Berlin 2024 – wissenschaftliches Programm
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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 Nakatsuji3,5 — 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