Effects of high pressure, magnetic fields, and substitutions - ICMR ...
Effects of high pressure, magnetic fields, and substitutions - ICMR ...
Effects of high pressure, magnetic fields, and substitutions - ICMR ...
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Underst<strong>and</strong>ing the <strong>pressure</strong> effects in RMn 2 O 5<br />
Frustration <strong>and</strong> exchange striction as the origin <strong>of</strong> ferroelectricity<br />
Superexchange interactions determine<br />
exchange parameters between Mn<br />
spins<br />
At least 5 different exchange integrals<br />
can be distinguished ⇒ Mostly AFM<br />
Mn 4+<br />
Mn 3+<br />
Ionic displacements relax the<br />
<strong>magnetic</strong> frustration <strong>and</strong><br />
generate the polarization along<br />
the b axis<br />
Magnetic structure from<br />
neutron scattering<br />
c<br />
b<br />
a<br />
P