ISIS Neutron and Muon Source Data Journal

The nature of crystal field excitations dominated by field induced quantum fluctuations in Co2+ stacked-honeycomb antiferromagnet: Ba2Co(PO4)2

Abstract: We have synthesized Co2+ stacked-honeycomb antiferromagnet compound Ba2Co(PO4)2 and explored detailed structural and magnetic compound for the first time for which microscopic evidence of Co2+ crystal field excitations (CFE) is unknown to date. Co2+ can shows several spin states including high-spin, intermediate-spin, and low-spin state, therefore the CEF energy levels will give proper information about the accurate spin-state of Co2+. For the proposed Co2+ compound, through a combination of magnetic susceptibility, specific heat, and 31P NMR studies, the temperature-magnetic-field phase diagram associated with this long range magnetic ordering at TN = 3~K has been mapped out. A low-temperature field-induced spin-flop transition below TN is found to occur at an applied field (B) of 3 Tesla. The temperature dependent susceptibility curve also shows pronounced broad peak at around Tmax = 4 K, characteristics of the short-range magnetic ordering. The combined results of heat capacity and susceptibility of Ba2Co(PO4)2 stabilize a magnetic field induce phase transition. Interestingly, the field tuned non-thermal parameter is used to drive the long-range-ordering state towards more quantum disorder state, where a quantum critical point (QCP) is evident at critical field about ~3 T on H-T phase diagram.

Principal Investigator: Dr Arvind Kumar Yogi
Experimenter: Dr Abhisek Bandyopadhyay
Experimenter: Mr KOUSHIK CHAKRABORTY
Experimenter: Dr Devashi Adroja
Experimenter: Ms Aditi Agrawal
Experimenter: Ms Isha Isha
Local Contact: Dr Travis Williams

DOI: 10.5286/ISIS.E.RB2590176

ISIS Experiment Number: RB2590176

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 Arvind Kumar Yogi et al; (2025): The nature of crystal field excitations dominated by field induced quantum fluctuations in Co2+ stacked-honeycomb antiferromagnet: Ba2Co(PO4)2 , STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2590176

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