Abstract
Using elastic neutron scattering on single crystals of La1-x Ax CoO3 (A= Ca2+, Sr2+, and Ba2+), we found the development of magnetic superstructures below the global magnetic transition to be strongly dependent on the size of the A -site dopant, ( rA ), in an unusual way. Upon reducing the (rA ) (i.e., as with Ca doping), only a commensurate ferromagnetic cluster phase is evident. On expanding the ( rA ), the tendency toward coexistence of competing ferromagnetic and antiferromagnetic orders increases giving rise to an inhomogeneous ground state. The antiferromagnetic ordered state, initially incommensurate, continuously strengthens and becomes commensurate with long-range order and a characteristic cubic wave vector of Qc = (0.25,0.25,0.25) with x. The two competing order parameters become comparable in magnitude indicative of the phase-separated nature of the cobalt perovskite system.
| Original language | English |
|---|---|
| Article number | 052402 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 80 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - Aug 17 2009 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Uncharacteristic phase separation trends with the ionic size in cobaltites. / Yu, J.; Louca, Despina; Phelan, D.; Tomiyasu, K.; Horigane, Kazumasa; Yamada, K.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 5, 052402, 17.08.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Uncharacteristic phase separation trends with the ionic size in cobaltites
AU - Yu, J.
AU - Louca, Despina
AU - Phelan, D.
AU - Tomiyasu, K.
AU - Horigane, Kazumasa
AU - Yamada, K.
PY - 2009/8/17
Y1 - 2009/8/17
N2 - Using elastic neutron scattering on single crystals of La1-x Ax CoO3 (A= Ca2+, Sr2+, and Ba2+), we found the development of magnetic superstructures below the global magnetic transition to be strongly dependent on the size of the A -site dopant, ( rA ), in an unusual way. Upon reducing the (rA ) (i.e., as with Ca doping), only a commensurate ferromagnetic cluster phase is evident. On expanding the ( rA ), the tendency toward coexistence of competing ferromagnetic and antiferromagnetic orders increases giving rise to an inhomogeneous ground state. The antiferromagnetic ordered state, initially incommensurate, continuously strengthens and becomes commensurate with long-range order and a characteristic cubic wave vector of Qc = (0.25,0.25,0.25) with x. The two competing order parameters become comparable in magnitude indicative of the phase-separated nature of the cobalt perovskite system.
AB - Using elastic neutron scattering on single crystals of La1-x Ax CoO3 (A= Ca2+, Sr2+, and Ba2+), we found the development of magnetic superstructures below the global magnetic transition to be strongly dependent on the size of the A -site dopant, ( rA ), in an unusual way. Upon reducing the (rA ) (i.e., as with Ca doping), only a commensurate ferromagnetic cluster phase is evident. On expanding the ( rA ), the tendency toward coexistence of competing ferromagnetic and antiferromagnetic orders increases giving rise to an inhomogeneous ground state. The antiferromagnetic ordered state, initially incommensurate, continuously strengthens and becomes commensurate with long-range order and a characteristic cubic wave vector of Qc = (0.25,0.25,0.25) with x. The two competing order parameters become comparable in magnitude indicative of the phase-separated nature of the cobalt perovskite system.
UR - http://www.scopus.com/inward/record.url?scp=70249091062&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevB.80.052402
DO - 10.1103/PhysRevB.80.052402
M3 - Article
AN - SCOPUS:70249091062
VL - 80
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 5
M1 - 052402
ER -