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Stabilization of the tetragonal structure in (Ba$_{1-x}$Sr$_{x}$)CuSi$_{2}$O$_{6}$

Authors :
Puphal, Pascal
Sheptyakov, Denis
van Well, Natalija
Postulka, Lars
Heinmaa, Ivo
Ritter, Franz
Assmus, Wolf
Wolf, Bernd
Lang, Michael
Jeschke, Harald O.
Valenti, Roser
Stern, Raivo
Ruegg, Christian
Krellner, Cornelius
Source :
Phys. Rev. B 93, 174121 (2016)
Publication Year :
2016

Abstract

We present a structural analysis of the substituted system (Ba$_{1-x}$Sr$_{x}$)CuSi$_{2}$O$_{6}$, 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 $I\,4_{1}/acd$. This material offers the opportunity to study the critical properties of triplon condensation in a simple crystal structure.

Details

Database :
arXiv
Journal :
Phys. Rev. B 93, 174121 (2016)
Publication Type :
Report
Accession number :
edsarx.1604.03718
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevB.93.174121