24-27 November 2022
Karlsruhe Institute of Technology
Europe/Berlin timezone

High-Frequency ESR Studies on the Frustrated quasi-1D Spin-1/2 Chain PbCuSeO$_4$(OH)$_2$

26 Nov 2022, 16:00
2h
Foyer (KIT Campus South)

Foyer

KIT Campus South

KIT Campus map: https://www.kit.edu/campusplan/ Building: 30.22 Room: Foyer im 1. und 2. OG Address: Institute of Technology, Engesserstraße 7, 76131 Karlsruhe Coordinates: 49.01244, 8.41062
Poster Physics Posters Poster session

Speaker

Ms. Rahel Ohlendorf (Kirchhoff Institute for Physics, Heidelberg, Germany)

Description

We report high-frequency ESR studies on a powder sample of the frustrated quasi-1D spin-1/2 chain material PbCuSeO$_4$(OH)$_2$, isostructural to the well studied natural mineral linarite (PbCuSO$_4$(OH)$_2$). Magnetisation data show the evolution of a magnetically ordered phase below $T_{\rm N}$ = 4.3~K and a spin-flop transition at $B_{\rm SF}$ = 2.8~T.
ESR measurements on a loose powder evidence a gapless linear excitation mode within the ground state, which can be traced across the spin-flop transition, as well as two linear excitation modes within the in-field phase with a zero field gap of $-31\pm9$~GHz and $32.9\pm1.4$~GHz. Measurements on a fixed powder reveal a gapped magnon mode in the ground state with a zero field splitting of $70\pm20$~GHz. This mode may be accounted for by assuming an excitation of a spiral spin order in the ground state.
Tracing the resonance positions with temperature suggests an easy-axis type anisotropy with the paramagnetic g-factors 2.3 and 2.07. Changes in resonance position evidence the onset of short range fluctuations at 70~K and the evolution of orthorombic anisotropy.

Category Solid State (Experiment)

Primary authors

Ms. Rahel Ohlendorf (Kirchhoff Institute for Physics, Heidelberg, Germany) Mr. Daniel Knauer (Kirchhoff Institute for Physics, Heidelberg, Germany) Prof. Rüdiger Klingeler (Kirchhoff Institute for Physics, Heidelberg, Germany)

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