Magnetism of Stripe-Ordered La_(5/3)Sr_(1/3)NiO_4
Y. Yoshinari, P. C. Hammel (Los Alamos National Laboratory), S-W., Cheong (Lucent Technologies, Bell Laboratories)
TL;DR
This study uses ^139La NMR to investigate the magnetic properties of La_(5/3)Sr_(1/3)NiO_4, revealing site-specific magnetic behaviors, a suppressed ordering temperature, and complex spin reorientation under magnetic fields.
Contribution
It provides new insights into the magnetic behavior of stripe-ordered nickelates through site-specific NMR analysis and field-induced spin reorientation.
Findings
Different magnetic properties at two La sites due to domain walls
30 K suppression in magnetic ordering temperature indicating glassy behavior
Magnetic field reorients in-plane moments with stiff inter-spin orientations
Abstract
^139La nuclear magnetic resonance studies reveal markedly different magnetic properties of the two sites created by the charged domain wall formation in La_(5/3)Sr_(1/3)NiO_4. NMR is slow compared to neutron scattering; we observe a 30 K suppression in magnetic ordering temperature indicating glassy behavior. Applied magnetic field reorients the in-plane ordered moments with respect to the lattice, but the relative orientation of the spins amongst themselves is stiff and broadly distributed.
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