Dipole interaction and magnetic anisotropy in gadolinium compounds

Rotter, Martin; Loewenhaupt, M.; Doerr, M.; Lindbaum, A.; Sassik, H.; Ziebeck, K.R.A.; Beuneu, B.

doi:10.1103/physrevb.68.144418

Cited by 66 publications

(67 citation statements)

References 33 publications

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“…10,11 Again, the MA in Gd compounds is usually of the order of less than a few tens of eV/ atom. 9 In this connection, the results reported recently for a polycrystalline GdSi sample are surprising. This compound crystallises in the FeB type of structure with space group Pnma.…”

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confidence: 68%

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Field-induced magnetic phase transitions in a GdSi single crystal

Tung¹,

Lees²,

Balakrishnan³

et al. 2005

Phys. Rev. B

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confidence: 68%

“…8,9 In few cases, the crystal field and exchange effects coming from higher multiplets have been discussed as possible sources. 10,11 Again, the MA in Gd compounds is usually of the order of less than a few tens of eV/ atom.…”

mentioning

confidence: 99%

Field-induced magnetic phase transitions in a GdSi single crystal

Tung¹,

Lees²,

Balakrishnan³

et al. 2005

Phys. Rev. B

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“…The third term B near int α i is the contribution to the local magnetic induction in the α th direction due to the discrete point magnetic dipoles around a central spin within the Lorentz cavity centered on the central spin given by 47,48 B near int α i = −2…”

Section: Influence Of Magnetic Dipole Interactionsmentioning

confidence: 99%

Antiferromagnetism inEuCu2As2andEuCu1.82Sb2single crystals

Anand

Johnston

2015

Phys. Rev. B

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Single crystals of EuCu2As2 and EuCu2Sb2 were grown from CuAs and CuSb self-flux, respectively. The crystallographic, magnetic, thermal and electronic transport properties of the single crystals were investigated by room-temperature x-ray diffraction, magnetic susceptibility χ versus temperature T , isothermal magnetization M versus magnetic field H, specific heat Cp(T ) and electrical resistivity ρ(T ) measurements. EuCu2As2 crystallizes in the body-centered tetragonal ThCr2Si2-type structure (space group I4/mmm), whereas EuCu2Sb2 crystallizes in the related primitive tetragonal CaBe2Ge2-type structure (space group P 4/nmm). The x-ray and energy-dispersive x-ray spectroscopy data for the EuCu2Sb2 crystals showed the presence of vacancies on the Cu sites, yielding the actual composition EuCu1.82Sb2. The ρ(T ) and Cp(T ) data reveal metallic character for both EuCu2As2 and EuCu1.82Sb2. Antiferromagnetic (AFM) ordering is indicated from the χ(T ), Cp(T ), and ρ(T ) data for both EuCu2As2 (TN = 17.5 K) and EuCu1.82Sb2 (TN = 5.1 K). In EuCu1.82Sb2, the ordered-state χ(T ) and M (H) data suggest either a collinear A-type AFM ordering of Eu +2 spins S = 7/2 or a planar noncollinear AFM structure, with the ordered moments oriented in the tetragonal ab plane in either case. This ordered-moment orientation for the A-type AFM is consistent with calculations with magnetic dipole interactions. The anisotropic χ(T ) and isothermal M (H) data for EuCu2As2, also containing Eu +2 spins S = 7/2, strongly deviate from the predictions of molecular field theory for collinear AFM ordering and the AFM structure appears to be both noncollinear and noncoplanar.

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“…Gadolinium antiferromagnets (see [79,80], and Table I in [81]) offer two important advantages for an experimental study of the Zeeman spin-orbit coupling. Firstly, their often elevated Néel temperature T N (such as 134 K for GdAg, or 150 K for GdCu) facilitates experimental access to temperatures well below T N , where thermal fluctuations of antiferromagnetic order are frozen out.…”

Section: Other Materials Of Interestmentioning

confidence: 99%

Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

Ramazashvili

2009

Phys. Rev. B

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In this article, I analyze the symmetries and degeneracies of electron eigenstates in a commensurate collinear antiferromagnet. In a magnetic field transverse to the staggered magnetization, a hidden anti-unitary symmetry protects double degeneracy of the Bloch eigenstates at a special set of momenta. In addition to this 'Kramers degeneracy' subset, the manifold of momenta, labeling the doubly degenerate Bloch states in the Brillouin zone, may also contain an 'accidental degeneracy' subset, that is not protected by symmetry and that may change its shape under perturbation. These degeneracies give rise to a substantial momentum dependence of the transverse g-factor in the Zeeman coupling, turning the latter into a spin-orbit interaction.I discuss a number of materials, where Zeeman spin-orbit coupling is likely to be present, and outline the simplest properties and experimental consequences of this interaction, that may be relevant to systems from chromium to borocarbides, cuprates, hexaborides, iron pnictides, as well as organic and heavy fermion conductors.

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Dipole interaction and magnetic anisotropy in gadolinium compounds

Cited by 66 publications

References 33 publications

Field-induced magnetic phase transitions in a GdSi single crystal

Field-induced magnetic phase transitions in a GdSi single crystal

Antiferromagnetism inEuCu2As2andEuCu1.82Sb2single crystals

Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

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