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Title: Evidence of Ba-substitution induced spin-canting in the magnetic Weyl semimetal EuCd 2As 2

Abstract

Recently EuCd 2As 2 was predicted to be a magnetic Weyl semimetal with a lone pair of Weyl nodes generated by A-type antiferromagnetism and protected by a rotational symmetry. However, it was soon discovered that the actual magnetic structure broke the rotational symmetry and internal pressure was later suggested as a route to stabilize the desired magnetic state. In this work we test this prediction by synthesizing a series of Eu 1-xBaxCd 2As 2 single crystals and studying their structural, magnetic, and transport properties via both experimental techniques and first-principles calculations. We find that small concentrations of Ba (~3%–10%) lead to a small out-of-plane canting of the Eu moment. However, for higher concentrations this effect is suppressed and a nearly in-plane model is recovered. Studying the transport properties we find that all compositions show evidence of an anomalous Hall effect dominated by the intrinsic mechanism as well as large negative magnetoresistances in the longitudinal channel. A nonmonotonic evolution of the transport properties is seen across the series which correlates to the proposed canting suggesting canting may enhance the topological effects. Careful density functional theory calculations using an all-electron approach revise prior predictions finding a purely ferromagnetic ground state with in-planemore » moments for both the EuCd 2As 2 and Eu 0.5Ba 0.5Cd 2As 2 compounds, corroborating our experimental findings. This work suggests that Ba substitution can tune the magnetic properties in unexpected ways which correlate to changes in measures of topological properties, encouraging future work to locate the ideal Ba concentration for Eu moment canting.« less

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1661200
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 102; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Sanjeewa, Liurukara D., Xing, Jie, Taddei, Keith, Parker, David S., Custelcean, Radu, Dela Cruz, Clarina R., and Sefat, Athena Safa. Evidence of Ba-substitution induced spin-canting in the magnetic Weyl semimetal EuCd2As2. United States: N. p., 2020. Web. doi:10.1103/physrevb.102.104404.
Sanjeewa, Liurukara D., Xing, Jie, Taddei, Keith, Parker, David S., Custelcean, Radu, Dela Cruz, Clarina R., & Sefat, Athena Safa. Evidence of Ba-substitution induced spin-canting in the magnetic Weyl semimetal EuCd2As2. United States. doi:10.1103/physrevb.102.104404.
Sanjeewa, Liurukara D., Xing, Jie, Taddei, Keith, Parker, David S., Custelcean, Radu, Dela Cruz, Clarina R., and Sefat, Athena Safa. Wed . "Evidence of Ba-substitution induced spin-canting in the magnetic Weyl semimetal EuCd2As2". United States. doi:10.1103/physrevb.102.104404.
@article{osti_1661200,
title = {Evidence of Ba-substitution induced spin-canting in the magnetic Weyl semimetal EuCd2As2},
author = {Sanjeewa, Liurukara D. and Xing, Jie and Taddei, Keith and Parker, David S. and Custelcean, Radu and Dela Cruz, Clarina R. and Sefat, Athena Safa},
abstractNote = {Recently EuCd2As2 was predicted to be a magnetic Weyl semimetal with a lone pair of Weyl nodes generated by A-type antiferromagnetism and protected by a rotational symmetry. However, it was soon discovered that the actual magnetic structure broke the rotational symmetry and internal pressure was later suggested as a route to stabilize the desired magnetic state. In this work we test this prediction by synthesizing a series of Eu1-xBaxCd2As2 single crystals and studying their structural, magnetic, and transport properties via both experimental techniques and first-principles calculations. We find that small concentrations of Ba (~3%–10%) lead to a small out-of-plane canting of the Eu moment. However, for higher concentrations this effect is suppressed and a nearly in-plane model is recovered. Studying the transport properties we find that all compositions show evidence of an anomalous Hall effect dominated by the intrinsic mechanism as well as large negative magnetoresistances in the longitudinal channel. A nonmonotonic evolution of the transport properties is seen across the series which correlates to the proposed canting suggesting canting may enhance the topological effects. Careful density functional theory calculations using an all-electron approach revise prior predictions finding a purely ferromagnetic ground state with in-plane moments for both the EuCd2As2 and Eu0.5Ba0.5Cd2As2 compounds, corroborating our experimental findings. This work suggests that Ba substitution can tune the magnetic properties in unexpected ways which correlate to changes in measures of topological properties, encouraging future work to locate the ideal Ba concentration for Eu moment canting.},
doi = {10.1103/physrevb.102.104404},
journal = {Physical Review B},
issn = {2469-9950},
number = 10,
volume = 102,
place = {United States},
year = {2020},
month = {9}
}

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