Ground state magnetic structure of axion insulator candidates EuIn2As2 and EuIn2P2.
Axions particles are excitations of a quantum field that has been proposed 40 years ago to reconcile a key problem with the current standard model of particle physics. This proposal relates to the search for condensed matter systems that can harbor axions, which have not yet been observed in vacuum. Very recently, the layered antiferromagnets EuIn2As2 and EuIn2P2 were proposed as examples of crystalline materials that can host axion-like quasi-particles. However, the true ground state magnetic structure of these materials, crucial for the stabilization of axions, remain ambiguous. We aim to perform careful spherical neutron polarimetry measurements with the CRYOPAD to elucidate if the Eu moments display the proposed "broken" helix magnetic order. The results will establish whether or not EuIn2As2 and EuIn2P2 can host axion quasi-particles.
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JIAN-RUI SOH; BOOTHROYD Andrew Timothy; PRABHAKARAN Dharmalingam; STUNAULT Anne and Siobhan M. Tobin. (2021). Ground state magnetic structure of axion insulator candidates EuIn2As2 and EuIn2P2.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1176
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