Ferroelastic phase transition in K₃Na(CrO₄)₂single crystals: an electron paramagnetic resonance study

Abstract

The phase transition in K3Na(CrO4)2 single crystals has been studied by electron paramagnetic resonance (EPR) of Mn2+ ions. The values of the spin-Hamiltonian parameters have been evaluated. Below the phase transition temperature, the magnetic z-axis is deflected in ac and bc crystallographic planes by the same angle. Anomalous line shapes recorded below the phase transition temperature suggest the existence of an incommensurate phase.

Hyperfine interactions of Er3+ ions in Y2SiO5 : Electron paramagnetic resonance in a tunable microwave cav

“…This limitation has been circumvented by experiments employing strong external magnetic fields, yielding a coherence time of 1.3 seconds for hyperfine transitions in 167 Er 3+ :Y 2 SiO 5 11 , and thus demonstrating the practical viability of quantum memories at 1.5 µm. In order to guide such developments using accurate theoretical models, in addition to enabling the above outlined ZEFOZ technique, it is crucial to have an accurate understanding of the hyperfine structure of Er doped yttrium orthosilicate [12][13][14][15][16] .…”

Low-temperature elastic and dielectric properties of K3Na(SO4)2 crystals

“…EPR studies of the KNCr crystals [11] suggested an incommensurate phase transition between 228 K and 238 K. The KNS, which is isostructural with KNCr, revealed the incommensurate-like behaviour between T 1 and T 2 . Preliminary X-ray scattering studies in KNS [12] revealed both doubled value of c parameter below T 1 and satellite reflexes between T 1 and T 2 .…”

Local Transition of MnO42 −Molecular Impurity Ion in Proper Ferroelastic K3Na(CrO4)2

“…The proper ferroelastic K 3 Na(CrO 4 ) 2 is an object of intense interest and extended studies have been carried out [1][2][3][4]. The main aim of these works, including the X-ray diffraction [1], EPR -and acoustic spectroscopy studies [2,3] was mainly the investigation of the nature and properties of a weak first-order proper ferroelastic phase transition (T c = 239 ).…”

“…The main aim of these works, including the X-ray diffraction [1], EPR -and acoustic spectroscopy studies [2,3] was mainly the investigation of the nature and properties of a weak first-order proper ferroelastic phase transition (T c = 239 ). The ultra-sound study of K 3 Na(CrO 4 ) 2 and the theoretical analysis showed [3] that the primary order-parameter η 1 and the derived one -η 2 are defined by the components of strain tensor ε 4 and (ε 2 -ε 1 )/2, respectively in this case.…”