Observation of large negative magnetoresistance in the noncentrosymmetric compound PrPtSi

Michael O. Ogunbunmi; André M. Strydom

doi:10.1016/j.jallcom.2021.159708

Observation of large negative magnetoresistance in the noncentrosymmetric compound PrPtSi

Michael O. Ogunbunmi, André M. Strydom

Physics

University of Johannesburg

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

1 Citation (Scopus)

Abstract

We report the magnetotransport and thermodynamic properties of PrPtSi which crystallizes with the noncentrosymmetric LaPtSi-type structure (space group: I4₁md). Signatures from specific heat and magnetic susceptibility reveal an anomaly at T* ≃ 5.5 K which is attributed to crystal field effects. We find a negative magnetoresistance whose magnitude grows with decreasing temperature, with a value of −17.4% at 1.9 K and in 7 T. Results from the electronic-derived specific heat C_4f reveal an upturn in C_4f(T)/T at low temperature and traces a −logT dependence, attaining values of 1.1 J/(mol K²) and 3.6 J/(mol K²) at 0.38 K in zero and 4 T, respectively.

Original language	English
Article number	159708
Journal	Journal of Alloys and Compounds
Volume	873
DOIs	https://doi.org/10.1016/j.jallcom.2021.159708
Publication status	Published - 25 Aug 2021

Keywords

Crystal electric field
Heavy-fermion behavior
Kondo effect
LaPtSi-type structure
Negative magnetoresistance
PrPtSi

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2021.159708

Cite this

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title = "Observation of large negative magnetoresistance in the noncentrosymmetric compound PrPtSi",

abstract = "We report the magnetotransport and thermodynamic properties of PrPtSi which crystallizes with the noncentrosymmetric LaPtSi-type structure (space group: I41md). Signatures from specific heat and magnetic susceptibility reveal an anomaly at T* ≃ 5.5 K which is attributed to crystal field effects. We find a negative magnetoresistance whose magnitude grows with decreasing temperature, with a value of −17.4% at 1.9 K and in 7 T. Results from the electronic-derived specific heat C4f reveal an upturn in C4f(T)/T at low temperature and traces a −logT dependence, attaining values of 1.1 J/(mol K2) and 3.6 J/(mol K2) at 0.38 K in zero and 4 T, respectively.",

keywords = "Crystal electric field, Heavy-fermion behavior, Kondo effect, LaPtSi-type structure, Negative magnetoresistance, PrPtSi",

author = "Ogunbunmi, {Michael O.} and Strydom, {Andr{\'e} M.}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = aug,

day = "25",

doi = "10.1016/j.jallcom.2021.159708",

language = "English",

volume = "873",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

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TY - JOUR

T1 - Observation of large negative magnetoresistance in the noncentrosymmetric compound PrPtSi

AU - Ogunbunmi, Michael O.

AU - Strydom, André M.

PY - 2021/8/25

Y1 - 2021/8/25

N2 - We report the magnetotransport and thermodynamic properties of PrPtSi which crystallizes with the noncentrosymmetric LaPtSi-type structure (space group: I41md). Signatures from specific heat and magnetic susceptibility reveal an anomaly at T* ≃ 5.5 K which is attributed to crystal field effects. We find a negative magnetoresistance whose magnitude grows with decreasing temperature, with a value of −17.4% at 1.9 K and in 7 T. Results from the electronic-derived specific heat C4f reveal an upturn in C4f(T)/T at low temperature and traces a −logT dependence, attaining values of 1.1 J/(mol K2) and 3.6 J/(mol K2) at 0.38 K in zero and 4 T, respectively.

AB - We report the magnetotransport and thermodynamic properties of PrPtSi which crystallizes with the noncentrosymmetric LaPtSi-type structure (space group: I41md). Signatures from specific heat and magnetic susceptibility reveal an anomaly at T* ≃ 5.5 K which is attributed to crystal field effects. We find a negative magnetoresistance whose magnitude grows with decreasing temperature, with a value of −17.4% at 1.9 K and in 7 T. Results from the electronic-derived specific heat C4f reveal an upturn in C4f(T)/T at low temperature and traces a −logT dependence, attaining values of 1.1 J/(mol K2) and 3.6 J/(mol K2) at 0.38 K in zero and 4 T, respectively.

KW - Crystal electric field

KW - Heavy-fermion behavior

KW - Kondo effect

KW - LaPtSi-type structure

KW - Negative magnetoresistance

KW - PrPtSi

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U2 - 10.1016/j.jallcom.2021.159708

DO - 10.1016/j.jallcom.2021.159708

M3 - Article

AN - SCOPUS:85104366046

SN - 0925-8388

VL - 873

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 159708

ER -

Observation of large negative magnetoresistance in the noncentrosymmetric compound PrPtSi

Abstract

Keywords

ASJC Scopus subject areas

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