Nonresonant Microwave Absorption in Bi2212 Single Crystal: Second Peak and Microwave Power Dependence

Author: Srinivasu V.V.  

Publisher: Springer Publishing Company

ISSN: 0896-1107

Source: Journal of Superconductivity: Incorporating Novel Magnetism, Vol.14, Iss.1, 2001-02, pp. : 41-46

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Abstract

Nonresonant microwave absorption (NMA) measurements were carried out at liquid-nitrogen temperature on a high quality Bi2212 single crystal, as a function of microwave power in three mutual orientations of crystal ab plane, dc field (H_dc), and microwave magnetic field (H_w). NMA line shapes in Bi2212 crystal are complicated with a narrow peak (P_1 peak) located near zero field, followed by a much broader second peak (P_2 peak) in the particular orientations. More excitingly, we show that the P_2 peak qualitatively evolves as a function of microwave power in the orientation of H_dc ⊥ ab plane, H_w ∥ ab plane, and H_dc ⊥ H_w. In this configuration, as the microwave power is progressively increased, the broad P_2 peak first gets smeared off and then a multiple peak structure appears, which develops into another narrower second peak (P_s-peak) at high enough microwave powers. In the orientation of H_dc ∥ ab plane, H_w ⊥ ab plane, and H_dc ⊥ H_w, we report for the first time the appearance and disappearance of a new second peak (P_2-like peak) as a function of microwave power.