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  Itinerant and local-moment magnetism in EuCr2As2 single crystals

Paramanik, U. B., Prasad, R., Geibel, C., & Hossain, Z. (2014). Itinerant and local-moment magnetism in EuCr2As2 single crystals. Physical Review B, 89(14): 144423, pp. 1-8. doi:10.1103/PhysRevB.89.144423.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-B9F5-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FF07-A
Genre: Journal Article

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Paramanik, U. B.1, Author
Prasad, R.1, Author
Geibel, C.2, Author              
Hossain, Z.3, Author              
Affiliations:
1external, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: We report on the crystal structure, physical properties, and electronic structure calculations for the ternary pnictide compound EuCr2As2. X-ray diffraction studies confirmed that EuCr2As2 crystalizes in the ThCr2Si2-type tetragonal structure (space group I4/mmm). The Eu ions are in a stable divalent state in this compound. Eu moments in EuCr2As2 order magnetically below T-m = 21 K. A sharp increase in the magnetic susceptibility below Tm and the positive value of the paramagnetic Curie temperature obtained from the Curie-Weiss fit suggest dominant ferromagnetic interactions. The heat capacity exhibits a sharp.-shape anomaly at Tm, confirming the bulk nature of the magnetic transition. The extracted magnetic entropy at the magnetic transition temperature is consistent with the theoretical value R ln(2S + 1) for S = 7/2 of the Eu2+ ion. The temperature dependence of the electrical resistivity.(T) shows metallic behavior along with an anomaly at 21 K. In addition, we observe a reasonably large negative magnetoresistance (similar to -24%) at lower temperature. Electronic structure calculations for EuCr2As2 reveal a moderately high density of states of Cr-3d orbitals at the Fermi energy, indicating that the nonmagnetic state of Cr is unstable against magnetic order. Our density functional calculations for EuCr2As2 predict a G-type AFM order in the Cr sublattice. The electronic structure calculations suggest a weak interlayer coupling of the Eu moments.

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 Dates: 2014-04-25
 Publication Status: Published in print
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 89 (14) Sequence Number: 144423 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008