Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 144, Issue 1, Pages 195-211Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c08214
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Funding
- Science Foundation Ireland (SFI) [19/FFP/6909]
- Augustinus Fonden [18-0338]
- Oticon Fonden [17-3813]
- Reinholdt W. Jorck og Hustrus Fond [18-JI-0573]
- P. A. Fiskers Fond
- A. P. Moller og Hustru Chastine Mc-Kinney Mollers Fond til almene Formaal
- Christian og Ottilia Brorsons Rejselegat for yngre videnskabsmaend og-kvinder
- Natural Environment Research Council of Great Britain [NE/B505738/1, NE/F17081/1]
- Engineering and Physical Sciences Research Council [EP/I036079/1]
- U.S. National Science Foundation [DMR-1157490]
- State of Florida
- U.S. Department of Energy
- Laboratory-Directed Research and Development program (LDRD) by the Center for Molecular Magnetic Quantum Materials (M2QM), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE SC0019330]
- EPSRC [EP/I036079/1] Funding Source: UKRI
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The study revealed the presence of pinned and mobile ferroelastic domain walls in a manganese complex under mechanical stress. Three distinct symmetry-breaking phase transitions in the polar space group series were observed, with coupling between structural and spin state order parameters. Measurements showed significant changes in electric polarization and magnetoelectric coupling at specific phase transitions.
Pinned and mobile ferroelastic domain walls are detected in response to mechanical stress in a Mn3+ complex with two-step thermal switching between the spin triplet and spin quintet forms. Single-crystal X-ray diffraction and resonant ultrasound spectroscopy on [Mn-III(3,5-diCl-sal(2)(323))]BPh4 reveal three distinct symmetry-breaking phase transitions in the polar space group series Cc -> Pc -> P1 -> P1((1)(/2)). The transition mechanisms involve coupling between structural and spin state order parameters, and the three transitions are Landau tricritical, first order, and first order, respectively. The two first-order phase transitions also show changes in magnetic properties and spin state ordering in the Jahn-Teller-active Mn3+ complex. On the basis of the change in symmetry from that of the parent structure, Cc, the triclinic phases are also ferroelastic, which has been confirmed by resonant ultrasound spectroscopy. Measurements of magnetoelectric coupling revealed significant changes in electric polarization at both the Pc -> P1 and P1 -> P1((1/2)) transitions, with opposite signs. All these phases are polar, while P1 is also chiral. Remanent electric polarization was detected when applying a pulsed magnetic field of 60 T in the P1 -> P1((1/2)) region of bistability at 90 K. Thus, we showcase here a rare example of multifunctionality in a spin crossover material where the strain and polarization tensors and structural and spin state order parameters are strongly coupled.
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