Ferromagnetic quantum phase transition in Sr1−x Ca x RuO3 thin films
| Autor: | M. A. Schneider, Philipp Gegenwart, V. Moshnyaga |
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| Rok vydání: | 2010 |
| Předmět: |
Quantum phase transition
Materials science Condensed matter physics Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Magnetization Residual resistivity Ferromagnetism law Electrical resistivity and conductivity Curie temperature Scanning tunneling microscope Perovskite (structure) |
| Zdroj: | physica status solidi (b). 247:577-579 |
| ISSN: | 0370-1972 |
| DOI: | 10.1002/pssb.200983004 |
| Popis: | The ferromagnetic quantum phase transition in the perovskite ruthenate Sr$_{1-x}$Ca$_x$RuO$_3$ is studied by low-temperature magnetization and electrical resistivity measurements on thin films. The films were grown epitaxially on SrTiO$_3$ substrates using metalorganic aerosol deposition and characterized by X-ray diffraction and room temperature scanning tunneling microscopy. High residual resistivity ratios of 29 and 16 for $x=0$ and $x=1$, respectively, prove the high quality of the investigated samples. We observe a continuous suppression of the ferromagnetic Curie temperature from $T_C=160$ K at $x=0$ towards $T_C\to 0$ at $x_c\approx 0.8$. The analysis of the electrical resistivity between 2 and 10 K reveals $T^2$ and $T^{3/2}$ behavior at $x\leq 0.6$ and $x\geq 0.7$, respectively. For undoped CaRuO$_3$, the measurement has been extended down to 60 mK, revealing a crossover to $T^2$ behavior around 2 K, which suggests a Fermi-liquid ground state in this system. |
| Databáze: | OpenAIRE |
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