TY - JOUR
T1 - Stabilization of the tetragonal structure in (Ba1-xSrx)CuSi2O6
AU - Puphal, Pascal
AU - Sheptyakov, Denis
AU - Van Well, Natalija
AU - Postulka, Lars
AU - Heinmaa, Ivo
AU - Ritter, Franz
AU - Assmus, Wolf
AU - Wolf, Bernd
AU - Lang, Michael
AU - Jeschke, Harald Olaf
AU - Valentí, Roser
AU - Stern, Raivo
AU - Rüegg, Christian
AU - Krellner, Cornelius
N1 - Funding Information:
The authors gratefully acknowledge support by the Deutsche Forschungsgemeinschaft through grant SFB/TR 49 and research fellowship WE-5803/1-1. The work in Tallinn was supported by Estonian Research Council grants PUT210 and IUT23-7. This work is partly based on experiments performed at the Swiss spallation neutron source SINQ, and the Swiss Light Source synchrotron radiation source at Paul Scherrer Institute, Villigen, Switzerland.
Publisher Copyright:
© 2016 American Physical Society.
PY - 2016/5/31
Y1 - 2016/5/31
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.93.174121
DO - 10.1103/PhysRevB.93.174121
M3 - Article
AN - SCOPUS:84971500465
VL - 93
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 17
M1 - 174121
ER -