Enhancement of the Magnetoresistance in the Mobility-Engineered Compensated Metal Pt5P2

Alex H. Mayo; Hidefumi Takahashi; Shintaro Ishiwata; Karolina Górnicka; Michał J. Winiarski; Jan Jaroszynski; Robert J. Cava; Weiwei Xie; Tomasz Klimczuk

doi:10.1002/aelm.202201120

Enhancement of the Magnetoresistance in the Mobility-Engineered Compensated Metal Pt₅P₂

Alex H. Mayo
, Hidefumi Takahashi
, Shintaro Ishiwata
, Karolina Górnicka
, Michał J. Winiarski
, Jan Jaroszynski
, Robert J. Cava
, Weiwei Xie
, Tomasz Klimczuk

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The magnetoresistance (MR) in nonmagnetic materials continues to be a fertile research area in materials science. The search for giant, positive MR has been limited to a rather small window of materials such as high-mobility semimetals in single-crystalline form. Here, the observation of a very large positive MR in metallic Pt₅P₂ in polycrystalline form is reported. The observations reveal that improvement of the crystallinity results in a significant enhancement of the positive MR, exceeding 10 000% at 9 T, comparable to high-mobility semimetals. Based on first-principles calculations combined with magnetotransport and thermoelectric measurements, the Fermi surface of Pt₅P₂ is found to consist of a collection of multiple electron and hole pockets compensating one another, along with a characteristic pocket continuously connected to the adjacent Brillouin zone, together with possible topologically protected band crossings. This work extends the landscape of high MR candidate materials to polycrystalline metals, which demonstrates the importance of crystallinity and purity of the samples for the optimization of the MR.

Original language	English
Article number	2201120
Journal	Advanced Electronic Materials
Volume	9
Issue number	3
DOIs	https://doi.org/10.1002/aelm.202201120
State	Published - Mar 2023
Externally published	Yes

Funding

The work at Gdansk Tech. was supported by the National Science Centre (Poland; grant No. 2018/30/M/ST5/00773). The work at Princeton was supported by the Gordon and Betty Moore Foundation (grant No. GBMF‐9066), and by the DOE‐ BES‐funded Co‐design Center for Quantum Advantage (grant No. DE‐SC0012704). The work at MSU was supported by Beckman Young Investigator Award. The work at Osaka was supported by JSPS, KAKENHI (grant Nos. 21H01030 and 22H00343), and Murata Foundation. The part performed at NHMFL has been supported by NSF DMR‐1644779 and the State of Florida. A.H.M. was supported by the Program for Leading Graduate Schools “World‐leading Innovative Graduate Study Program for Materials Research, Industry and Technology (MERIT‐WINGS)” of the University of Tokyo. The work at Gdansk Tech. was supported by the National Science Centre (Poland; grant No. 2018/30/M/ST5/00773). The work at Princeton was supported by the Gordon and Betty Moore Foundation (grant No. GBMF-9066), and by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under Contract No. DE-SC0012704). The work at MSU was supported by Beckman Young Investigator Award. The work at Osaka was supported by JSPS, KAKENHI (grant Nos. 21H01030 and 22H00343), and Murata Foundation. The part performed at NHMFL has been supported by NSF DMR-1644779 and the State of Florida. A.H.M. was supported by the Program for Leading Graduate Schools “World-leading Innovative Graduate Study Program for Materials Research, Industry and Technology (MERIT-WINGS)” of the University of Tokyo. Note: The acknowledgements were corrected on March 10, 2023, after initial publication online.

Keywords

giant magnetoresistance
magnetotransport measurements
polycrystalline compounds
thermoelectric measurements

Access to Document

10.1002/aelm.202201120

Cite this

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title = "Enhancement of the Magnetoresistance in the Mobility-Engineered Compensated Metal Pt5P2",

abstract = "The magnetoresistance (MR) in nonmagnetic materials continues to be a fertile research area in materials science. The search for giant, positive MR has been limited to a rather small window of materials such as high-mobility semimetals in single-crystalline form. Here, the observation of a very large positive MR in metallic Pt5P2 in polycrystalline form is reported. The observations reveal that improvement of the crystallinity results in a significant enhancement of the positive MR, exceeding 10 000\% at 9 T, comparable to high-mobility semimetals. Based on first-principles calculations combined with magnetotransport and thermoelectric measurements, the Fermi surface of Pt5P2 is found to consist of a collection of multiple electron and hole pockets compensating one another, along with a characteristic pocket continuously connected to the adjacent Brillouin zone, together with possible topologically protected band crossings. This work extends the landscape of high MR candidate materials to polycrystalline metals, which demonstrates the importance of crystallinity and purity of the samples for the optimization of the MR.",

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author = "Mayo, \{Alex H.\} and Hidefumi Takahashi and Shintaro Ishiwata and Karolina G{\'o}rnicka and Winiarski, \{Micha{\l} J.\} and Jan Jaroszynski and Cava, \{Robert J.\} and Weiwei Xie and Tomasz Klimczuk",

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year = "2023",

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AU - Mayo, Alex H.

AU - Takahashi, Hidefumi

AU - Ishiwata, Shintaro

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AU - Winiarski, Michał J.

AU - Jaroszynski, Jan

AU - Cava, Robert J.

AU - Xie, Weiwei

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N2 - The magnetoresistance (MR) in nonmagnetic materials continues to be a fertile research area in materials science. The search for giant, positive MR has been limited to a rather small window of materials such as high-mobility semimetals in single-crystalline form. Here, the observation of a very large positive MR in metallic Pt5P2 in polycrystalline form is reported. The observations reveal that improvement of the crystallinity results in a significant enhancement of the positive MR, exceeding 10 000% at 9 T, comparable to high-mobility semimetals. Based on first-principles calculations combined with magnetotransport and thermoelectric measurements, the Fermi surface of Pt5P2 is found to consist of a collection of multiple electron and hole pockets compensating one another, along with a characteristic pocket continuously connected to the adjacent Brillouin zone, together with possible topologically protected band crossings. This work extends the landscape of high MR candidate materials to polycrystalline metals, which demonstrates the importance of crystallinity and purity of the samples for the optimization of the MR.

AB - The magnetoresistance (MR) in nonmagnetic materials continues to be a fertile research area in materials science. The search for giant, positive MR has been limited to a rather small window of materials such as high-mobility semimetals in single-crystalline form. Here, the observation of a very large positive MR in metallic Pt5P2 in polycrystalline form is reported. The observations reveal that improvement of the crystallinity results in a significant enhancement of the positive MR, exceeding 10 000% at 9 T, comparable to high-mobility semimetals. Based on first-principles calculations combined with magnetotransport and thermoelectric measurements, the Fermi surface of Pt5P2 is found to consist of a collection of multiple electron and hole pockets compensating one another, along with a characteristic pocket continuously connected to the adjacent Brillouin zone, together with possible topologically protected band crossings. This work extends the landscape of high MR candidate materials to polycrystalline metals, which demonstrates the importance of crystallinity and purity of the samples for the optimization of the MR.

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