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• W2065201441 abstract "${mathrm{CuSiO}}_{3},$ isotypic to the spin-Peierls compound ${mathrm{CuGeO}}_{3},$ was discovered recently as a metastable decomposition product of the silicate mineral dioptase, ${mathrm{Cu}}_{6}{mathrm{Si}}_{6}{mathrm{O}}_{18}ensuremath{cdot}6{mathrm{H}}_{2}mathrm{O}.$ We investigated the physical properties of ${mathrm{CuSiO}}_{3}$ using susceptibility, magnetization, and specific heat measurements on powder samples. The magnetic susceptibility $ensuremath{chi}(T)$ is reproduced very well above $T=8mathrm{K}$ by theoretical calculations for an $S=frac{1}{2}$ antiferromagnetic Heisenberg linear chain without frustration $(ensuremath{alpha}=0)$ and a nearest-neighbor exchange coupling constant of ${J/k}_{B}=21mathrm{K},$ much weaker than in ${mathrm{CuGeO}}_{3}.$ Below $8mathrm{K}$ the susceptibility exhibits a substantial drop. This feature is identified as a second-order phase transition at ${T}_{0}=7.9mathrm{K}$ by specific heat measurements. The influence of magnetic fields on ${T}_{0}$ is weak, and ac-magnetization measurements give strong evidence for a spin-flop phase at ${ensuremath{mu}}_{0}{H}_{mathrm{SF}}ensuremath{simeq}3mathrm{T}.$ The origin of the magnetic phase transition at ${T}_{0}=7.9mathrm{K}$ is discussed in the context of long-range antiferromagnetic order (AF) versus spin-Peierls (SP) order. Susceptibility and specific heat results support the AF ordered ground state. Additional temperature dependent ${}^{63,65}mathrm{Cu}$ nuclear quadrupole resonance experiments have been carried out to probe the ${mathrm{Cu}}^{2+}$ electronic state and the spin dynamics in ${mathrm{CuSiO}}_{3}.$" @default.
• W2065201441 created "2016-06-24" @default.
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• W2065201441 date "2000-11-01" @default.
• W2065201441 modified "2023-10-02" @default.
• W2065201441 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuSiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>A quasi-one-dimensional<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>…" @default.
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• W2065201441 doi "https://doi.org/10.1103/physrevb.62.12201" @default.
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