Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.43: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster C
Field induce transition and quantum criticality in spin-3/2 stacked-honeycomb antiferromagnet: Ba2Co(PO4)2 — •Aditi Agrawal1, Koushik Chakraborty1, Isha Isha1, K. M. Ranjith2, M. Baenitz2, M. Isobe3, A. K. Bera4, and Arvind Kumar Yogi1 — 1UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India — 2Khandwa Road — 3Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany — 4Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
We report the bulk and local probe studies on Ba2Co(PO4)2 with stacked-honeycomb lattices of cobalt ions on the bc-plane. 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 TN= 3 K has been mapped out. A low-temperature field-induced spin-flop transition and spin-reorientation transition below TN is found to occur at an applied field of ∼3 Tesla and ∼10 Tesla respectively. The temperature dependent susceptibility curve χ(T) also shows pronounced broad peak, characteristics of the short-range magnetic ordering, with Tmax = 4 K. The combined results of heat capacity and susceptibility of Ba2Co(PO4)2 stabilize a magnetic field induce phase transition. Interestingly, the quantum critical point (QCP) of the phase transition is determined from the extrapolation of the behaviour of TN as a function of magnetic field on H-T phase diagram. The extrapolated QCP is found at a upper critical field (HC∼ 6.5 T
Keywords: Magnetism; Antiferromagnetism; Honeycomb-lattice; NMR; Frustrated lattice