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MgB₂ superconductor; microwave absorption; EPR

Microwave absorption studies have been carried out on MgB₂ superconductor using a standard X-band EPR spectrometer. The modulated low-field microwave absorption signals recorded for polycrystalline (grain size ∼ 10 µm) samples suggested the absence of weak-link character. The field dependent direct microwave absorption has been found to obey a ✓H dependence with two different slopes, which indicated a transition from strongly pinned lattice to flux flow regime.

MK Bhide¹ RM Kadam¹ MD Sastry¹ Ajay Singh² Shashwati Sen² Manmeet Kaur² DK Aswal² SK Gupta² VC Sahni²

1. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
2. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India

Published

6 May 2002