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Thermotropic reentrant isotropy and induced smectic antiferroelectricity in the ferroelectric nematic realm: comparing RM734 and DIO.
Soft Matter
January 2025
Department of Physics and Soft Materials Research Center, University of Colorado, Boulder, CO 80309, USA.
The current intense study of ferroelectric nematic liquid crystals was initiated by the observation of the same ferroelectric nematic phase in two independently discovered organic, rod-shaped, mesogenic compounds, RM734 and DIO. We recently reported that the compound RM734 also exhibits a monotropic, low-temperature, apolar phase having reentrant isotropic symmetry (the I phase), the formation of which is facilitated to a remarkable degree by doping with small (below 1%) amounts of the ionic liquid BMIM-PF. Here we report similar phenomenology in DIO, showing that this reentrant isotropic behavior is not only a property of RM734 but is rather a more general, material-independent feature of ferroelectric nematic mesogens.
View Article and Find Full Text PDFBroken Symmetry and Elastic Frustration in Isostructural Mn Spin Crossover Crystals.
Chemistry
January 2025
School of Chemistry, University College Dublin, Belfield, Dublin 4, D04 N2E5, Ireland.
Symmetry breaking spin state transitions in two of three isostructural salts of Mn spin crossover cations, [Mn(3-OMe-5-NO-sal323)], with heavy anions are reported. The ReO (1) salt undergoes two-step spin crossover which is coupled with a re-entrant symmetry breaking structural phase transition between a high temperature phase (S=2, C2/c), an intermediate ordered phase (S=1/S=2, P2/c), and a low temperature phase (S=1, C2/c). The AsF (2) complex undergoes an abrupt transition between a high temperature phase (S=2, C2/c) and a low temperature ordered phase (S=1/S=2, P ).
View Article and Find Full Text PDFIntriguing magnetic and electronic behaviors in La and Ru doped SrIrO.
J Phys Condens Matter
January 2025
Department of Physics (MMV), Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India.
We report a detailed experimental study of the structural, magnetic and electrical properties of La and Ru doped (SrLa)IrRuO(= 0.05, 0.15).
View Article and Find Full Text PDFCavitation dynamics and thermodynamic effect of R134a refrigerant in a Venturi tube.
Ultrason Sonochem
January 2025
School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China; MOE Key Laboratory of Cryogenic Technology and Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
Cavitation plays a crucial role in the reliability of components in refrigeration systems. The properties of refrigerants change significantly with temperature, thereby amplifying the impact of thermodynamic effects. This study, based on the Large Eddy Simulation (LES) method and the Schnerr-Sauer (S-S) cavitation model, investigates the transient cavitating flow characteristics of the R134a refrigerant in a Venturi tube (VT).
View Article and Find Full Text PDFLow-Temperature Glassy Behavior of SrNi(CO)(OH)·3HO with Frustrated Spin Hexamers.
Inorg Chem
December 2024
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
In this paper, we studied the synthesis, crystal structure, magnetism, and memory effect of a spin hexamer compound SrNi(CO)(OH)·3HO. The basic magnetic unit of this compound is a ringed spin hexamer (Ni cluster). These Ni clusters are connected by an oxalate group, constituting a two-dimensional framework along the plane.
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