High-resolution thermal expansion measurements under Helium-gas pressure

Abstract

We report on the realization of a capacitive dilatometer, designed for high-resolution measurements of length changes of a material for temperatures 1.4 K $\le T\le$ 300 K and hydrostatic pressure $P\le$ 250 MPa. Helium (${}^4$He) is used as a pressure-transmitting medium, ensuring hydrostatic-pressure conditions. Special emphasis has been given to guarantee, to a good approximation, constant-pressure conditions during temperature sweeps. The performance of the dilatometer is demonstrated by measurements of the coefficient of thermal expansion at pressures $P\simeq$ 0.1 MPa (ambient pressure) and 104 MPa on a single crystal of azurite, Cu${}_3$(CO${}_3$)${}_2$(OH)${}_2$, a quasi-one-dimensional spin S = 1/2 Heisenberg antiferromagnet. The results indicate a strong effect of pressure on the magnetic interactions in this system.

arXiv comment8 pages, 7 figures, published in Rev. Sci. Instrum with minor changes

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• Charge-Ordering Transition in (TMTTF)${}_2$X Explored via Dilatometry
• Grüneisen Parameter for Gases
• Magneto-elastic couplings in the distorted diamond-chain compound azurite
• Effects of Disorder on the Pressure-Induced Mott Transition in $\kappa$-BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl
• Probing the Mott Physics in $\kappa$-(BEDT-TTF)${}_2$X Salts via Thermal Expansion
• A uniaxial stress capacitive dilatometer for high-resolution thermal expansion and magnetostriction under multiextreme conditions
• Ingredients for Generalized Models of $\kappa$-Phase Organic Charge-Transfer Salts: A Review
• Pressure study on the interplay between magnetic order and valence-change crossover in EuPd${}_2$(Si${}_{1-x}$Ge${}_x$)${}_2$
• A temperature-modulated dilatometer by using a piezobender-based device
• Magneto-structural properties of the layered quasi-2D triangular-lattice antiferromagnets Cs${}_2$CuCl${}_{4-x}$Br${}_x$ for $x$ = 0,1,2 and 4
• Advanced technique for measuring relative length changes under control of temperature and helium-gas pressure
• Electronic Phase Propagation Speed in BaFe${}_2$As${}_2$ Revealed by Dilatometry
• Tuning Magnetic and Electronic Properties of Double Perovskite La${}_2$CoIr${}_{1-x}$Ti${}_x$O${}_6$