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Title: Strain-induced spontaneous Hall effect in an epitaxial thin film of a Luttinger semimetal

Abstract

Pyrochlore iridates have offered a plethora of novel phenomena owing to the combination of topology and correlation. Among them, much attention has been paid to P r 2 I r 2 O 7 , as it is known as a Luttinger semimetal characterized by quadratic band touching at the Brillouin zone center, suggesting that the topology of its electronic states can be tuned by a moderate lattice strain and external magnetic field. In this work, we report that our epitaxial P r 2 I r 2 O 7 thin films grown by solid-state epitaxy exhibit a spontaneous Hall effect that persists up to 50 K without having spontaneous magnetization within our experimental accuracy. This indicates that the system breaks the time reversal symmetry at a temperature scale that is too high for the magnetism to be due to Pr 4f moments and must be related to magnetic order of the iridium 5d electrons. Moreover, our analysis finds that the chiral anomaly induces the negative contribution to the magnetoresistance only when a magnetic field and the electric current are parallel to each other. Our findings suggest that the strained part of the thin film forms a magnetic Weyl semimetal state.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]
  1. Univ. of Tokyo (Japan)
  2. Univ. of Tokyo (Japan); Japan Science and Technology Agency (JST), Saitama (Japan); Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States). Energy Frontier Research Center (EFRC) Institute for Quantum Matter (IQM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566668
Grant/Contract Number:  
SC0019331
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 116; Journal Issue: 18; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; magnetic Weyl semimetal; spontaneous Hall effect; Luttinger semimetal

Citation Formats

Ohtsuki, Takumi, Tian, Zhaoming, Endo, Akira, Halim, Mario, Katsumoto, Shingo, Kohama, Yoshimitsu, Kindo, Koichi, Lippmaa, Mikk, and Nakatsuji, Satoru. Strain-induced spontaneous Hall effect in an epitaxial thin film of a Luttinger semimetal. United States: N. p., 2019. Web. doi:10.1073/pnas.1819489116.
Ohtsuki, Takumi, Tian, Zhaoming, Endo, Akira, Halim, Mario, Katsumoto, Shingo, Kohama, Yoshimitsu, Kindo, Koichi, Lippmaa, Mikk, & Nakatsuji, Satoru. Strain-induced spontaneous Hall effect in an epitaxial thin film of a Luttinger semimetal. United States. doi:10.1073/pnas.1819489116.
Ohtsuki, Takumi, Tian, Zhaoming, Endo, Akira, Halim, Mario, Katsumoto, Shingo, Kohama, Yoshimitsu, Kindo, Koichi, Lippmaa, Mikk, and Nakatsuji, Satoru. Mon . "Strain-induced spontaneous Hall effect in an epitaxial thin film of a Luttinger semimetal". United States. doi:10.1073/pnas.1819489116.
@article{osti_1566668,
title = {Strain-induced spontaneous Hall effect in an epitaxial thin film of a Luttinger semimetal},
author = {Ohtsuki, Takumi and Tian, Zhaoming and Endo, Akira and Halim, Mario and Katsumoto, Shingo and Kohama, Yoshimitsu and Kindo, Koichi and Lippmaa, Mikk and Nakatsuji, Satoru},
abstractNote = {Pyrochlore iridates have offered a plethora of novel phenomena owing to the combination of topology and correlation. Among them, much attention has been paid to Pr2Ir2O7, as it is known as a Luttinger semimetal characterized by quadratic band touching at the Brillouin zone center, suggesting that the topology of its electronic states can be tuned by a moderate lattice strain and external magnetic field. In this work, we report that our epitaxial Pr2Ir2O7 thin films grown by solid-state epitaxy exhibit a spontaneous Hall effect that persists up to 50 K without having spontaneous magnetization within our experimental accuracy. This indicates that the system breaks the time reversal symmetry at a temperature scale that is too high for the magnetism to be due to Pr 4f moments and must be related to magnetic order of the iridium 5d electrons. Moreover, our analysis finds that the chiral anomaly induces the negative contribution to the magnetoresistance only when a magnetic field and the electric current are parallel to each other. Our findings suggest that the strained part of the thin film forms a magnetic Weyl semimetal state.},
doi = {10.1073/pnas.1819489116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 18,
volume = 116,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
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