Journal
PHYSICAL REVIEW B
Volume 85, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.165143
Keywords
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Funding
- NSF [DMR-0856234, EPS-0814194]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0856234] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [814194] Funding Source: National Science Foundation
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Ca2RuO4 is a structurally driven Mott insulator with a metal-insulator transition at T-MI = 357K, followed by a well-separated antiferromagnetic order at T-N = 110 K. Slightly substituting Ru with a 3d transition metal ion M effectively shifts T-MI by weakening the orthorhombic distortion and induces either metamagnetism or magnetization reversal below T-N. Moreover, M doping for Ru produces negative thermal expansion in Ca2Ru1-xMxO4 (M = Cr, Mn, Fe, or Cu); the lattice volume expands on cooling with a total volume expansion ratio, Delta V/V, reaching as high as 1%. The onset of the negative thermal expansion closely tracks T-MI and T-N, sharply contrasting classic negative thermal expansion that shows no relevance to electronic properties. In addition, the observed negative thermal expansion occurs near room temperature and extends over a wide temperature interval up to 300 K. These findings underscore new physics driven by a complex interplay between orbital, spin, and lattice degrees of freedom.
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