Synthesis, structure, and magnetism of Tb4PdGa12 and Tb4PtGa12

Williams, Willa M.; Moldovan, M.; Young, David P.; Chan, Julia Y.

doi:10.1016/j.jssc.2004.10.026

Cited by 13 publications

(23 citation statements)

References 33 publications

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“…So far, the magnetic properties of 4:1:12 compounds are only known for Tb 4 PdGa 12 and Tb 4 PtGa 12 that both order antiferromagnetically at T N = 16 and 12 K and display metamagnetic transitions at 0 H c ≈ 5 and 0.3 T, respectively [24,25]. Similarly, U 4 PdGa 12 also orders antiferromagnetically, at T N = 43 K, but does not show any metamagnetic transitions up to μ 0 H c = 9 T.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Jardin¹,

Colineau²,

Griveau³

et al. 2007

Journal of Alloys and Compounds

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Section: Discussionmentioning

confidence: 99%

“…Recently, the first physical measurements of 4:1:12 compounds were reported on two isotype compounds, Tb 4 PdGa 12 and Tb 4 PtGa 12 . They both order antiferromagnetically at T N = 16 and 12 K and present metamagnetic transitions at μ 0 H c ≈ 5 and 0.3 T, respectively [24,25].…”

Section: Introductionmentioning

confidence: 99%

A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Jardin¹,

Colineau²,

Griveau³

et al. 2007

Journal of Alloys and Compounds

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“…Alternatively to the above method, the ternary phase can also be synthesized following the published heating profile for Tb 4 PdGa 12 . 42 Yttrium (0.068 g, 1 mmol), manganese (0.041 g, 1 mmol), and excess gallium (1.0532 g, 20 mmol) were combined in an alumina crucible and sealed in the same manner as mentioned above. The tube was heated to 1150 °C over 7 h, slowly cooled to 530 °C over 41 h, then cooled down to 300 °C in 2 h, inverted, and centrifuged to remove excess Ga flux.…”

Section: Methodsmentioning

confidence: 99%

Development and Loss of Ferromagnetism Controlled by the Interplay of Ge Concentration and Mn Vacancies in Structurally Modulated Y₄Mn_1−xGa_12−yGe_y

et al. 2010

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The cubic intermetallic phase Y(4)Mn(1-x)Ga(12-y)Ge(y) (x = 0-0.26, y = 0-4.0) has been isolated from a molten gallium flux reaction. It presents a rare example of a system where ferromagnetism can be induced by controlling the vacancies of the magnetic centers. The Y(4)PdGa(12) type crystal structure is made up of a corner-sharing octahedral network of Ga and Ge atoms with Mn atoms at the centers of half the octahedra and Y atoms in the voids. At the highest Ge concentration, y = 4.0, the Mn site is nearly fully occupied, x = 0.05, and the samples are paramagnetic. At a lower Ge concentration, y = 1.0, Mn deficiency develops with x = 0.10. Surprisingly, strong ferromagnetism is observed with T(c) = 223 K. When Ge is excluded, y = 0, Mn is substantially deficient at x = 0.26 and ferromagnetism is maintained with a T(c) of approximately 160 K. In addition, a 6-fold modulated superstructure appears owing to an ordered slab-like segregation of Mn atoms and vacancies. Corresponding bond distortions propagate throughout the octahedral Ga network. Structure-property relationships are examined with X-ray and neutron diffraction, magnetic susceptibility, and electrical resistivity measurements.

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“…Clues to how atomic sizes may influence the favorability of the HoCoGa 5 type can be found in our earlier CP analysis of the Y 4 PdGa 12 structure type, which can accommodate larger transition metal atoms into the octahedral holes of a AuCu 3 -like YGa 3 network (Figure a). − A hypothetical “YGa 3 ” phase was found to be destabilized by the stretching of the Ga–Ga interactions due to the relatively large size of the Y atoms. Filling 1/4 of the octahedral holes with a transition metal atom was found to relieve this situation in two ways: (1) the presence on the T atoms replaced the overly long the Ga–Ga contacts in their Ga 6 environment with nearly ideal T–Ga ones, and (2) the expansion of the stuffed Ga 6 octahedron compresses the Ga–Ga distances in neighboring unstuffed octahedra.…”

Section: Results and Discussionmentioning

confidence: 91%

Putting ScTGa₅(T = Fe, Co, Ni) on the Map: How Electron Counts and Chemical Pressure Shape the Stability Range of the HoCoGa₅Type

Engelkemier

Green

McDougald

et al. 2016

Crystal Growth & Design

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We explore the factors stabilizing one member of the diverse structures encountered in Ln–T–E systems (Ln = lanthanide or similar early d-block element, T = transition metal, E = p-block element): the HoCoGa5 type, an arrangement of atoms associated with unconventional superconductivity. We first probe the boundaries of its stability range through the growth and characterization of ScTGa5 crystals (T = Fe, Co, Ni). After confirming that these compounds adopt the HoCoGa5 type, we analyze their electronic structure using density functional theory (DFT) and DFT-calibrated Hückel calculations. The observed valence electron count range of the HoCoGa5 type is explained in terms of the 18-n rule, with n = 6 for the Ln atoms and n = 2 for the T sites. The role of atomic sizes is investigated with DFT-chemical pressure (DFT-CP) analysis of ScNiGa5, which reveals negative pressures within the Ga sublattice as it stretches to accommodate the Sc and T atoms. This CP scheme is consistent with HoCoGa5-type gallides only being observed for relatively small Ln and T atoms. These conclusions account for the relative positions of the HoCoGa5, BaMg4Si3, and Ce2NiGa10 types in a structure map, demonstrating how combining the 18-n and CP schemes can guide our understanding of Ln–T–E systems.

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Synthesis, structure, and magnetism of Tb4PdGa12 and Tb4PtGa12

Cited by 13 publications

References 33 publications

A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Development and Loss of Ferromagnetism Controlled by the Interplay of Ge Concentration and Mn Vacancies in Structurally Modulated Y₄Mn_1−xGa_12−yGe_y

Putting ScTGa₅(T = Fe, Co, Ni) on the Map: How Electron Counts and Chemical Pressure Shape the Stability Range of the HoCoGa₅Type

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Synthesis, structure, and magnetism of Tb4PdGa12 and Tb4PtGa12

Cited by 13 publications

References 33 publications

A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Development and Loss of Ferromagnetism Controlled by the Interplay of Ge Concentration and Mn Vacancies in Structurally Modulated Y4Mn1−xGa12−yGey

Putting ScTGa5(T = Fe, Co, Ni) on the Map: How Electron Counts and Chemical Pressure Shape the Stability Range of the HoCoGa5Type

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Development and Loss of Ferromagnetism Controlled by the Interplay of Ge Concentration and Mn Vacancies in Structurally Modulated Y₄Mn_1−xGa_12−yGe_y

Putting ScTGa₅(T = Fe, Co, Ni) on the Map: How Electron Counts and Chemical Pressure Shape the Stability Range of the HoCoGa₅Type