Stabilization of the tetragonal structure in (BaSr)CuSiO
arXiv:1604.03718 · doi:10.1103/PhysRevB.93.174121
Abstract
We present a structural analysis of the substituted system (BaSr)CuSiO, which reveals a stable tetragonal crystal structure down to 1.5 K. We explore the structural details with lowtemperature neutron and synchrotron powder diffraction, room-temperature and cryogenic highresolution NMR, as well as magnetic- and specific-heat measurements and verify that a structural phase transition into the orthorhombic structure which occurs in the parent compound BaCuSi2O6, is absent for the x = 0.1 sample. Furthermore, synchrotron powder-diffraction patterns show a reduction of the unit cell for x = 0.1 and magnetic measurements prove that the Cu-dimers are preserved, yet with a slightly reduced intradimer coupling Jintra. Pulse-field magnetization measurements reveal the emergence of a field-induced ordered state, tantamount to Bose-Einsteincondensation (BEC) of triplons, within the tetragonal crystal structure of . This material offers the opportunity to study the critical properties of triplon condensation in a simple crystal structure.
References in corpus (7)
- Bose-Einstein Condensation in Magnetic Insulators
- Dimensional reduction at a quantum critical point
- Barlowite as a canted antiferromagnet: theory and experiment
- Theory of the field-induced BEC in the frustrated spin-1/2 dimer compound BaCuSi2O6
- NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSiO
- Two types of adjacent dimer layers in the low temperature phase of BaCuSi2O6
- Crystal growth with oxygen partial pressure of the and spin dimer compounds