M. Pissas

activity

20012005

collaborators

5 papers

cond-mat.supr-con2005

Mössbauer study of Na $_{0.82}$ CoO $_{2}$ (doped by 1% $^{57}$ Fe)

M. Pissas, V. Psycharis, D. Stamopoulos +3

We studied by Mössbauer spectroscopy the Na $_{0.82}$ CoO $_{2}$ compound using 1% $^{57}$ Fe as a local probe which substitutes for the Co ions. Mössbauer spectra at T=300 K revealed tw…

cond-mat.str-el2004

Nuclear Magnetic Resonance as a probe of nanometre-size orbital textures in magnetic transition metal oxides

G. Papavassiliou, M. Pissas, M. Belesi +7

The study of strong electron correlations in transition metal oxides with modern microscopy and diffraction techniques unveiled a fascinating world of nanosize textures in the spin…

cond-mat.str-el2004

Domain orbital state in ferromagnetic insulating La $_{0.825}$ Ca $_{0.175}$ Mn $_{0.99}$ $^{57}$ Fe $_{0.01}$ O $_{3}$ compound

M. Pissas, G. Papavassiliou, E. Devlin +2

Using Mössbauer and EPR spectroscopy we have studied the insulating ferromagnetic La $_{1 - x}$ Ca $_{x}$ Mn $_{0.99}$ $^{57}$ Fe $_{0.01}$ O $_{3}$ ( $x = 0.175$ ) compound prepared in air and reduce…

cond-mat.supr-con2003

Influence of carbon doping in the vortex matter properties of MgB $_{2}$

M. Pissas, D. Stamopoulos, S. Lee +1

We have studied the vortex-matter phase diagram of low C doped MgB $_{2}$ superconductor. The significant finding is the appearance of a peak effect, which, as both our global magneti…

cond-mat.supr-con2001

Surface barrier and bulk pinning in MgB $_{2}$ superconductor

M. Pissas, E. Moraitakis, D. Stamopoulos +3

We present a modified method of preparation of the new superconductor MgB $_{2}$ . The polycrystalline samples were characterized using x-ray and magnetic measurements. The surface bar…

Mössbauer study of Na0.82​CoO2​ (doped by 1% 57Fe)

Nuclear Magnetic Resonance as a probe of nanometre-size orbital textures in magnetic transition metal oxides

Domain orbital state in ferromagnetic insulating La0.825​Ca0.175​Mn0.99​57Fe0.01​O3​ compound

Influence of carbon doping in the vortex matter properties of MgB2​

Surface barrier and bulk pinning in MgB2​ superconductor

Mössbauer study of Na $_{0.82}$ CoO $_{2}$ (doped by 1% $^{57}$ Fe)

Domain orbital state in ferromagnetic insulating La $_{0.825}$ Ca $_{0.175}$ Mn $_{0.99}$ $^{57}$ Fe $_{0.01}$ O $_{3}$ compound

Influence of carbon doping in the vortex matter properties of MgB $_{2}$

Surface barrier and bulk pinning in MgB $_{2}$ superconductor