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 O. Jeschke; Roser Valentí; Raivo Stern; Christian Rüegg; Cornelius Krellner

doi:10.1103/PhysRevB.93.174121

Stabilization of the tetragonal structure in (Ba_1-xSr_x)CuSi₂O₆

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

Research output: Contribution to journal › Article › peer-review

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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 language	English
Article number	174121
Journal	Physical Review B
Volume	93
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.93.174121
Publication status	Published - May 31 2016
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.93.174121

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@article{bfdb9fa6a60d409b970f9b0ce73be307,

title = "Stabilization of the tetragonal structure in (Ba1-xSrx)CuSi2O6",

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.",

author = "Pascal Puphal and Denis Sheptyakov and {Van Well}, Natalija and Lars Postulka and Ivo Heinmaa and Franz Ritter and Wolf Assmus and Bernd Wolf and Michael Lang and Jeschke, {Harald O.} and Roser Valent{\'i} and Raivo Stern and Christian R{\"u}egg and Cornelius Krellner",

note = "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: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = may,

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doi = "10.1103/PhysRevB.93.174121",

language = "English",

volume = "93",

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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 O.

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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Stabilization of the tetragonal structure in (Ba_1-xSr_x)CuSi₂O₆

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