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Crystallographic and magnetic structure of UNi$_4$$^{11}$B

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Title: Crystallographic and magnetic structure of UNi$_4$$^{11}$B
Authors: Willwater, J., Süllow, S., Reehuis, M., Feyerherm, R., Amitsuka, H., Ouladdiaf, B., Suard, E., Klicpera, M., Vališka, M., Pospíšil, J., Sechovský, V.
Source: Phys. Rev. B 103, 184426 (2021)
Publication Year: 2021
Collection: Condensed Matter
Subject Terms: Condensed Matter - Strongly Correlated Electrons
More Details: We present an extensive powder and single-crystal neutron scattering investigation of the crystallographic structure and magnetic order of the frustrated metallic $f$-electron magnet UNi$_4$B. We carry out a full refinement of the crystallographic structure and conclude that the low-temperature lattice symmetry is orthorhombic (space group Pmm2; cell parameters: $a = 6.963(4)~\r{A}$ , $b = 14.793(9)~\r{A}$ , $c = 17.126(8)~\r{A}$). We determine the magnetically ordered structure, concluding that below $T_\mathrm{N} = 19.5~\mathrm{K}$ the material undergoes a transition into a partially ordered antiferromagnetic state. The magnetic structure is consistent with the existence of toroidal order in this material. We further test the proposal of a second magnetic transition occurring at $330~\mathrm{mK}$, concluding that the thermodynamic anomalies observed at these temperatures do not reflect modifications of the magnetic structure. Our study provides a consistent picture of the interrelationship of structural and magnetic properties in the frustrated magnet UNi$_4$B previously unresolved.
Comment: Submitted to Phys. Rev. B
Document Type: Working Paper
DOI: 10.1103/PhysRevB.103.184426
Access URL: http://arxiv.org/abs/2104.06119
Accession Number: edsarx.2104.06119
Database: arXiv
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  Data: Crystallographic and magnetic structure of UNi$_4$$^{11}$B
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  Data: <searchLink fieldCode="AR" term="%22Willwater%2C+J%2E%22">Willwater, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Süllow%2C+S%2E%22">Süllow, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Reehuis%2C+M%2E%22">Reehuis, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Feyerherm%2C+R%2E%22">Feyerherm, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Amitsuka%2C+H%2E%22">Amitsuka, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Ouladdiaf%2C+B%2E%22">Ouladdiaf, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Suard%2C+E%2E%22">Suard, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Klicpera%2C+M%2E%22">Klicpera, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Vališka%2C+M%2E%22">Vališka, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Pospíšil%2C+J%2E%22">Pospíšil, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Sechovský%2C+V%2E%22">Sechovský, V.</searchLink>
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  Data: Phys. Rev. B 103, 184426 (2021)
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  Data: We present an extensive powder and single-crystal neutron scattering investigation of the crystallographic structure and magnetic order of the frustrated metallic $f$-electron magnet UNi$_4$B. We carry out a full refinement of the crystallographic structure and conclude that the low-temperature lattice symmetry is orthorhombic (space group Pmm2; cell parameters: $a = 6.963(4)~\r{A}$ , $b = 14.793(9)~\r{A}$ , $c = 17.126(8)~\r{A}$). We determine the magnetically ordered structure, concluding that below $T_\mathrm{N} = 19.5~\mathrm{K}$ the material undergoes a transition into a partially ordered antiferromagnetic state. The magnetic structure is consistent with the existence of toroidal order in this material. We further test the proposal of a second magnetic transition occurring at $330~\mathrm{mK}$, concluding that the thermodynamic anomalies observed at these temperatures do not reflect modifications of the magnetic structure. Our study provides a consistent picture of the interrelationship of structural and magnetic properties in the frustrated magnet UNi$_4$B previously unresolved.<br />Comment: Submitted to Phys. Rev. B
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