Thermodynamic Properties of (Ca,Sr)${}_2$RuO${}_4$ in Magnetic Fields

Abstract

We have studied the influence of a magnetic field on the thermodynamic properties of Ca${}_{2-x}$Sr${}_x$RuO${}_4$ in the intermediate metallic region with tilt and rotational distortions ($0.2\le x\le 0.5$). We find strong and anisotropic thermal expansion anomalies at low temperatures, which are suppressed and even reversed by a magnetic field. The metamagnetic transition of Ca${}_{1.8}$Sr${}_{0.2}$RuO${}_4$ is accompanied by a large magnetostriction. Furthermore, we observe a strong magnetic-field dependence of $c_p/T$, that can be explained by magnetic fluctuations.

arXiv comment2 pages, 3 figures, to appear in Physica B (Proceedings of SCES'05)

References in corpus (2)

• Structural and magnetic aspects of the metal insulator transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Structural aspects of metamagnetism in Ca_{2-x}Sr_{x}RuO_4 (0.2 < x < 0.5): field tuning of orbital occupation

Cited by in corpus (4)

• Magnetotransport of dirty-limit van Hove singularity quasiparticles
• Magnetoelastic coupling across the metamagnetic transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$ (0.2 < x < 0.5)
• Field-induced paramagnons at the metamagnetic transition in Ca1.8Sr0.2RuO4
• Phonon softening and anomalous mode near the $x_c=0.5$ quantum critical point in Ca${}_{2-x}$Sr${}_x$RuO${}_4$