Low temperature structural phase transition and incommensurate lattice modulation in the spin gap compound BaCuSi2O6

Abstract

Results of high resolution x-ray diffraction experiments are presented for single crystals of the spin gap compound BaCuSi${}_2$O${}_6$ in the temperature range from 16 to 300 K. The data show clear evidence of a transition from the room temperature tetragonal phase into an incommensurately modulated orthorhombic structure below $\sim$100 K. This lattice modulation is characterized by a resolution limited wave vector {\bf q}${}_{IC}$=(0,$\sim$0.13,0) and its 2${}^{nd}$ and 3${}^{rd}$ harmonics. The phase transition is first order and exhibits considerable hysteresis. This observation implies that the spin Hamiltonian representing the system is more complex than originally thought.

4 pages, 4 figures

References in corpus (4)

• Magnetic Field-Induced Condensation of Triplons in Han Purple Pigment BaCuSi${}_2$O${}_6$
• Temperature-dependent spin gap and singlet ground state in BaCuSi2O6
• Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6
• Consequences of spin-orbit coupling for the Bose-Einstein condensation of magnons

Cited by in corpus (22)

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• Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6
• Geometric Frustration and Dimensional Reduction at a Quantum Critical Point
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• Role of anisotropy in the spin-dimer compound BaCuSi2O6
• Emergent Symmetry and Dimensional Reduction at a Quantum Critical Point
• NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi${}_2$O${}_6$
• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
• Quantum phase transitions and dimensional reduction in antiferromagnets with inter-layer frustration
• Reduced dimensionality in layered quantum dimer magnets: Frustration vs. inhomogeneous condensates
• Revealing three-dimensional quantum criticality by Sr-substitution in Han Purple
• Quasi-two-dimensional Bose-Einstein condensation of spin triplets in dimerized quantum magnet Ba${}_2$CuSi${}_2$O${}_6$Cl${}_2$
• Spatially Resolved Magnetization in the Bose-Einstein Condensed State of BaCuSi2O6: Evidence for Imperfect Frustration
• Two types of adjacent dimer layers in the low temperature phase of BaCuSi2O6
• Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi${}_2$O${}_6$
• Stabilization of the tetragonal structure in (Ba${}_{1-x}$Sr${}_x$)CuSi${}_2$O${}_6$
• Finite-Temperature Transition in the Spin-Dimer Antiferromagnet BaCuSi2O6
• Crystal growth with oxygen partial pressure of the $BaCuS{i}_2{O}_6$ and $B{a}_{1-x}S{r}_{x}CuS{i}_2{O}_6$ spin dimer compounds
• Floating Zone Growth of Sr Substituted Han Purple: Ba${}_{0.9}$Sr${}_{0.1}$CuSi${}_2$O${}_6$
• Investigating field-induced magnetic order in Han Purple by neutron scattering up to 25.9 T
• Pressure-Induced Structural and Magnetic Evolution in Layered Antiferromagnet YbMn${}_2$Sb${}_2$