The deconfined quantum critical point describing a continuous phase transition from a plaquette-singlet to an antiferromagnetic Néel phase in SrCu2(BO3)2 has remained elusive. Here, the authors conduct high-pressure heat capacity measurements on the material providing experimental evidence indicating a first-order quantum phase transition between the two different symmetry-breaking phases.
- Jing Guo
- Pengyu Wang
- Liling Sun
