Structural aspects of metamagnetism in Ca2-xSrxRuO4: evidence for field tuning of orbital occupation.
The crystal structure of Ca(2-x)Sr(x)RuO(4) with 0.2 < or = x < or = 1.0 has been studied by diffraction techniques and by high resolution capacitance dilatometry as a function of temperature and magnetic field. Upon cooling in zero magnetic field, the crystal structure and the octahedra shrink along the c direction and elongate in the a and b planes, whereas the opposite occurs upon cooling at high field (x = 0.2 and 0.5). These findings yield evidence for an orbital rearrangement driven by temperature and magnetic field, which accompanies the metamagnetic transition at low temperature. The temperature and magnetic-field dependencies are found to be governed by the same energy scale.
Kriener
M
M
II. Physikalisches Institut, Universität zu Köln, Germany.
Steffens
P
P
Baier
J
J
Schumann
O
O
Zabel
T
T
Lorenz
T
T
Friedt
O
O
Müller
R
R
Gukasov
A
A
Radaelli
P G
PG
Reutler
P
P
Revcolevschi
A
A
Nakatsuji
S
S
Maeno
Y
Y
Braden
M
M