[1] Univ Aveiro, Dept Mech Engn, P-3810193 Aveiro, Portugal
[2] Univ Coimbra, Dept Phys, Rua Larga, P-3004516 Coimbra, Portugal
[3] Inst Sci, Dept Phys, 15 Madam Cama Rd, Bombay 400032, Maharashtra, India
[4] LNEG, Lisbon, Portugal
[5] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India