Metamagnetism in the antiferromagnetic correlated metal Ca_1-xSr_xRuO4 for x=0.2
Abstract
We report electrical transport and magnetization measurements at high magnetic fields in Ca1-xSrxRuO4 (where x = 0.2) for which a particular type of orbital ordering was recently proposed [1]. At low temperatures, we found an anisotropic metamagnetic transition towards a spin-polarized state whose magnetic moment tends to saturate to a value of 1mB/Ru. This transition is preceded by a significant amount of orientation-dependent positive magnetoresistance (up to 100 followed by negative magnetoresistance suggesting an AF to paramagnetic transition. In the AF state, when a small magnetic field is rotated in the conducting planes, the inter-plane resistivity displays a sinusoidal behavior with a two-fold periodicity. As the metamagnetic transition is crossed, a new four-fold periodicity emerges at high fields. We speculate that this change in the symmetry of the electronic properties might be correlated to a field-induced structural transition and/or melting of the orbital-ordered state. [1] V. I. Anisimov et al., Eur. J. Phys. B 25, 191 (2002).
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MARD19005B