Abstract
We report large orthorhombic distortions in the ferrimagnetic tetragonal (c>a) spinel CuxMn3-xO4 stabilized by a few percent of Cu doping. The orthorhombic strains of the ferrimagnetic phases increased linearly to the doping and reached up to ε≈8.2×10-3 for x=0.19, which is three times larger than the saturated value under external magnetic fields. For high doping (x≳0.17), the distortions first appeared in the paramagnetic phases and underwent further enhancement simultaneously with the onset of the noncollinear ferrimagnetic ordering. We present the rich magnetostructural phase diagram of CuxMn3-xO4, and argue that the diluted t2 orbital degeneracy of Cu2+ under tetrahedral crystal field breaks the global symmetry and triggers the orthorhombic instability inherent in Mn3O4.
| Original language | English |
|---|---|
| Article number | 064404 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 91 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2015 Feb 3 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
Cite this
Diluted orbital degeneracy and large orthorhombic distortions in ferrimagnetic spinel CuxMn3-x O4. / Lee, Kee Hwan; Chang, Hun; Hwang, In Yong; Chung, Jaiho; Kang, Hyun Wook; Kim, Su Jae; Lee, Seongsu.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 6, 064404, 03.02.2015.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Diluted orbital degeneracy and large orthorhombic distortions in ferrimagnetic spinel CuxMn3-x O4
AU - Lee, Kee Hwan
AU - Chang, Hun
AU - Hwang, In Yong
AU - Chung, Jaiho
AU - Kang, Hyun Wook
AU - Kim, Su Jae
AU - Lee, Seongsu
PY - 2015/2/3
Y1 - 2015/2/3
N2 - We report large orthorhombic distortions in the ferrimagnetic tetragonal (c>a) spinel CuxMn3-xO4 stabilized by a few percent of Cu doping. The orthorhombic strains of the ferrimagnetic phases increased linearly to the doping and reached up to ε≈8.2×10-3 for x=0.19, which is three times larger than the saturated value under external magnetic fields. For high doping (x≳0.17), the distortions first appeared in the paramagnetic phases and underwent further enhancement simultaneously with the onset of the noncollinear ferrimagnetic ordering. We present the rich magnetostructural phase diagram of CuxMn3-xO4, and argue that the diluted t2 orbital degeneracy of Cu2+ under tetrahedral crystal field breaks the global symmetry and triggers the orthorhombic instability inherent in Mn3O4.
AB - We report large orthorhombic distortions in the ferrimagnetic tetragonal (c>a) spinel CuxMn3-xO4 stabilized by a few percent of Cu doping. The orthorhombic strains of the ferrimagnetic phases increased linearly to the doping and reached up to ε≈8.2×10-3 for x=0.19, which is three times larger than the saturated value under external magnetic fields. For high doping (x≳0.17), the distortions first appeared in the paramagnetic phases and underwent further enhancement simultaneously with the onset of the noncollinear ferrimagnetic ordering. We present the rich magnetostructural phase diagram of CuxMn3-xO4, and argue that the diluted t2 orbital degeneracy of Cu2+ under tetrahedral crystal field breaks the global symmetry and triggers the orthorhombic instability inherent in Mn3O4.
UR - http://www.scopus.com/inward/record.url?scp=84961296531&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84961296531&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.91.064404
DO - 10.1103/PhysRevB.91.064404
M3 - Article
AN - SCOPUS:84961296531
VL - 91
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 6
M1 - 064404
ER -