List references from the University of Geneva Physical Chemistry reference database

It is shown that using an ESR spectrometer with magnetic field modulation and sweeping the temperature across T_c (at a constant and a very low magnetic field), is equivalent to temperature modulation. The signal intensity obtained when crossing T_c is proportional to 1/( delta H_c2/ delta T) at T=T_c. Using the WHH relation H_c2(T=0)=0.7 T_c( delta H_c2/ delta T)_T=Tc enabled the measurement of the relative angular variation of H_c2 in single crystals of YBaCuO with T_c approximately 85 K. The data fit the Ginzberg-Landau theory. This very sensitive technique can be used to characterize properties of high T_c superconducting materials. Results on thin films is also be presented.

It is shown that measuring microwave absorption in high-T_c superconductors at constant and very low magnetic fields, using magnetic-field modulation, is, under some conditions, equivalent to temperature modulation when sweeping the temperature across T_c. Using an ESR spectrometer, the derivative of microwave absorption is measured close to T_c. This allows a determination of the relative angular variation of dH_c2/dT at T=T_c in single crystals of Y-Ba-Cu-O. The data fit the Ginzburg-Landau theory on the relative angular variation of H_c2. The ratio (dH_c2/dT)_T=Tc parallel and perpendicular to the Cu planes was found to be 2.7 and 5.3 for two Y-Ba-Cu-O single crystals with T_c=89 and 86 K, respectively. These values obtained at 10¹⁰ Hz are close to the values obtained by conventional dc methods.

Determination of the angular dependence of H_c2 in high T_c single crystals by a microwave technique D. Shaltiel, H. Bill, A. Grayevsky, A. Junod, D. Lovy, S. Sadowski and E. Walker Superconductor Science and Technology, 4 (1S) (1991), p85-87 DOI:10.1088/0953-2048/4/1S/014 \| Abstract \| Article PDF
It is shown that using an ESR spectrometer with magnetic field modulation and sweeping the temperature across T_c (at a constant and a very low magnetic field), is equivalent to temperature modulation. The signal intensity obtained when crossing T_c is proportional to 1/( delta H_c2/ delta T) at T=T_c. Using the WHH relation H_c2(T=0)=0.7 T_c( delta H_c2/ delta T)_T=Tc enabled the measurement of the relative angular variation of H_c2 in single crystals of YBaCuO with T_c approximately 85 K. The data fit the Ginzberg-Landau theory. This very sensitive technique can be used to characterize properties of high T_c superconducting materials. Results on thin films is also be presented.


Microwave absorption across T_c: Determination of the angular dependance H_c2(θ) / H_c2 D. Shaltiel, H. Bill, A. Grayevsky, A. Junod, D. Lovy, W. Sadowski and E. Walker Physical Review B, 43 (16) (1991), p13594-13597 DOI:10.1103/PhysRevB.43.13594 \| Abstract \| Article PDF
It is shown that measuring microwave absorption in high-T_c superconductors at constant and very low magnetic fields, using magnetic-field modulation, is, under some conditions, equivalent to temperature modulation when sweeping the temperature across T_c. Using an ESR spectrometer, the derivative of microwave absorption is measured close to T_c. This allows a determination of the relative angular variation of dH_c2/dT at T=T_c in single crystals of Y-Ba-Cu-O. The data fit the Ginzburg-Landau theory on the relative angular variation of H_c2. The ratio (dH_c2/dT)_T=Tc parallel and perpendicular to the Cu planes was found to be 2.7 and 5.3 for two Y-Ba-Cu-O single crystals with T_c=89 and 86 K, respectively. These values obtained at 10¹⁰ Hz are close to the values obtained by conventional dc methods.

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