Ph

Discovery of an ultra-quantum spin liquid

Datum
27.04.2021
Zeit
14:50 - 16:20
Sprecher
Lei Shu
Zugehörigkeit
Fudan University (Shanghai)
Sprache
en
Hauptthema
Physik
Andere Themen
Physik
Host
D. Peets
Beschreibung

Abstract:



Quantum fluctuations are expected to lead to highly entangled spin-liquid states in some two-dimensional spin-½ compounds. We have synthesized and measured thermodynamic properties and muon relaxation rates in two related such compounds, one of which is the least disordered of this kind synthesized hitherto and reveals intrinsic properties of a class of spin liquids. Its measured properties can all be simply characterized by scale invariant time-dependent fluctuations with a single parameter. The specific heat divided by temperature and muon relaxation rates are both temperature independent at low temperatures, followed by a logarithmic decrease with increasing temperature. Even more remarkably, ∼57% of the magnetic entropy is missing down to temperatures of O(10−3) the exchange energy, independent of magnetic field up to gμBH > kBT. This is evidence that quantum fluctuations lead either to a gigantic specific heat peak from topological singlet excitations below such temperatures, or to an extensively degenerate topological singlet ground state. These results reveal an ultra-quantum state of matter.



Host: D. Peets



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https://selfservice.zih.tu-dresden.de/link.php?m=89814&p=5cc57b1e (https://selfservice.zih.tu-dresden.de/link.php?m=89814&p=5cc57b1e) (external)

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