Abstract:
The superconducting transition temperature Tc of metallic glasses
ZrxFelOO-x (x=80, 75), Zr75(NixFelOO-x)25 (x=75, 50, 25), and CU2SZr75
were measured under quasi-hydrostatic pressure up to 8 OPa (80kbar).
The volume (pressure) dependence of the electron-phonon coupling
parameters Aep for CU25Zr75 was calculated using the McMillan equatio11.
Using this volume dependence of Aep and the modified McMillan equation
which incorporates spin-fluctuations, the volume dependence of the spin
fluctuation parameter, Asf, was determined in Zr75Ni25, ZrxFelOO-x , a11d
Zr75(NixFelOO-x)25. It was found that with increasing pressure, spinfluctuations
are suppressed at a faster rate in ZrxFe lOO-x and
Zr75(NixFelOO-x)25, as Fe concentration is increased. The rate of
suppression of spin-fluctuations with pressure was also found to be higher in
Fe-Zr glasses than in Ni-Zr glasses of similar composition.
