Otto Mustonen

Jeudi 13 novembre à 13h30 - Tuning quantum magnetism in double perovskites using non-magnetic cations

Otto MUSTONEN

Department of Chemistry and Materials Science, Aalto University, Finland

Abstract :

Quantum materials have magnetic or electronic properties arising from a non-trivial quantum mechanic origin and potential applications from energy to quantum computing [1]. Similarly, quantum magnets are magnetic materials with strong quantum effects and often unusual or exotic ground states. These typically arise in materials with low-dimensional interactions and low (“quantum”) spin on the magnetic cation such as S = 1/2 Cu²⁺ and V⁴⁺ or S = 1 Ni²⁺.

In this talk, I will show how non-magnetic d¹⁰ and d⁰ cation be used to tune magnetic interactions and ground states in double perovskites and related structures [2]. This is especially useful in quantum magnets, where new and exotic ground states can arise. The most exciting example of this is the Cu²⁺ double perovskite Sr₂CuTe_1-xWxO₆, where magnetic ordering is fully suppressed in a large composition range [3]. This represents the first observation of a spin-liquid-like state in a square-lattice antiferromagnet.

[1] R. Cava, N. de Leon, and W. Xie, Chem. Rev. 121, 2777 (2021).
[2] O. Mustonen et al., Chem. Mater. 32, 7070 (2020).
[3] O. Mustonen et al., Chem. Mater. 36, 501 (2024).

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