# YbBiPt

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**YbBiPt** (ytterbium-bismuth-platinum; also named YbPtBi) is an [intermetallic material](/source/Intermetallic_material) which at low temperatures exhibits an extremely high value of [specific heat](/source/Specific_heat_capacity), which is a characteristic of [heavy-fermion](/source/Heavy_fermion_material) behavior. YbBiPt has a [noncentrosymmetric](/source/Non-centrosymmetric) cubic [crystal structure](/source/Crystal_structure); in particular it belongs to the ternary [half-Heusler compounds](/source/Heusler_compound#Half-Heusler_thermoelectrics).

## Discovery

YbBiPt was discovered by [Zachary Fisk](/source/Zachary_Fisk) ([Los Alamos National Laboratory](/source/Los_Alamos_National_Laboratory)) and coworkers in 1991 in the context of material research devoted to correlated electron systems such as [heavy-fermion metals](/source/Heavy_fermion_material) and [Kondo insulators](/source/Kondo_insulator).[1][2] Then the material was studied in detail due to its unconventional properties at very low temperatures (below 1 K).

## Material properties

YbBiPt crystallizes in the MgAgAs [structure](/source/Crystal_structure), which is also known as the half-Heusler structure. YbBiPt exhibits metallic behavior, e.g. continuously decreasing [electrical resistivity](/source/Electrical_resistivity_and_conductivity) upon cooling. The temperature dependence of the specific heat shows an anomaly at 0.4K and linear behavior at yet lower temperatures with the enormous Sommerfeld coefficient (which describes the linear-in-temperature contribution to the specific heat caused by metallic electrons) of 8J/(mol Yb K2),[1] which indicates an effective mass of the charge carriers that is extremely large even for [heavy-fermion](/source/Heavy_fermion_material) standards.

## Larger context

The crystal structure of YbBiPt makes it an example of the [Heusler compounds](/source/Heusler_alloy),[3] more precisely of the so-called half-Heuslers which have XYZ composition.[3] In recent years, there has been a large interest in this material class due to the large variety of physical properties that can be found, and many new Heusler materials have been discovered.[3]

## References

1. Fisk, Z. et al. (1991). ["Massive Electron State in YbBiPt"](https://escholarship.org/uc/item/2pk7z8d7). *Phys. Rev. Lett.*. **67** (23): 3310–3313. [Bibcode:1991PhRvL..67.3310F](https://ui.adsabs.harvard.edu/abs/1991PhRvL..67.3310F). [doi:10.1103/PhysRevLett.67.3310](https://doi.org/10.1103/PhysRevLett.67.3310). [PMID 10044700](https://pubmed.ncbi.nlm.nih.gov/10044700). [S2CID 32812392](https://api.semanticscholar.org/CorpusID:32812392)

1. Canfield, P.C. et al. (1991). ["Magnetism and heavy fermion-like behavior in the RBiPt series"](https://works.bepress.com/paul_canfield/45/download/). *J. Appl. Phys.*. **70** (10): 5800. [Bibcode:1991JAP....70.5800C](https://ui.adsabs.harvard.edu/abs/1991JAP....70.5800C). [doi:10.1063/1.350141](https://doi.org/10.1063/1.350141). [S2CID 55237913](https://api.semanticscholar.org/CorpusID:55237913)

1. Chadov, Stanislav; Qi, Xiaoliang; Kübler, Jürgen; Fecher, Gerhard H.; Felser, Claudia; Zhang, Shou Cheng (July 2010). "Tunable multifunctional topological insulators in ternary Heusler compounds". *Nature Materials*. **9** (7): 541–545. [arXiv:1003.0193](https://arxiv.org/abs/1003.0193). [Bibcode:2010NatMa...9..541C](https://ui.adsabs.harvard.edu/abs/2010NatMa...9..541C). [doi:10.1038/nmat2770](https://doi.org/10.1038/nmat2770). [PMID 20512154](https://pubmed.ncbi.nlm.nih.gov/20512154). [S2CID 32178219](https://api.semanticscholar.org/CorpusID:32178219)

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