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arXiv 0909.2731cond-mat.str-el
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Sr3Ru2O7低温磁致伸缩的各向异性

Anisotropy of the low-temperature magnetostriction of Sr3Ru2O7

C. Stingl, R. S. Perry, Y. Maeno, P. Gegenwart

摘要:

我们使用高分辨率的电容法研究了双层复合氧化物SrPDMATHABMM Ru $_2$ O $_7$的低温线性磁致伸缩随垂直于氧化物平面($B\parallel c$)施加的磁场的变化。在B=8 T附近的变磁区附近,平行或垂直于c轴检测到相对长度变化$ΔL(B)/L$。在这两种情况下,在三个随后的变磁性转变的系数$λ(B)=d(ΔL/L)/dB$中观察到清晰的峰值。对于$ΔL\perp c$,在8.1 T的第三个转变在低于0.5 K的温度分叉。这归因于约15巴的面内单轴压力的影响,这在压力计中是不可避免的,它打破了原始的四重面内对称性。

英文摘要:

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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