Electron spin resonance study of the demagnetization fields of the ferromagnetic and paramagnetic films

© Kazan Federal University (KFU). The results of the electron spin resonance study of the La1−xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film

Short-Lived Electron Excitations in FeTe1 – xSex as Revealed by Microwave Absorption

Abstract: The Fe1 + yTe1 – xSex single crystals with the various Se/Te ratios were studied by the microwave absorption and direct current resistivity measurements. The comparison of the microwave absorption data and the resistivity versus temperature made it possible to separate the contributions of two types of spin fluctuations. One of them is due to the anisotropic magnetic (nematic) fluctuations. It is observed over the wide temperature range from ~30 to 150 or 200 K. In FeSe it has the maximum close to the structural transition temperature. Another MWA anomaly is located in the narrow temperature range above the superconducting transition. It is likely due to the antiferromagnetic fluctuations. Annealing of a sample at the temperature around 300°C in the oxygen atmosphere made it possible to exclude the effect of excess iron on the observed anomalies. © 2019, Pleiades Publishing, Inc

Superconducting fluctuations above critical temperature in the Bi<inf>2</inf>Sr<inf>2</inf>Ca<inf>1</inf><inf>−x</inf>Y<inf>x</inf>Cu<inf>2</inf>O<inf>8</inf> single crystals

© Kazan Federal University (KFU).The superconducting fluctuations above critical temperature in the Bi2Sr2Ca1−xYxCu2O8 single crystals are studied. The boundaries of the superconducting fluctuations area are defined by the MWA measurement. The estimation of the fluctuations lifetimes is made

Electron spin resonance study of the demagnetization fields of the ferromagnetic and paramagnetic films

© Kazan Federal University (KFU). The results of the electron spin resonance study of the La1−xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film

Electron spin resonance study of the demagnetization fields of the ferromagnetic and paramagnetic films

© Kazan Federal University (KFU). The results of the electron spin resonance study of the La1−xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film

Electron spin resonance study of the demagnetization fields of the ferromagnetic and paramagnetic films

© Kazan Federal University (KFU). The results of the electron spin resonance study of the La1−xCaxMnO3 manganite and the diphenyl-picrylhydrazyl thin films for the magnetic field parallel and perpendicular to plane of the films are presented. The temperature dependence of the demagnetizing field is obtained. The parameters of the Curie-Weiss law are estimated for the paramagnetic thin film

Short-Lived Electron Excitations in FeTe<inf>1 –</inf><inf>x</inf>Se<inf>x</inf> as Revealed by Microwave Absorption

© 2019, Pleiades Publishing, Inc. Abstract: The Fe1 +yTe1 –xSex single crystals with the various Se/Te ratios were studied by the microwave absorption and direct current resistivity measurements. The comparison of the microwave absorption data and the resistivity versus temperature made it possible to separate the contributions of two types of spin fluctuations. One of them is due to the anisotropic magnetic (nematic) fluctuations. It is observed over the wide temperature range from ~30 to 150 or 200 K. In FeSe it has the maximum close to the structural transition temperature. Another MWA anomaly is located in the narrow temperature range above the superconducting transition. It is likely due to the antiferromagnetic fluctuations. Annealing of a sample at the temperature around 300°C in the oxygen atmosphere made it possible to exclude the effect of excess iron on the observed anomalies

Short-Lived Electron Excitations in FeTe<inf>1 –</inf><inf>x</inf>Se<inf>x</inf> as Revealed by Microwave Absorption

© 2019, Pleiades Publishing, Inc. Abstract: The Fe1 +yTe1 –xSex single crystals with the various Se/Te ratios were studied by the microwave absorption and direct current resistivity measurements. The comparison of the microwave absorption data and the resistivity versus temperature made it possible to separate the contributions of two types of spin fluctuations. One of them is due to the anisotropic magnetic (nematic) fluctuations. It is observed over the wide temperature range from ~30 to 150 or 200 K. In FeSe it has the maximum close to the structural transition temperature. Another MWA anomaly is located in the narrow temperature range above the superconducting transition. It is likely due to the antiferromagnetic fluctuations. Annealing of a sample at the temperature around 300°C in the oxygen atmosphere made it possible to exclude the effect of excess iron on the observed anomalies

Superconducting fluctuations above critical temperature in the Bi<inf>2</inf>Sr<inf>2</inf>Ca<inf>1</inf><inf>−x</inf>Y<inf>x</inf>Cu<inf>2</inf>O<inf>8</inf> single crystals

© Kazan Federal University (KFU).The superconducting fluctuations above critical temperature in the Bi2Sr2Ca1−xYxCu2O8 single crystals are studied. The boundaries of the superconducting fluctuations area are defined by the MWA measurement. The estimation of the fluctuations lifetimes is made