Journal Article

PUBDB-2026-00777

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Inducing Ferroquadrupolar Order with Applied Magnetic Field in $TbPO_4$

Forino, P. C. (Corresponding author)Extern* ; Jensen, J. ; Soh, J. R.Extern* ; Francoual, S.DESY* ; Zaharko, O. ; Sloth, S. ; Turrini, A. ; Feyerherm, R. ; Prokes, K. ; Holm-Janas, S. ; Zivkovic, I. ; Liu, Y. ; Magrez, A. ; Christensen, N. J.Extern*EMBL* ; Rønnow, H. M. ; Toft-Petersen, R. (Corresponding author)

2026
American Physical Society College Park, Md.

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Please use a persistent id in citations: doi:10.1103/bhgt-jkj7  doi:10.3204/PUBDB-2026-00777

Abstract: In this work, we demonstrate a remarkable field-induced ferroquadrupolar phase emanating from the magnetoelastic coupling. Using synchrotron x-ray and neutron diffraction, heat capacity measurements, as well as mean-field modeling, we show that above the critical magnetic field, ferroquadrupolar $O$$_2$$^{-2}$order is stabilized as the main order parameter, in competition with the field-induced magnetic polarization. This is revealed by a severe lattice distortion and the suppression of antiferromagnetic ordering of the dipole moments. Even in zero magnetic field, the previously reported antiferromagnetic order is a mixed quadrupolar-dipolar phase, further highlighting the crucial role of spin-lattice interactions. This complete understanding of the magnetoelastic phase diagram establishes ${TbPO}$$_4$as a model system for studying nematic-antiferromagnetic transitions and provides key Hamiltonian parameters for its description.

Note: Grant Agreement No. 35921; SNRF 200020-188648; Danish Agency for Science, Technology, and Innovation through Grant No. 7129-00006B;

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20210985 EC (I-20210985-EC) (I-20210985-EC)
4. HERO - Hidden, entangled and resonating orders (810451) (810451)

Experiment(s):

1. PETRA Beamline P09 (PETRA III)
2. Measurement at external facility

Appears in the scientific report 2026

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