First-order superconducting transition of Sr2RuO4 investigated by magnetization and magnetic torque
| Autor: | Toshiro Sakakibara, Kenichi Tenya, Shingo Yonezawa, Akira Kasahara, Daisuke Shibata, Yoshiteru Maeno, Shunichiro Kittaka, Kazushige Machida |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Superconductivity Magnetic moment Condensed matter physics Field (physics) 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Magnetic field Magnetization Hysteresis Magnetic anisotropy Remanence Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 400:81-83 |
| ISSN: | 0304-8853 |
| Popis: | The first-order superconducting transition, recently discovered in a long-standing candidate for a spin-triplet chiral-p-wave superconductor Sr 2 RuO 4 , is mysterious because it is not expected within the present scenario of spin-triplet superconductivity. To uncover its mechanism, we have measured the magnetization and the magnetic torque using an ultra-clean single crystal of Sr 2 RuO 4 down to 0.1 K. In this study, the magnetic-field orientation has been controlled with a high precision within the accuracy of 0.01°. We observed a sharp magnetization jump of as large as 0.01 emu/g with a field hysteresis of 100 Oe at 0.1 K. With increasing temperature, this magnetization jump decreases and diminishes above 0.8 K. The magnetic torque indicates that the first-order transition occurs only when the magnetic field is applied close to the ab plane within 2 degrees deviation. These features of the first-order transition provide the keystone issues whose resolution is crucial in uncovering a “hidden” pair-breaking mechanism within the triplet-pairing scenario, or might urge the reconsideration of the order parameter in Sr 2 RuO 4 . |
| Databáze: | OpenAIRE |
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