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Anisotropic electron spin resonance of YbIr2Si2

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arxiv 1003.5133 v1 pith:4SPYTKIR submitted 2010-03-26 cond-mat.str-el

Anisotropic electron spin resonance of YbIr2Si2

T. Gruner , J. Wykhoff , J. Sichelschmidt , C. Krellner , C. Geibel , F. Steglich This is my paper
classification cond-mat.str-el
keywords fieldanisotropymicrowavecrystaldirectionelectrong-factorintensity
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A series of electron spin resonance (ESR) experiments were performed on a single crystal of the heavy fermion metal YbIr2Si2 to map out the anisotropy of the ESR-intensity I_ESR which is governed by the microwave field component of the g-factor. The temperature dependencies of I_ESR(T) and g(T) were measured for different orientations and compared within the range 2.6K \le T \le 16K. The analysis of the intensity dependence on the crystal orientation with respect to both the direction of the microwave field and the static magnetic field revealed remarkable features: The intensity variation with respect to the direction of the microwave field was found to be one order of magnitude smaller than expected from the g-factor anisotropy. Furthermore, we observed a weak basal plane anisotropy of the ESR parameters which we interpret to be an intrinsic sample property.

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