ISIS Neutron and Muon Source Data Journal

Probing the ground state and spin dynamics of Quantum spin system CuAl2O4 by Muon Spin Relaxation/Rotation experiments

Abstract: The normal spinel oxide CuAl2O4 has Cu in a 2+ state with quantum spin, S = ½ and shows all the hallmark properties of a quantum spin glass that include a frequency dependent cusp at ~2 K in the ac magnetic susceptibility, the right shift of this 2 K peak in zero field heat capacity in higher applied magnetic fields and logarithmic relaxation rate of magnetization. In addition, there is no evidence of a long range order in the powder neutron diffraction data down to ~0.4 K. A large frustration parameter is found from the dc magnetization data. Although Cu2+ is a Jahn-Teller ion, CuAl2O4 does not undergo any structural distortion down to 0.4 K. Therefore, CuAl2O4 could be a rare example of a frustrated quantum spin glass with orbital liquid state for ground state. In this work, we will study the slow spin dynamics by carrying out muSR experiments and ascertain the glass-like ground state.

Principal Investigator: Dr NIRMALA Rathinam
Local Contact: Dr Peter Baker
Experimenter: Dr Devashi Adroja
Experimenter: Professor Je-Geun Park
Experimenter: Mr Hwanbeom Cho

DOI: 10.5286/ISIS.E.RB1768046

ISIS Experiment Number: RB1768046

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

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

For Example:
Dr NIRMALA Rathinam et al; (2017): Probing the ground state and spin dynamics of Quantum spin system CuAl2O4 by Muon Spin Relaxation/Rotation experiments , STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1768046

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