TY - JOUR
T1 - Effect of hydrostatic pressure upon the magnetic transitions in the Gd5 (Six Ge1-x) 4 giant magnetocaloric compounds
T2 - X-ray magnetic circular dichroism study
AU - Tseng, Yuan-Chieh
AU - Haskel, D.
AU - Lang, J. C.
AU - Sinogeikin, S.
AU - Mudryk, Ya
AU - Pecharsky, V. K.
AU - Gschneidner, K. A.
PY - 2007/7/10
Y1 - 2007/7/10
N2 - The pressure dependence of the magnetic transitions in the giant magnetocaloric materials Gd5 (Six Ge1-x) 4 (x=0.125,0.5) has been investigated using x-ray magnetic circular dichroism (XMCD) measurements in a diamond anvil cell (DAC). We found that the most notable features of the x-T phase diagram are also present in the P-T phase diagram. These include a nearly linear increase in Curie temperature, Tc, with increasing both x and P up to 275 K, and a discontinuity accompanied by a change in slope, d Tc /d (x,P), at this temperature. However, the results indicate that a similar volume change results in ∼3 times larger increase in Tc with Si doping than with pressure. Si doping, hence, does more to stabilize ferromagnetic interactions than simply uniformly reducing the unit cell volume.
AB - The pressure dependence of the magnetic transitions in the giant magnetocaloric materials Gd5 (Six Ge1-x) 4 (x=0.125,0.5) has been investigated using x-ray magnetic circular dichroism (XMCD) measurements in a diamond anvil cell (DAC). We found that the most notable features of the x-T phase diagram are also present in the P-T phase diagram. These include a nearly linear increase in Curie temperature, Tc, with increasing both x and P up to 275 K, and a discontinuity accompanied by a change in slope, d Tc /d (x,P), at this temperature. However, the results indicate that a similar volume change results in ∼3 times larger increase in Tc with Si doping than with pressure. Si doping, hence, does more to stabilize ferromagnetic interactions than simply uniformly reducing the unit cell volume.
UR - http://www.scopus.com/inward/record.url?scp=34447313906&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.76.014411
DO - 10.1103/PhysRevB.76.014411
M3 - Article
AN - SCOPUS:34447313906
VL - 76
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 1
M1 - 014411
ER -