Stabilization of the tetragonal structure in (Ba1-xSrx)CuSi2O6

Pascal Puphal, Denis Sheptyakov, Natalija Van Well, Lars Postulka, Ivo Heinmaa, Franz Ritter, Wolf Assmus, Bernd Wolf, Michael Lang, Harald Olaf Jeschke, Roser Valentí, Raivo Stern, Christian Rüegg, Cornelius Krellner

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Abstract

We present a structural analysis of the substituted system (Ba1-xSrx)CuSi2O6, which reveals a stable tetragonal crystal structure down to 1.5 K. We explore the structural details with low-temperature neutron and synchrotron powder diffraction, room-temperature, and cryogenic high-resolution 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-Einstein-condensation (BEC) of triplons, within the tetragonal crystal structure of I41/acd. This material offers the opportunity to study the critical properties of triplon condensation in a simple crystal structure.

Original languageEnglish
Article number174121
JournalPhysical Review B
Volume93
Issue number17
DOIs
Publication statusPublished - May 31 2016
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Puphal, P., Sheptyakov, D., Van Well, N., Postulka, L., Heinmaa, I., Ritter, F., Assmus, W., Wolf, B., Lang, M., Jeschke, H. O., Valentí, R., Stern, R., Rüegg, C., & Krellner, C. (2016). Stabilization of the tetragonal structure in (Ba1-xSrx)CuSi2O6. Physical Review B, 93(17), [174121]. https://doi.org/10.1103/PhysRevB.93.174121