| Autor: |
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 |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 93, 174121 (2016) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.93.174121 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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