Journal Article

FZJ-2019-04659

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unambiguous determination of the commensurate antiferromagnetic structure of HoNi 2 B 2 C in the superconducting ground state

Sazonov, A. (Corresponding author)FZJ* ; Hutanu, V.FZJ* ; Meven, M.FZJ* ; Röwer, K. ; Roth, G. ; Lelièvre-Berna, E. ; Fuchs, G. ; Zaharko, O. ; Friese, K.FZJ*

2019
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/22760  doi:10.1103/PhysRevB.100.014414

Abstract: Crystal and magnetic structures of the intermetallic HoNi2B2C have been investigated using different single-crystal diffraction techniques at both room and low temperatures (superconducting phase). Combined refinement of the neutron and x-ray diffraction data performed at room temperature shows that the crystal structure of HoNi2B2C is well described in the tetragonal space group I4/mmm, in agreement with the literature. The magnetic ordering at low temperatures is accompanied by a structural phase transition to the orthorhombic space group Fmmm. However, only noncharacteristic orbits are occupied in this space group, and the symmetry reduction is entirely due to a lifting of the symmetry-induced restrictions on the anisotropic displacement parameters. Based on magnetic symmetry analysis, two types of commensurate antiferromagnetic structures with different magnetic space groups (MSGs) are found below TN≈5.2 K: MSG PInnm (Ho spins are along the [100] direction of the parent structure) and MSG CAmca (Ho spins are along [110] of the parent structure). Both models agree well with conventional unpolarized neutron diffraction data at low temperature (2.4 K) with ordered magnetic moments of 9.16(9) μB/Ho3+ atom. Spherical neutron polarimetry, on the other hand, allowed us to unambiguously solve the magnetic structure (MSG CAmca) as well as to determine the population of two types of 90∘ antiferromagnetic domains (0.45/0.55).

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd) ; Crystallography (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)
3. Streumethoden (JCNS-2)

Research Program(s):

1. 524 - Controlling Collective States (POF3-524) (POF3-524)
2. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
3. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
4. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. HEiDi: Single crystal diffractometer on hot source (SR9b)
2. POLI: Polarized hot neutron diffractometer (SR9a)

Appears in the scientific report 2019

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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