Uniaxial negative thermal expansion in a tetragonal V3S-type superconductor IrZr3

Abstract

Recently, uniaxial negative thermal expansion (NTE) has been observed in transition-metal zirconides including tetragonal (CuAl2-type) CoZr2 and orthorhombic (Re3B-type) CoZr3. Here, we report the observation of uniaxial NTE in tetragonal (V3S-type) IrZr3. With increasing temperature, the lattice parameter for the a-axis and volume of IrZr3 increase, but the lattice parameter for the c-axis decreases. IrZr3 is a superconductor with a transition temperature of 2.3 K. The present result suggests that uniaxial NTE and related anomalous axis thermal expansion occur in various transition-metal zirconides, which will be important for designing superconducting device robust to temperature cycles using zero-thermal-expansion superconductors.

arXiv comment10 pages, 5 figures, Supplemental materials

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Cited by in corpus (1)

• Pressure-induced volumetric negative thermal expansion in CoZr2 superconductor