Triplon Bose-Einstein condensation and proximate magnetism in dimerized antiferromagnets
Abstract
Dimerized quantum magnets provide a useful arena for novel quantum states and phases transitions with the singlet-triplet type of triplon excitations. Here we study the triplon physics and the Bose-Einstein condensation in two isostructural dimerized antiferromagnets ACu(SeO3)2 (A = Hg, Cd). With the systematic measurements, we demonstrate a dimer singlet ground state in HgCu(SeO3)2 with a triplon gap 7.9 K and a triplon Bose-Einstein condensation with an antiferromagnetic order in CdCu(SeO3)2 below 4.4 K. We further adopt the bond-operator technique and show that the elemental replacement preserves the Hamiltonian and allows the study in a unified theoretical framework with tunable interdimer and intradimer interactions on the opposite sides of the quantum critical point. With the peculiar Cu2O8 dimer configuration and effective ferromagnetic interdimer interaction, ACu(SeO3)2 is distinguished from other S = 1/2 dimerized antiferromagnets. Our results represent a global understanding of the magnetic ground states as well as the magnetic transitions in the dimerized magnets of this unusual crystal structure.
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