Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 6.1: Vortrag

Montag, 16. März 2020, 09:30–09:45, HSZ 401

Driving the magnetic transition by chemical substitution in Cs1−xRbxFeCl3 — •Lena Stoppel1, Shohei Hayashida1, Zewu Yan1, Severian Gvasaliya1, Andrey Podlesnyak2, and Andrey Zheludev11Laboratory for Solid State Physics, ETH Zurich, Switzerland — 2Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennesse

We report the observation of a chemical-substitution driven phase transition from a gapped quantum paramagnetic phase to one with long range order in Cs1−xRbxFeCl3. The x = 0 compound in this series of triangular-lattice antiferromagnets has a spin-singlet ground state due to strong easy-plane magnetic anisotropy. In contrast, the x = 1 material orders magnetically in a 120 structure [1]. Calorimetric and magnetic experiments performed on a series of samples with 0 ≤ x ≤ 1 reveal that in the low-temperature limit magnetic order appears at x ∼ 0.35. Inelastic neutron scattering experiments show that this coincides with the closure of the gap in the spin excitation spectrum. It appears that disorder effects in this material are more pronounced than those in the only other known phase transition of this type, namely in DTNX [2].

[1] S. Hayashida L. Stoppel et al., Phys. Rev. B 99, 224420 (2019). [2] K. Yu. Povarov et al., Phys. Rev. B 92, 024429 (2015).

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