Dispersive magnetic excitations in theS=1antiferromagnetBa3Mn2O

Pressure Dependent Diffraction and Spectroscopy of a Dimerized Antiferromagnet

“…18) For this system, it was found that the spin gap closed at a rate of approximately 0.23 meV per GPa. Here we examine the influence of pressure on the exchange interactions in the two-dimensional S = 1 disordered antiferromagnet Ba 3 8 (1 1 6) P = 0 P = 9 GPa P = 5.5 GPa Fig. 1.…”

“…5,7) Inelastic neutron scattering measurements examining powders and single crystals determined the exchange connectivity and interactions. 8,9) Typical approaches to accessing quantum critical points in gapped spin liquid compounds include the application of applied magnetic fields and chemical substitution. Recently, non-magnetic substitution has also been studied in Ba 3 (Mn 1−x V x ) 2 O 8 , and a potential disordered random singlet ground state has been found.…”

“…8,9) Typical approaches to accessing quantum critical points in gapped spin liquid compounds include the application of applied magnetic fields and chemical substitution. Recently, non-magnetic substitution has also been studied in Ba 3 (Mn 1−x V x ) 2 O 8 , and a potential disordered random singlet ground state has been found. 10,11) Still another approach to perturbing the magnetic ground state of quantum antiferromagnets is to apply external pressure to the crystal structure.…”

“…[1][2][3] One such system which we have been studying is Ba 3 Mn 2 O 8 . This compound consists of coupled S = 1 Mn 5+ spin dimers arranged on a hexagonal lattice.…”

“…scribed. 5,8) Samples were examined for phase purity using a laboratory Cu anode x-ray powder diffractometer. No additional phases or unreacted materials were observed.…”