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TT: Fachverband Tiefe Temperaturen

TT 65: Frustrated Magnets: General I

TT 65.3: Vortrag

Donnerstag, 21. März 2024, 10:00–10:15, H 2053

Investigation of magnetoelastic couplings on pyrochlore lattices up to B=162T saturation magnetic fields — •Nan Tang¹, Masaki Gen², Huiyuan Man³, Kazuyuki Matsuhira⁴, Akira Matsuo⁵, Koichi Kindo⁵, Akihiko Ikeda⁶, Yasuhiro H. Matsuda⁵, Philipp Gegenwart¹, Yoshimitsu Kohama⁵, and Satoru Nakatsuji^3,5 — ¹Universität Augsburg, Augsburg, Germany — ²RIKEN Center for Emergent Matter Science, Saitama,Japan — ³The Johns Hopkins University, Maryland, USA — ⁴Kyushu Institute of Technology, Fukuoka, Japan — ⁵University of Tokyo, Chiba, Japan — ⁶University of Electro-Communications, Tokyo, Japan

Magnetoelastic couplings are interesting due to their ability to generate nontrivial phenomena both of fundamental interest and technological significance. Hence, a comprehensive study based on both experiments and simulations acts as a valuable guide in disentangling the mechanism underlying material deformation. We will discuss magnetization and magnetostriction of two spin ices Ho₂Ti₂O₇ and Pr₂Zr₂O₇ up to B=162 T. For Ho₂Ti₂O₇, Δ L(B) passes a maximum around 40 T, in contrast to the monotonic behaviour of Pr₂Zr₂O₇. Our model based on point-charges and Born von Karman springs calculates the crystal-field striction and exchange striction, respectively, and the sum could explain the experiments well. These results showcase that magnetoelasticity in complicated frustrated magnets can be unraveled by very simple models.

Keywords: magnetoelastic coupling; pyrochlores; spin ice; high magnetic field; magnetostriction