Experimental determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mn>5</mml:mn><mml:mi>d</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mtext>−</mml:mtext><mml:mi>T</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mi>d</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>hybridization in rare-earth intermetallics

Laguna-Marco, M. A.; Chaboy, J.; Piquer, Cristina

doi:10.1103/physrevb.77.125132

Cited by 39 publications

(50 citation statements)

References 25 publications

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“…2) are comparable with those in binary TbAl 2 and HoAl 2 compounds [31], and the Al-rich Ln(Al 1−x Fe x ) compounds (with Ln = Tb and Ho) [32]. In heavy rare-earths ions, the positive L 3 and negative L 2 peaks indicate that the average rare-earth moment is polarized in the direction of the applied field.…”

Section: A Xas and Xmcd At Constant Fieldmentioning

confidence: 60%

Intracluster interactions in butterfly{Fe3LnO2}molecules with the non-Kramers ions Tb(III) and Ho(III)

et al. 2015

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The intracluster exchange interactions within the "butterfly" [Fe 3 Ln(μ 3 -O) 2 (CCl 3 COO) 8 (H 2 O)(THF) 3 ] molecules, where Ln(III) represents a lanthanide cation, have been determined by a combination of x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometry (VSM) along with an interaction model. We have studied the compounds with Ln = Tb and Ho, both non-Kramers lanthanides and with high uniaxial anisotropy, and Ln = Lu(III) and Y(III) as pseudolanthanides, which supply nonmagnetic Ln reference cases. At low temperature, the three Fe atoms can be considered as a self-unit with total spin S Fe 3 = 5/2. Using the element selectivity of the XMCD magnetometry, measured at the Ln L 2,3 edges, together with the VSM measurements, the local magnetization of the Ln ion and the Fe 3 subcluster, as a function of the field and low temperature (T ≈ 2.5 K), has been determined separately. These results are described quantitatively in the framework of a theoretical model based on an effective spin Hamiltonian, which considers the competing effects of intracluster interactions and the external applied magnetic field. The Ln-Fe 3 exchange interaction within the {Fe 3 LnO 2 } cluster has been determined to be antiferromagnetic, in both Tb and Ho compounds, with J FeTb /k B = −0.13(1) K and J FeHo /k B = −0.18(1) K, respectively. In both cases, a field-induced reorientation of the Fe 3 and Ln spins from antiparallel to parallel orientation takes place at a threshold field μ 0 H = 1.1 and 2 T, for the {Fe 3 TbO 2 } and {Fe 3 HoO 2 } compounds, respectively. By comparison with other compounds of the series with uniaxial anisotropy, it is concluded that the polarizability of the Fe 3 subcluster magnetic moment decreases in the trend {Fe 3 YO 2 } → {Fe 3 TbO 2 } → {Fe 3 HoO 2 } → {Fe 3 DyO 2 }, because of the increasing opposition of the exchange antiferromagnetic field caused by the Ln ion. In the Ln = Tb, Ho, and Dy, the magnetization of the whole molecule is dominated by the anisotropy of the Ln ion. The intracluster Fe 3 -Ln exchange interactions are very weak compared to the Ln ligand field and Fe-Fe exchange interactions.

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Section: A Xas and Xmcd At Constant Fieldmentioning

confidence: 60%

Intracluster interactions in butterfly{Fe3LnO2}molecules with the non-Kramers ions Tb(III) and Ho(III)

et al. 2015

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“…By comparison we may assert that the Ln moment in both compounds {Fe 3 DyO 2 } and {Fe 3 GdO 2 } remains parallel to the applied field at the measured temperature (T ≈ 2.5 K) and field (B < 9 T). Besides, contrary to the case of Ln-Fe intermetallics, 50 no influence of Fe on the spectral shape of the Ln L edges is observed, which indicates a much weaker Ln-Fe interaction in the butterfly molecule.…”

Section: A Xanes and Xmcd At A Constant Fieldmentioning

confidence: 77%

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
21
2
14
0
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The intramolecular exchange interactions within the single-molecule magnet (SMM) "butterfly" molecule [Fe 3 Ln(μ 3 -O) 2 (CCl 3 COO) 8 (H 2 O)(THF) 3 ], where Ln(III) represents a lanthanide cation, are determined in a combined experimental [x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometer (VSM)] and theoretical work. Compounds with Ln = Gd and Dy, which represent extreme cases where the rare earth presents single-ion isotropic and uniaxial anisotropy, on one hand, and with Ln = Lu and Y(III) as pseudolanthanide substitutions that supply a nonmagnetic Ln reference case, on the other hand, are studied. The Dy single-ion uniaxial anisotropy is estimated from ab initio calculations. Low-temperature (T 2.5 K) hard x-ray XMCD at the Ln L 2,3 edges and VSM measurements as a function of the field indicate that the Ln moment dominates the polarization of the molecule by the applied field. Within the {Fe 3 LnO 2 } cluster the Ln-Fe 3 subcluster interaction is determined to be antiferromagnetic in both Dy and Gd compounds, with values J Dy-Fe 3 = −0.4 K and J Gd-Fe 3 = −0.25 K, by fitting to spin Hamiltonian simulations that consider the competing effects of intracluster interactions and the external applied magnetic field. In the uniaxial anisotropic {Fe 3 DyO 2 } case, a field-induced reorientation of the Fe 3 and Dy spins from an antiparallel to a parallel orientation takes place at a threshold field (μ 0 H = 4 T). In contrast, in isotropic {Fe 3 GdO 2 } this reorientation does not occur.

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“…It should be emphasized that the dichroic spectrum is changed so as to reach that of the reference material RAl 2 , in which only the R partner carries the magnetic moments. Since the peak A includes the R(5d)-Co(3d) hybridized component [7,8], the increase in the peak A may be interpreted as caused by pressure-induced suppression of M Co . In the same way as the previous study using the Er L 2 -edge [3], we assumed that the magnitude of M Co is proportional to the difference between the XMCD spectra in RCo 2 and RAl2.…”

Section: Resultsmentioning

confidence: 99%

Pressure dependence of magnetic states in Laves PhaseRCo₂(R= Dy, Ho, and Er) compounds probed by XMCD

Watanabe

Ishimatsu

Maruyama

et al. 2009

J. Phys.: Conf. Ser.

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Abstract. In order to probe pressure-induced modification in Co magnetic state in Laves phase RCo 2 (R=Dy, Ho, and Er) compounds, we have measured X-ray magnetic circular dichroism (XMCD) under high pressure. The R L 2 -edge XMCD indicates that Co magnetic moment M Co gradually decreases as the pressure increases. The Co K-edge XMCD shows that the effect of R molecular field is significantly suppressed under high pressure. As a result, it is revealed that the pressure variation of M Co is closely associated with R-Co interaction. The Co magnetic state is separately discussed from that of R partner. IntroductionIn the cubic Laves phase RCo 2 (R= rare-earth element) compounds, magnetic phase transition is ascribed to instability of Co magnetic state, which is strongly affected by the internal molecular field provided by R moments [1,2]. To clarify experimentally this explanation, we have made X-ray magnetic circular dichroism (XMCD) in ErCo 2 under high pressure [3]. As a result, it has been revealed that the Co moments M Co monotonically decrease with increasing pressure whereas the Er moments M Er remain almost constant under the pressure up to 4.2 GPa, and that the applied pressure weakens the contribution of Er to the Co magnetic state. However, it is still not clear how the magnetic interaction between Co and R partner influences the Co magnetic state under pressure.In order to probe pressure-induced transition of RCo 2 , XMCD is a powerful tool because of a capability of providing the information about the magnetic states with an element-selectivity. When the R partner element is replaced by heavier R, the magnetic properties show a systematic reduction, e.g. Curie temperature T C [4] , Co magnetic moment [2]. In the RCo 2 series, DyCo 2 , HoCo 2 and ErCo 2 show a first-order magnetic phase transition from paramagnetism to ferrimagnetism at T C =137 K, 78 K, and 32 K under ambient pressure. As the applied pressure increases, T C linearly decreases at low pressures and asymptotically approaches a temperature above critical pressure P c . The magnetic phase transition also changes to a second-order above P c , which goes down with the replacement of

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Experimental determination of theR(5d)−T(3d)hybridization in rare-earth intermetallics

Cited by 39 publications

References 25 publications

Intracluster interactions in butterfly{Fe3LnO2}molecules with the non-Kramers ions Tb(III) and Ho(III)

Intracluster interactions in butterfly{Fe3LnO2}molecules with the non-Kramers ions Tb(III) and Ho(III)

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
21
2
14
0
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Pressure dependence of magnetic states in Laves PhaseRCo₂(R= Dy, Ho, and Er) compounds probed by XMCD

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Experimental determination of theR(5d)−T(3d)hybridization in rare-earth intermetallics

Cited by 39 publications

References 25 publications

Intracluster interactions in butterfly{Fe3LnO2}molecules with the non-Kramers ions Tb(III) and Ho(III)

Intracluster interactions in butterfly{Fe3LnO2}molecules with the non-Kramers ions Tb(III) and Ho(III)

Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(LnBadía-Romano1, Bartolomé2, Bartolomé3 et al. 2013Phys. Rev. B212140View full textAdd to dashboardCite

Pressure dependence of magnetic states in Laves PhaseRCo2(R= Dy, Ho, and Er) compounds probed by XMCD

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Field-induced internal Fe and Ln spin reorientation in butterfly{Fe3LnO2}(Ln
Badía-Romano
¹
,
Bartolomé
²
,
Bartolomé
³

et al. 2013
Phys. Rev. B
21
2
14
0
View full text Add to dashboard Cite

Pressure dependence of magnetic states in Laves PhaseRCo₂(R= Dy, Ho, and Er) compounds probed by XMCD