LaIr<sub>3</sub>Ga<sub>2</sub>: A Superconductor Based on a Kagome Lattice of Ir

Gui, Xin; Cava, R. J.

doi:10.1021/acs.chemmater.2c00280

Cited by 24 publications

(23 citation statements)

References 53 publications

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“…Below ∼18 K, a weak upturn of the resistivity is observed (also shown by the change in sign of the d ρ ( T )/d T versus T curve in the inset), followed by a superconductor-like transition ∼3.6 K (upper inset Figure b). Above the upturn of the resistivity, the low-temperature ρ ( T ) data (23–60 K) are well fitted using the equation ρ ( T ) = ρ (0) + AT n (black line in Figure b), with n = 2.04, ρ (0) ≈ 14.7 μΩ cm, and A ≈ 0.00127 μΩ cm K –2 , suggesting that electron–electron interactions dominate electronic transport in this regime. , …”

Section: Resultsmentioning

confidence: 99%

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Wang

McCandless

et al. 2022

Chem. Mater.

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The Kagome lattice is an important fundamental structure in condensed matter physics for investigating the interplay of electron correlation, topology, and frustrated magnetism. Recent work on Kagome metals in the AV 3 Sb 5 (A = K, Rb, and Cs) family has shown a multitude of correlation-driven distortions, including symmetry breaking charge density waves and nematic superconductivity at low temperatures. Here, we study the new Kagome metal Yb 0.5 Co 3 Ge 3 and find a temperature-dependent kink in the resistivity that is highly similar to the AV 3 Sb 5 behavior and is commensurate with an in-plane structural distortion of the Co Kagome lattice along with a doubling of the c-axis. The symmetry is lower below the transition temperature, with a breaking the in-plane mirror planes and C 6 rotation, while gaining a screw axis along the c-direction. At very low temperatures, anisotropic negative magnetoresistance is observed, which may be related to anisotropic magnetism. This raises questions about the types of the distortions in Kagome nets and their resulting physical properties including superconductivity and magnetism.

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Section: Resultsmentioning

confidence: 99%

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Wang

McCandless

et al. 2022

Chem. Mater.

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“…After the compounds with a linked kagome lattice are excluded, the majority of remaining compounds satisfies our expectations based on their t value: compounds for which t is less than 1.4 have some clean or filled kagome bands, while compounds with t greater than 1.4 have no kagome bands. The commonly studied kagome compounds belong to a handful of structure types in these space groups (Figure S12), such as Ni 3 Pb 2 S 2 type in the space group ,− and CoSn, , MgFe 6 Ge 6 , − and Co 3 GdB 2 , types in the P 6/ mmm space group. Both structure types of the hexagonal Laves phases, MgZn 2 and MgNi 2 , belong to the P 6 3 / mmc space group (Figure S12).…”

Section: Resultsmentioning

confidence: 99%

Simple Chemical Rules for Predicting Band Structures of Kagome Materials

Jovanović

Schoop

2022

J. Am. Chem. Soc.

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Compounds featuring a kagome lattice are studied for a wide range of properties, from localized magnetism to massless and massive Dirac Fermions. These properties come from the symmetry of the kagome lattice, which gives rise to Dirac cones and flat bands. However, not all compounds with a kagome sublattice show properties related to it. We derive chemical rules predicting if the low-energy physics of a material is determined by the kagome sublattice and bands arising from it. After sorting out all known crystals with the kagome lattice into four groups, we use chemical heuristics and local symmetry to explain additional conditions that need to be met to have kagome bands near the Fermi level.

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“…For intermetallic phasessolid state compounds composed of two or more metallic elementssuch relationships are still needed for diverse properties such as superconductivity, − permanent magnetism, − thermoelectricity, − and catalysis. , The gap between structure and properties in intermetallics is further widened by a vast range of possible elemental combinations coupled with the boundless variability of crystal structures they can adopt. Nevertheless, immense progress has been made in connecting intermetallics and their properties: the phonon–glass/electron–crystal model provides a guiding principle for the search for thermoelectric materials, − specific sublattice geometries are associated with unique band structures and physical behavior, − and packings of magnetically active elements in triangular arrangements are associated with complex phenomena arising from frustration. − …”

Section: Introductionmentioning

confidence: 99%

A Tour of Soft Atomic Motions: Chemical Pressure Quadrupoles Across Transition Metal–Main Group 1:2 Structure Types

Kamp

Fredrickson

2022

Chem. Mater.

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The rational design of materials requires an understanding of the relationships between structure and properties. In some fields, advances in computational tools and modeling have mapped out many of these connections. In the realm of intermetallics, however, principles for such relationships are still needed. Recently, we illustrated how the DFT–Chemical Pressure (CP) analysis can link geometrical motifs within crystalline arrangements to the phonon band structures of intermetallics and thus the physical properties related to vibrations and atomic motion. The key indicators here are quadrupolar CP featuresdistributions in which positive and negative interatomic pressures are oriented perpendicular to one another. These quadrupoles then create low energy paths of motion for the atoms that can be linked to various structural phenomena, such as anisotropic vibrations and incommensurate modulations. In this article, we survey the presence of CP quadrupoles in a collection of TE2 structures (T = transition metal and E = main group element) and the roles they play in the behavior observed for these compounds. We begin by developing a metric for CP quadrupolar character, which can be calculated from the output of CP analysis. After compiling these metrics for 17 TE2 structure types, we delve deeper into four systems detected as exhibiting atomic sites with quadrupolar character: (1) the Co–Sn binary system, where the quadrupoles on the Co atoms in CuAl2-type CoSn2 direct the features of its superstructure in CoSn3; (2) arsenopyrite-type CoSb2, in which the highly quadrupolar CP distributions on the Sb atoms correlate with the motions followed during the phase transition to its high-temperature marcasite-type form; (3) the CrSi2 structure, in which the expansion of the lattice is predicted to open a helical path of potential soft motion analogous to that underlying the Nowotny Chimney Ladder series; and (4) the CdAs2 type, whose CP features anticipate the ability to incorporate Li atoms as guests. Together, these case studies highlight the potential for CP quadrupoles to link local atomic arrangements with a variety of emergent properties in intermetallic phases.

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LaIr₃Ga₂: A Superconductor Based on a Kagome Lattice of Ir

Cited by 24 publications

References 53 publications

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Simple Chemical Rules for Predicting Band Structures of Kagome Materials

A Tour of Soft Atomic Motions: Chemical Pressure Quadrupoles Across Transition Metal–Main Group 1:2 Structure Types

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LaIr3Ga2: A Superconductor Based on a Kagome Lattice of Ir

Cited by 24 publications

References 53 publications

Electronic Properties and Phase Transition in the Kagome Metal Yb0.5Co3Ge3

Electronic Properties and Phase Transition in the Kagome Metal Yb0.5Co3Ge3

Simple Chemical Rules for Predicting Band Structures of Kagome Materials

A Tour of Soft Atomic Motions: Chemical Pressure Quadrupoles Across Transition Metal–Main Group 1:2 Structure Types

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LaIr₃Ga₂: A Superconductor Based on a Kagome Lattice of Ir

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃