The magnetoelastic coupling in Ca1.8Sr0.2RuO4 and in Ca1.5Sr0.5RuO4 has been studied combining high-resolution dilatometer and diffraction techniques. Both compounds exhibit strong anomalies in the thermal-expansion coefficient at zero and at high-magnetic field as well as an exceptionally large magnetostriction. All these structural effects, which are strongest in Ca1.8Sr0.2 RuO4, point to a redistribution of electrons between the different t2g orbitals tuned by temperature and magnetic field. The temperature and the field dependence of the thermal-expansion anomalies in Ca1.8Sr0.2RuO4 yield evidence for a critical end-point lying close to the low-temperature metamagnetic transition; however, the expected scaling relations are not well fulfilled.
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Baier, J., Steffens, P., Schumann, O. et al. Magnetoelastic Coupling Across the Metamagnetic Transition in Ca2-x Sr x RuO4 \({(0.2\leq x\leq 0.5)}\) . J Low Temp Phys 147, 405–420 (2007). https://doi.org/10.1007/s10909-007-9330-0
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DOI: https://doi.org/10.1007/s10909-007-9330-0