Sm magnetism in the layered compound SmMn2Ge2

A. Barla; J. P. Sanchez; B. Malaman; B. P. Doyle; R. Rüffer

doi:10.1103/PhysRevB.69.220405

Sm magnetism in the layered compound SmMn₂Ge₂

A. Barla, J. P. Sanchez, B. Malaman, B. P. Doyle, R. Rüffer

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

We have applied ¹⁴⁹Sm nuclear forward scattering of synchrotron radiation to study the magnetism of the Sm sublattice in SmMn₂Ge _2. Our results show that, in the whole temperature range between 4 and 250 K spanning three different magnetic structures, the Sm³⁺ ions are magnetically ordered. At 4 K the 4f contributions to the magnetic hyperfine field and to the electric quadrupole interaction are very close to the free ion value of Sm³⁺, suggesting that the ground state of these ions in SmMn₂Ge₂ is an almost pure |5/2〉 state. For temperatures higher than 100 K only a fraction of the Sm ions show an ordered magnetic moment, the others being paramagnetic. The smooth variation with temperature of the hyperfine parameters suggests that the ordered Sm moments lie in the basal plane in all phases. The upper limit for the Sm ordered moment at T =250 K can be estimated as ∼0.1 μ_B.

Original language	English
Article number	220405
Pages (from-to)	220405-1-220405-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	69
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.69.220405
Publication status	Published - Jun 2004
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.69.220405

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abstract = "We have applied 149Sm nuclear forward scattering of synchrotron radiation to study the magnetism of the Sm sublattice in SmMn2Ge 2. Our results show that, in the whole temperature range between 4 and 250 K spanning three different magnetic structures, the Sm3+ ions are magnetically ordered. At 4 K the 4f contributions to the magnetic hyperfine field and to the electric quadrupole interaction are very close to the free ion value of Sm3+, suggesting that the ground state of these ions in SmMn2Ge2 is an almost pure |5/2〉 state. For temperatures higher than 100 K only a fraction of the Sm ions show an ordered magnetic moment, the others being paramagnetic. The smooth variation with temperature of the hyperfine parameters suggests that the ordered Sm moments lie in the basal plane in all phases. The upper limit for the Sm ordered moment at T =250 K can be estimated as ∼0.1 μB.",

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T1 - Sm magnetism in the layered compound SmMn2Ge2

AU - Barla, A.

AU - Sanchez, J. P.

AU - Malaman, B.

AU - Doyle, B. P.

AU - Rüffer, R.

PY - 2004/6

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AB - We have applied 149Sm nuclear forward scattering of synchrotron radiation to study the magnetism of the Sm sublattice in SmMn2Ge 2. Our results show that, in the whole temperature range between 4 and 250 K spanning three different magnetic structures, the Sm3+ ions are magnetically ordered. At 4 K the 4f contributions to the magnetic hyperfine field and to the electric quadrupole interaction are very close to the free ion value of Sm3+, suggesting that the ground state of these ions in SmMn2Ge2 is an almost pure |5/2〉 state. For temperatures higher than 100 K only a fraction of the Sm ions show an ordered magnetic moment, the others being paramagnetic. The smooth variation with temperature of the hyperfine parameters suggests that the ordered Sm moments lie in the basal plane in all phases. The upper limit for the Sm ordered moment at T =250 K can be estimated as ∼0.1 μB.

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Sm magnetism in the layered compound SmMn₂Ge₂

Abstract

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