# Dresden 2020 – wissenschaftliches Programm

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# TT: Fachverband Tiefe Temperaturen

## TT 5: Frustrated Magnets - General 1 (joint session TT/MA)

### TT 5.7: Vortrag

### Montag, 16. März 2020, 11:00–11:15, HSZ 304

Low-temperature thermal conductivity in the frustrated spin chain mineral Linarite — •Matthias Gillig^{1}, Xiaochen Hong^{1}, Gaël Bastien^{1}, Anja U.B. Wolter^{1}, Bernd Büchner^{1, 2}, and Christian Hess^{1, 2} — ^{1}Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany — ^{2}Center for Transport and Devices, TU Dresden, Germany

Motivated by recent theoretical results which predict a finite thermal Drude weight in frustrated spin chains, we have studied the thermal conductivity of the mineral Linarite PbCuSO_{4}(OH)_{2} at low temperature.
This well-studied material forms a monoclinic structure where a sequence of Cu(OH)_{2} units forms a S=1/2 spin chain. Competing FM nearest-neighbor and AFM next-nearest-neighbor interactions in this low dimensional spin structure create a magnetically frustrated system which orders below T_{N} = 2.8 K in an elliptical spiral ground state. Upon applying magnetic field along the spin chain direction, other magnetically ordered phases can be induced. For fields of 10 T and higher the spin system is fully polarized.
Our results reveal that the thermal conductivity κ in zero field is dominated by a phononic contribution. As a function of magnetic field κ shows a peculiar non-monotonic behavior. Whenever the magnetic field value approaches a critical field, κ is highly suppressed. This trend can be explained by strong magnetic fluctuations which are expected near a phase boundary and which reduce thermal conductivity by phonon scattering.