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arXiv · 0909.2731

Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7

C. Stingl·R. S. Perry·Y. Maeno·P. Gegenwart
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Abstract

We use high-resolution capacitive dilatometry to study the low-temperature linear magnetostriction of the bilayer ruthenate Sr$_3$Ru$_2$O$_7$ as a function of magnetic field applied perpendicular to the ruthenium-oxide planes ($B\parallel c$). The relative length change $ΔL(B)/L$ is detected either parallel or perpendicular to the c-axis close to the metamagnetic region near B=8 T. In both cases, clear peaks in the coefficient $λ(B)=d(ΔL/L)/dB$ at three subsequent metamagnetic transitions are observed. For $ΔL\perp c$, the third transition at 8.1 T bifurcates at temperatures below 0.5 K. This is ascribed to the effect of an in-plane uniaxial pressure of about 15 bar, unavoidable in the dilatometer, which breaks the original fourfold in-plane symmetry.

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C. Stingl, R. S. Perry, Y. Maeno, P. Gegenwart. 2009-09-15. Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7. https://doi.org/10.1002/pssb.200983034

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