Crystal growth, structure and magnetic properties of Ca10Cr7O28.
A detailed diffraction study of Ca10Cr7O28is presented which adds significant new insights into the structural and magnetic properties of this compound. A new crystal structure type was used where the a and b axes are doubled compared to previous models providing a more plausible structure where all crystallographic sites are fully occupied. The presence of two different valences of chromium was verified and the locations of the magnetic Cr5+and non-magnetic Cr6+ions were identified. The Cr5+ions have spin-[Formula: see text] and form distorted kagome bilayers which are stacked in an ABC arrangement along the c axis. These results lay the foundation for understanding of the quantum spin liquid behavior in Ca10Cr7O28which has recently been reported in Balz et al (2016 Nat. Phys. 12 942).
Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany. Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany. Present address: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America.
Christian
C
Balz
Bella
B
Lake
Manfred
M
Reehuis
A T M
ATM
Nazmul Islam
Oleksandr
O
Prokhnenko
Yogesh
Y
Singh
Philip
P
Pattison
Sándor
S
Tóth