ISIS Neutron and Muon Source Data Journal

Excitation spectrum of the quantum critical S=1/2 ladder material Ba2CuTeO6

Abstract: Ba2CuTeO6 is a recently discovered S=1/2 spin ladder system containing Cu2+ ladders. Our experiments indicate that it is extremely close to the theoretically predicted quantum critical point (QCP) for the coupled spin ladder system. Magnetic susceptibility data shows that Ba2CuTeO6 displays ideal ladder behaviour down approximately 25 K. Below 25 K the behaviour deviates from that of a ladder and a cusp is seen at 16 K. NMR, specific heat and neutron diffraction do not detect any long-range ordering in the system suggesting the cusp is a sign of marginal ordering. Along with signs of unquenched excess entropy at low temperature from specific heat this indicates proximity to the QCP . In this proposal we plan to investigate the spin excitations in Ba2CuTeO6 over their full band width, establish signatures of quantum criticality in the dispersion and search for the presence of a spin gap

Principal Investigator: Dr Alexandra Gibbs
Experimenter: Mr David Macdougal
Local Contact: Dr Helen Walker
Experimenter: Professor Radu Coldea
Experimenter: Professor Hidenori Takagi

DOI: 10.5286/ISIS.E.RB1610371

ISIS Experiment Number: RB1610371

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:
Dr Alexandra Gibbs et al; (2016): Excitation spectrum of the quantum critical S=1/2 ladder material Ba2CuTeO6, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1610371

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