The low-T magnetic heat capacity ~T³ arising from spin-wave excitations with no anisotropy gap is calculated and found to be comparable to the lattice heat capacity. The density of states at the Fermi energy of EuCo₂P₂ and the related compound BaCo₂P₂ are found from the heat capacity data to be large, 10 and 16 states/eV per formula unit for EuCo₂P₂ and BaCo₂P₂, respectively. These values are enhanced by a factor of ~2.5 above those foundmore »« less

Authors:

Sangeetha, N. S. ^[1]; Cuervo-Reyes, Eduardo ^[2]; Pandey, Abhishek ^[1]; Johnston, D. C. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Swiss Federal Lab. for Materials Science and Technology (Empa), Dubendorf (Switzerland); Federal Inst. of Technology, Zurich (Switzerland)

Publication Date:: Tue Jul 19 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:: 1311820

Alternate Identifier(s):: OSTI ID: 1264795

Report Number(s):: IS-J-8865
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


                    Sangeetha, N. S., Cuervo-Reyes, Eduardo, Pandey, Abhishek, and Johnston, D. C. EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevB.94.014422.

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                    Sangeetha, N. S., Cuervo-Reyes, Eduardo, Pandey, Abhishek, & Johnston, D. C. EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet.  United States.  https://doi.org/10.1103/PhysRevB.94.014422

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                    Sangeetha, N. S., Cuervo-Reyes, Eduardo, Pandey, Abhishek, and Johnston, D. C. Tue .  
"EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet".  United States.  https://doi.org/10.1103/PhysRevB.94.014422.  https://www.osti.gov/servlets/purl/1311820.

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@article{osti_1311820,

  title        = {EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet},

  author       = {Sangeetha, N. S. and Cuervo-Reyes, Eduardo and Pandey, Abhishek and Johnston, D. C.},

  abstractNote = {The metallic compound EuCo2P2 with the body-centered tetragonal ThCr2Si2 structure containing Eu spins-7/2 was previously shown from single-crystal neutron diffraction measurements to exhibit a helical antiferromagnetic (AFM) structure below TN=66.5 K with the helix axis along the c axis and with the ordered moments aligned within the ab plane. Here we report crystallography, electrical resistivity, heat capacity, magnetization, and magnetic susceptibility measurements on single crystals of this compound. We demonstrate that EuCo2P2 is a model molecular-field helical Heisenberg antiferromagnet from comparisons of the anisotropic magnetic susceptibility χ, high-field magnetization, and magnetic heat capacity of EuCo2P2 single crystals at temperature T≤TN with the predictions of our recent formulation of molecular-field theory. Values of the Heisenberg exchange interactions between the Eu spins are derived from the data. The low-T magnetic heat capacity ~T3 arising from spin-wave excitations with no anisotropy gap is calculated and found to be comparable to the lattice heat capacity. The density of states at the Fermi energy of EuCo2P2 and the related compound BaCo2P2 are found from the heat capacity data to be large, 10 and 16 states/eV per formula unit for EuCo2P2 and BaCo2P2, respectively. These values are enhanced by a factor of ~2.5 above those found from DFT electronic structure calculations for the two compounds. Additionally, the calculations also find ferromagnetic Eu–Eu exchange interactions within the ab plane and AFM interactions between Eu spins in nearest- and next-nearest planes, in agreement with the MFT analysis of χab(T≤TN).},

  doi          = {10.1103/PhysRevB.94.014422},

  journal      = {Physical Review B},

  number       = 1,

  volume       = 94,

  place        = {United States},

  year         = {Tue Jul 19 00:00:00 EDT 2016},

  month        = {Tue Jul 19 00:00:00 EDT 2016}

}

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Works referencing / citing this record:

Reply to “Comment on ‘Magnetic structure and magnetization of $z$ -axis helical Heisenberg antiferromagnets with XY anisotropy in high magnetic fields transverse to the helix axis at zero temperature’ ”
journal, January 2020

Johnston, David C.
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Title: EuCo2P2: A Model Molecular-Field Helical Heisenberg Antiferromagnet

Abstract

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Title: EuCo₂P₂: A Model Molecular-Field Helical Heisenberg Antiferromagnet

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Unified molecular field theory for collinear and noncollinear Heisenberg antiferromagnets
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Superconductivity and the effects of pressure and structure in single-crystalline ${SrNi}_{2} P_{2}$
journal, April 2009

Magnetic exchange interactions in ${BaMn}_{2} {As}_{2}$ : A case study of the $J_{1}$ - $J_{2}$ - $J_{c}$ Heisenberg model
journal, September 2011

Demagnetizing factors for rectangular ferromagnetic prisms
journal, March 1998

Reply to “Comment on ‘Magnetic structure and magnetization of $z$ -axis helical Heisenberg antiferromagnets with XY anisotropy in high magnetic fields transverse to the helix axis at zero temperature’ ”
journal, January 2020