Journal Article

FZJ-2023-02085

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Incommensurate antiferromagnetic order in CePtAl 3

Stekiel, M. (Corresponding author)FZJ* ; Čermák, P. ; Franz, C.FZJ* ; Simeth, W. ; Weber, S. ; Ressouche, E. ; Schmidt, W.FZJ* ; Nemkovski, K. ; Deng, H.RWTH*FZJ* ; Bauer, A. ; Pfleiderer, C. ; Schneidewind, A. (Last author)FZJ*

2023
APS College Park, MD

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Please use a persistent id in citations: http://hdl.handle.net/2128/34465  doi:10.1103/PhysRevResearch.5.013058

Abstract: We report on a neutron diffraction study of single-crystal CePtAl3 complemented by measurements of the specific heat under applied magnetic field. Below TN ≈ 3 K, CePtAl3 develops incommensurate antiferromagneticorder with a single modulation vector k = (0.676 0 0). Residual magnetic scattering intensity above TN and a broadening of the specific heat anomaly at TN may be consistently described in terms of a Gaussiandistribution of transition temperatures with a standard deviation σ ≈ 0.5 K. The distribution of TN may be attributed to the observation of occupational and positional disorder between the Pt and Al sites consistent withstructural information inferred from neutron diffraction. Measurements under magnetic field reveal changes of the magnetic domain populations when the field is applied along the [0 1 0] direction consistent with a transitionfrom cycloidal to amplitude-modulated magnetic order ∼2.5 T.

Keyword(s): Magnetic Materials (1st) ; Magnetism (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)
4. JCNS-4 (JCNS-4)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
3. TOPFIT - Topological Spin Solitons for Information Technology (291079) (291079)
4. ExQuiSid - Extreme Quantum Matter in Solids (788031) (788031)
5. DFG project 390814868 - EXC 2111: Munich Center for Quantum Science and Technology (MCQST) (390814868) (390814868)
6. DFG project 360506545 - SPP 2137: Skyrmionics: Topologische Spin-Phänomene im Realraum für Anwendungen (360506545) (360506545)
7. DFG project 164354662 - Stabilisierung magnetischer Ordnung unter extremen Bedingungen (F02 (A06)) (164354662) (164354662)
8. DFG project 323760292 - Mehrkomponentige Elektronische Korrelationen in Nicht-Zentrosymmetrischen f-Elektron-Verbindungen (323760292) (323760292)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)
2. DNS: Diffuse scattering neutron time of flight spectrometer (NL6S)
3. POLI: Polarized hot neutron diffractometer (SR9a)

Appears in the scientific report 2023

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