Microwave absorption across Tc: Determination of the angular dependance Hc2(theta)

Shaltiel, David; Bill, Hans; Grayevsky, A.; Junod, Alain; Lovy, Dominique; Sadowski, Wojciech; Walker, Eric

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Title		Microwave absorption across Tc: Determination of the angular dependance Hc2(theta)
Authors		Shaltiel, David Bill, Hans Grayevsky, A. Junod, Alain Lovy, Dominique Sadowski, Wojciech Walker, Eric
Published in		Physical Review. B, Condensed Matter. 1991, vol. 43, no. 1S, p. 13594-13597
Abstract		It is shown that measuring microwave absorption in high-Tc 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 Tc. Using an ESR spectrometer, the derivative of microwave absorption is measured close to Tc. This allows a determination of the relative angular variation of dHc2/dT at T=Tc in single crystals of Y-Ba-Cu-O. The data fit the Ginzburg-Landau theory on the relative angular variation of Hc2. The ratio (dHc2/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 Tc=89 and 86 K, respectively. These values obtained at 1010 Hz are close to the values obtained by conventional dc methods.
Identifiers		DOI: 10.1103/PhysRevB.43.13594
Full text		Article (Published version) - Free access Other version: http://prola.aps.org/pdf/PRB/v43/i16/p13594_1
Structures		Faculté des sciences / Section de chimie et biochimie / Département de chimie physique
Research group		Groupe Bill
Citation (ISO format)		SHALTIEL, David et al. Microwave absorption across Tc: Determination of the angular dependance Hc2(theta). In: Physical Review. B, Condensed Matter, 1991, vol. 43, n° 1S, p. 13594-13597. https://archive-ouverte.unige.ch/unige:3539