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TT: Fachverband Tiefe Temperaturen
TT 9: Poster Session: Correlated Electrons
TT 9.19: Poster
Tuesday, September 28, 2021, 13:30–16:00, P
Magnetic heat transport and strong magneto-elastic coupling in the frustrated spin-chain mineral linarite — •Matthias Gillig1,2, Xiaochen Hong1,3, Piyush Sakrikar4, Gaël Bastien5, Anja Wolter1, Leonie Heinze6, Satoshi Nishimoto1,2, Bernd Büchner1,2, and Christian Hess1,3 — 1IFW Dresden, Germany — 2TU Dresden, Germany — 3Bergische Universität Wuppertal, Germany — 4IISER Mohali, India — 5Charles University, Prague, Czech Republic — 6TU Braunschweig, Germany
Motivated by recent theoretical results predicting a finite thermal Drude weight in frustrated spin chains, we have studied the thermal conductivity of the mineral Linarite PbCuSO4(OH)2 at low temperature. In this well-studied material the Cu-ions form a s=1/2 spin chain with competing FM nearest-neighbor and AFM next-nearest-neighbor interactions, creating a magnetically frustrated system which orders below TN = 2.8 K in an elliptical spiral ground state. In a magnetic field along the spin chain, other magnetically ordered phases can be induced. 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 magnetic fluctuations which are expected near a phase boundary and which reduce thermal conductivity due to strong phonon scattering. Furthermore, a magnon thermal transport channel was verified in the spiral phase.