Theoretical Investigation of Ferroelectric and Dielectric Properties of Ferroelectric Lead Hydrogen Arsenate (LHA) Crystal

Abstract

Ferroelectric crystals show spontaneous electric polarization even in the absence of an electric field. Lead hydrogen arsenate (LHA) is a member of the group of Lead hydrogen phosphate (LHP) type ferroelectric crystals. We have modified earlier two sub-lattice pseudospin model (PLCM) Hamiltonian for LHA crystal. phonon anharmonic terms, four body interaction terms, and extra spin-lattice terms have been added to the model. For the LHA crystal, formulas for Cochran’s frequency, dielectric constant, and loss tangent have been determined using Green’s function approach, and a strong agreement is displayed when comparing our theoretical results to other researchers’ experimental findings.

Keywords:

• Cochran’s frequency
• Green’s function
• pseudo-spin
• Hamiltonian
• LHA
• PLCM

Acknowledgments

Prof. Subhash Chandra Bhatt (Ex-Head), Prof. P.D. Semalty, Dr. Mayank Joshi, Dr. Muzaffar Iqbal Khan, Mr. Kuldeep Kumar, Ms. Riya Upadhyay, and Mr. Shailendra Chamola provided insightful comments and conversations, for which the authors are thankful.

Disclosure statement

No potential conflict of interest was reported by the author(s).