Lanthanum tetraboride

Kato, K.; Kawada, I.; Oshima, C.; Kawai, S.

doi:10.1107/s0567740874008570

Cited by 23 publications

(7 citation statements)

References 4 publications

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“…The La-B system contains the cP7-LaB 6 (SG#221) 206 and tP20-LaB 4 (SG#127) phases 207 , which agrees with this study. At 30 GPa, an additional hP8-LaB (SG#194) phase defines the convex hull.…”

Section: La-bsupporting

confidence: 91%

Stability of 41 metal–boron systems at 0GPa and 30GPa from first principles

Geest

Kolmogorov

2014

Calphad

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A multitude of observed boron-based materials have outstanding superconducting, mechanical, and refractory properties. Yet, the structure, the composition, and the very existence of some reported metal boride (M-B) compounds have been a subject of extensive debate. This density functional theory work seeks to set a baseline for current understanding of known metal boride phases as well as to identify new synthesizable candidates. We have generated a database of over 12,000 binary M-B entries for pressures of 0 and 30 GPa producing the largest scan of compositions and systems in this materials class. The 175 selected crystal structures include both observed prototypes and new ones found with our evolutionary ground state search. The metals considered are: Al, and Zr. Based on the formation energy calculated at zero pressure and temperature 4 new M-B phases or structures have been predicted, while a number of previously reported compounds have been shown to be unstable. At 30 GPa, changes in the convex hulls are expected to occur in 18 out of 41 M-B systems, which is used to indicate regions of the periodic table (for metal borides) that require further investigation from the community. Analysis of the collected information has revealed a nearly linear relationship between the magnetic moment per atom and the metal content for all the Fe-B, Co-B, and Ni-B structures within 0.15 eV/atom of the stability tie line. Both GGA-PBE and LDA-PW functionals were used to provide an understanding of the systematic error introduced by the choice of the exchange-correlation functional.arXiv:1310.4157v2 [cond-mat.mtrl-sci]

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Section: La-bsupporting

confidence: 91%

Stability of 41 metal–boron systems at 0GPa and 30GPa from first principles

Geest

Kolmogorov

2014

Calphad

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“…The energetic stabilities of LaB x compounds were evaluated from their formation enthalpies with respect to the dissociation products of La [42] and B [1] solids. Previously known LaB, LaB 4 , and LaB 6 phases were readily identified [18][19][20], indicating the reliability of our calculations (Fig. 1b).…”

Section: Resultssupporting

confidence: 81%

“…The formation of La-B compounds under ambient pressures has been extensively studied, but only LaB 4 and LaB 6 phases have been characterized reliably [18,19]. Their structures feature three-dimensional B backbones of B 6 octahedra with La in interstitial sites.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Clathrate LaB8 with Superconductivity

Ma,

Yang,

Liu

et al. 2021

Preprint

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Boron-based clathrate materials, typically with three-dimensional networks of B atoms, have tunable properties through substitution of guest atoms, but the tuning of B cages themselves has not yet been developed. By combining crystal structural search with the laser-heated diamond anvil cell technique, we successfully synthesized a new B-based clathrate boride, LaB 8 , at ∼108 GPa and ∼2100 K. The novel structure has a B-richest cage, with 26 B atoms encapsulating a single La atom. LaB 8 demonstrates phonon-mediated superconductivity with an estimated transition temperature of 14 K at ambient pressure, mainly originating from electron-phonon coupling of B cage. The replacement of La with alkaline earth metals can remarkably elevate the transition temperature. This work creates a prototype platform for subsequent investigation on tunable electronic properties through the choice of captured atoms.

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“…The R ions form a frustrated Shastry-Sutherland lattice (SSL) with competing interactions J 1 and J 2 [7]. Quite remarkably, high resolution structural refinement of LaB 4 [8] and HoB 4 [9] show that the R-R bonds corresponding to J 1 and J 2 are equal in length, making the R-sublattice a rare physical realization of one of the eleven Archimedean lattices [10] (Fig. 1(b)).…”

mentioning

confidence: 99%

Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnetTmB4

et al. 2016

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We study TmB 4 , a frustrated magnet on the Archimedean Shastry-Sutherland lattice, through magnetization and transport experiments. The lack of anisotropy in resistivity shows that TmB 4 is an electronically three-dimensional system. The magnetoresistance (MR) is hysteretic at lowtemperature even though a corresponding hysteresis in magnetization is absent. The Hall resistivity shows unconventional anomalous Hall effect (AHE) and is linear above saturation despite a large MR. We propose that complex structures at magnetic domain walls may be responsible for the hysteretic MR and may also lead to the AHE.Geometric frustration in magnetic systems arises from competing magnetic interactions that cannot be satisfied simultaneously and leads to a variety of exotic ground states [1]. While insulating frustrated materials are well studied, metallic systems have received less attention [2]. In metallic materials, the conduction electrons mediate interactions between the magnetic moments. Additionally, the transport properties in such systems can be strongly influenced by the magnetic structure [1]. This interplay between magnetism and charge can be exploited in two ways: to engineer a highly field tunable response of the transport properties [3] or to use transport experiments as an indirect probe of the complex magnetic structures that arise in such systems [4,5].The rare earth tetraboride family (RB 4 , R is a rare earth) is a series of metallic frustrated magnets. RB 4 crystallizes in a tetragonal structure (space group P4/mbm, 127) [6], consisting of alternating layers of R and B ions (Fig 1(a)). The R ions form a frustrated Shastry-Sutherland lattice (SSL) with competing interactions J 1 and J 2 [7]. Quite remarkably, high resolution structural refinement of LaB 4 [8] and HoB 4 [9] show that the R-R bonds corresponding to J 1 and J 2 are equal in length, making the R-sublattice a rare physical realization of one of the eleven Archimedean lattices [10] (Fig. 1(b)). While other frustrated Archimedean lattices such as the triangular and Kagomé lattices are well studied [10,11], the RB 4 family is the only known realization of the Archimedean Shastry-Sutherland lattice.In this article, we use magnetization and transport experiments to study TmB 4 , a member of the RB 4 family that has attracted attention for its rich phase diagram [13][14][15][16] (Fig. 1(c)). Crystal field effects at the Tm

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Lanthanum tetraboride

Abstract: The structure, homotypic with that of CeB4, ThB4 and UB4, was refined by the least-squares method based on 520 X-ray diffraction intensities. The B-B distances range from 1.75 to 1.85 /k, the La-B distances from 2.818 to 3.155 A.

Cited by 23 publications

References 4 publications

Stability of 41 metal–boron systems at 0GPa and 30GPa from first principles

Stability of 41 metal–boron systems at 0GPa and 30GPa from first principles

Design and Synthesis of Clathrate LaB8 with Superconductivity

Hysteretic magnetoresistance and unconventional anomalous Hall effect in the frustrated magnetTmB4

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