Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Cooperative Phenomena and Phase Transitions (joint session MA/TT)

TT 6.4: Vortrag

Montag, 16. März 2020, 10:15–10:30, HSZ 401

Spin-lattice coupling in a Yafet-Kittel ferrimagnetic spinel — •Atsuhiko Miyata1,2, Hidemaro Suwa3, Toshihiro Nomura2, Lilian Prodan4, Viorel Felea2,4,5, Yurii Skourski2, Joachim Deisenhofer6, Hans-Albrecht Krug von Nidda6, Oliver Portugall1, Sergei Zherlitsyn2, Vladimir Tsurkan4,6, Joachim Wosnitza2,5, and Alois Loidl61LNCMI, Toulouse, France — 2HLD-HZDR, Dresden Germany — 3University of Tokyo, Tokyo, Japan — 4Institute of Applied Physics, Chisinau, Moldova — 5TU Dresden, Dresden, Germany — 6University of Augsburg, Augsburg, Germany

Since the discovery of ferrimagnetism in 1948, noncollinear ferrimagnets have been well studied in spinels, AB2X4. The key essence is the competition of magnetic exchanges within or between the two A and B lattices. Yafet and Kittel (YK) proposed a model for triangular-structure ground states. To realize unconventional ferrimagnetic structures beyond the YK model, one can consider that spontaneous lattice deformation will modulate these main antiferromagnetic exchanges, i.e., through a spin-lattice coupling mechanism. This kind of spin-lattice coupling mechanism, however, has not been taken into account in previous theoretical works on ferrimagnetic spinels.

In this talk, using ultrasound and magnetostriction results up to 60 T, magnetization measurements up to 110 T, and Monte Carlo calculations, we demonstrate that the spin-lattice coupling induces unconventional magnetic structures under magnetic fields in the YK spinel MnCr2S4.

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