Domain Wall Dynamics in a Ferroelastic Spin Crossover Complex with Giant Magnetoelectric Coupling

• DOI: 10.1021/jacs.1c08214
• Publication Date: 2021-12-23T15:49:16Z
• Authors: Vibe Boel Jakobsen; Elzbieta Trzop; Emiel Dobbelaar; Laurence C. Gavin; Shalinee Chikara; Xiaxin Ding; Minseong Lee; Kane Esien; Helge Müller-Bunz; Solveig Felton; Eric Collet; Michael A. Carpenter; Vivien S. Zapf; Grace G. Morgan
• Keywords: Triclinic crystal system; Bistability; Spin Crossover

Pinned and mobile ferroelastic domain walls are detected in response to mechanical stress a Mn3+ complex with two-step thermal switching between the spin triplet quintet forms. Single-crystal X-ray diffraction resonant ultrasound spectroscopy on [MnIII(3,5-diCl-sal2(323))]BPh4 reveal three distinct symmetry-breaking phase transitions polar space group series Cc → Pc P1 P1(1/2). The transition mechanisms involve coupling structural state order parameters, Landau tricritical, first order, respectively. two first-order also show changes magnetic properties ordering Jahn-Teller-active complex. On basis of change symmetry from that parent structure, Cc, triclinic phases ferroelastic, which has been confirmed by spectroscopy. Measurements magnetoelectric revealed significant electric polarization at both P1(1/2) transitions, opposite signs. All these polar, while is chiral. Remanent was when applying pulsed field 60 T P1→ region bistability 90 K. Thus, we showcase here rare example multifunctionality crossover material where strain tensors parameters strongly coupled.