Semi-Dirac States and Quantum Linear Magnetoresistance in Helimagnetic Pnictide MnP
Abstract
Large linear positive magnetoresistance (LPMR) in topological and magnetic materials remains a subject of intense debate, particularly in noncollinear spin systems where spin-dependent scattering complicates charge transport. Manganese phosphide (MnP), a helimagnetic binary pnictide with multiple field-induced magnetic transitions, provides a useful platform to investigate the interplay between complex magnetism and electronic topology. Here, we present a comprehensive experimental and theoretical investigation of phase-dependent magnetotransport in high-quality MnP single crystals. Hall measurements reveal an anomalous Hall effect dominated by skew scattering at high temperatures and a finite topological Hall effect in the noncollinear fan (FAN) and low-temperature screw (SCR) phases. At low temperatures, we observe a large, non-saturating LPMR reaching nearly 800 percent at 4 K and 15 T, with a pronounced linear field dependence in the field-polarized ferromagnetic (FM2) state. First-principles calculations reveal a strongly anisotropic semi-Dirac-like band at the Y point that progressively approaches the Fermi level from the SCR to FAN and FM2 states. Our analysis indicates that the resulting small Fermi pocket can access the extreme quantum-limit regime at experimentally accessible fields, providing a microscopic framework for the observed LPMR within Abrikosov's quantum magnetoresistance theory.
Related
- Observation of linear magnetoresistance and planar Hall effect in the Dirac semimetal PdTe
- Subdimensional linear-optical quantum computation: from qudit resource states to qubit quantum computation
- Extending the Pnictide Chemical Space for Photovoltaics
- Time-Multiplexed Generation of Linear Cluster States from a Solid-State Single-Photon Source
- Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum
BibTeX
@misc{chowdhury2026semidirac,
title = {{Semi-Dirac States and Quantum Linear Magnetoresistance in Helimagnetic Pnictide MnP}},
author = {Prasanta Chowdhury and Jyotirmoy Sau and Sanat Kumar Adhikari and Sourav Chowdhury and Peter Bencok and Matthias Gutmann and Souvik Chatterjee and Saurav Giri and Manoranjan Kumar and Subham Majumdar},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.09781},
eprint = {2609.09781},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.09781},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Semi-Dirac States and Quantum Linear Magnetoresistance in Helimagnetic Pnictide MnP
AU - Prasanta Chowdhury
AU - Jyotirmoy Sau
AU - Sanat Kumar Adhikari
AU - Sourav Chowdhury
AU - Peter Bencok
AU - Matthias Gutmann
AU - Souvik Chatterjee
AU - Saurav Giri
AU - Manoranjan Kumar
AU - Subham Majumdar
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2609.09781
UR - https://arxiv.org/abs/2609.09781
AB - Large linear positive magnetoresistance (LPMR) in topological and magnetic materials remains a subject of intense debate, particularly in noncollinear spin systems where spin-dependent scattering complicates charge transport. Manganese phosphide (MnP), a helimagnetic binary pnictide with multiple field-induced magnetic transitions, provides a useful platform to investigate the interplay between complex magnetism and electronic topology. Here, we present a comprehensive experimental and theoretical investigation of phase-dependent magnetotransport in high-quality MnP single crystals. Hall measurements reveal an anomalous Hall effect dominated by skew scattering at high temperatures and a finite topological Hall effect in the noncollinear fan (FAN) and low-temperature screw (SCR) phases. At low temperatures, we observe a large, non-saturating LPMR reaching nearly 800 percent at 4 K and 15 T, with a pronounced linear field dependence in the field-polarized ferromagnetic (FM2) state. First-principles calculations reveal a strongly anisotropic semi-Dirac-like band at the Y point that progressively approaches the Fermi level from the SCR to FAN and FM2 states. Our analysis indicates that the resulting small Fermi pocket can access the extreme quantum-limit regime at experimentally accessible fields, providing a microscopic framework for the observed LPMR within Abrikosov's quantum magnetoresistance theory.
ER -