A New Magnetic Topological Quantum Material Candidate by Design

Xin Gui, Ivo Pletikosic, Huibo Cao, Hung Ju Tien, Xitong Xu, Ruidan Zhong, Guangqiang Wang, Tay-Rong Chang, Shuang Jia, Tonica Valla, Weiwei Xie, Robert J. Cava

Research output: Contribution to journalArticle

Abstract

Magnetism, when combined with an unconventional electronic band structure, can give rise to forefront electronic properties such as the quantum anomalous Hall effect, axion electrodynamics, and Majorana fermions. Here we report the characterization of high-quality crystals of EuSn 2 P 2 , a new quantum material specifically designed to engender unconventional electronic states plus magnetism. EuSn 2 P 2 has a layered, Bi 2 Te 3 -type structure. Ferromagnetic interactions dominate the Curie-Weiss susceptibility, but a transition to antiferromagnetic ordering occurs near 30 K. Neutron diffraction reveals that this is due to two-dimensional ferromagnetic spin alignment within individual Eu layers and antiferromagnetic alignment between layers - this magnetic state surrounds the Sn-P layers at low temperatures. The bulk electrical resistivity is sensitive to the magnetism. Electronic structure calculations reveal that EuSn 2 P 2 might be a strong topological insulator, which can be a new magnetic topological quantum material (MTQM) candidate. The calculations show that surface states should be present, and they are indeed observed by angle-resolved photoelectron spectroscopy (ARPES) measurements.

Original languageEnglish
JournalACS Central Science
DOIs
Publication statusPublished - 2019 Jan 1

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Magnetism
Quantum Hall effect
Fermions
Electrodynamics
Surface states
Electronic states
Neutron diffraction
Photoelectron spectroscopy
Electronic properties
Band structure
Electronic structure
Crystals
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Gui, X., Pletikosic, I., Cao, H., Tien, H. J., Xu, X., Zhong, R., ... Cava, R. J. (2019). A New Magnetic Topological Quantum Material Candidate by Design. ACS Central Science. https://doi.org/10.1021/acscentsci.9b00202
Gui, Xin ; Pletikosic, Ivo ; Cao, Huibo ; Tien, Hung Ju ; Xu, Xitong ; Zhong, Ruidan ; Wang, Guangqiang ; Chang, Tay-Rong ; Jia, Shuang ; Valla, Tonica ; Xie, Weiwei ; Cava, Robert J. / A New Magnetic Topological Quantum Material Candidate by Design. In: ACS Central Science. 2019.
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Gui, X, Pletikosic, I, Cao, H, Tien, HJ, Xu, X, Zhong, R, Wang, G, Chang, T-R, Jia, S, Valla, T, Xie, W & Cava, RJ 2019, 'A New Magnetic Topological Quantum Material Candidate by Design', ACS Central Science. https://doi.org/10.1021/acscentsci.9b00202

A New Magnetic Topological Quantum Material Candidate by Design. / Gui, Xin; Pletikosic, Ivo; Cao, Huibo; Tien, Hung Ju; Xu, Xitong; Zhong, Ruidan; Wang, Guangqiang; Chang, Tay-Rong; Jia, Shuang; Valla, Tonica; Xie, Weiwei; Cava, Robert J.

In: ACS Central Science, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Wang, Guangqiang

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AU - Xie, Weiwei

AU - Cava, Robert J.

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