Pressure-induced magnetic transition in manganite (La0.75Ca0.25MnO3).
Low temperature Mn K-edge x-ray magnetic circular dichroism and x-ray diffraction measurements were carried out to investigate the stability of the ferromagnetic ground state in manganite La0.75Ca0.25MnO3 under nearly uniform compression using diamond anvil cells. The magnetic dichroism signal gradually decreases with pressure and disappears at 23 GPa, and meanwhile a uniaxial compression of MnO6 octahedra along the b axis is observed to continuously increase with pressure and become anomalously large at 23.5 GPa. These changes are attributed to a ferromagnetic-antiferromagnetic transition that is associated with orbital ordering at high pressure.
Ding
Yang
Y
HPSynC, Carnegie Institution of Washington, Argonne, Illinois 60439, USA. yangding@aps.anl.gov
Haskel
Daniel
D
Tseng
Yuan-Chieh
YC
Kaneshita
Eiji
E
van Veenendaal
Michel
M
Mitchell
J F
JF
Sinogeikin
Stanislav V
SV
Prakapenka
Vitali
V
Mao
Ho-kwang
HK