ISIS Neutron and Muon Source Data Journal

Possible phase coexistence driven by the nematic correlation in a frustrated zigzag chain compound YbCuS2

Abstract: Conventionally, the Heisenberg zig-zag chain (J1-J2 model) provides a dimer spin-singlet ground state with gapped excitations; however, including spin-orbit interaction stabilizes a more exotic phase, namely the nematic dimer-singlet phase with gapless excitations. Experimental observation of such a nematic dimer-singlet phase is scarce. YbCuS2 (which undergoes incommensurate ordering at 0.95 K) turns out to be a promising candidate to realize such a state, as proposed by Nuclear quadrupolar resonance (NQR). Moreover, strong quantum fluctuations are inferred from heat-capacity measurements. Thus, to elucidate the true nature of the ground state, muSR would be essential, especially for a state where possible phase separation may be expected, and the temperature evolution and longitudinal-field effect will help explore the nature of the individual phases.

Principal Investigator: Professor Mayukh Majumder
Experimenter: Dr Devashi Adroja
Experimenter: Professor Takahiro Onimaru
Local Contact: Dr Mark Telling

DOI: 10.5286/ISIS.E.RB2620395

ISIS Experiment Number: RB2620395

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
Select the data format above to find out more about it.

Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Professor Mayukh Majumder et al; (2026): Possible phase coexistence driven by the nematic correlation in a frustrated zigzag chain compound YbCuS2, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2620395

Data is released under the CC-BY-4.0 license.