Giant magnetothermal conductivity and magnetostriction effect in charge ordered Nd${}_{0.8}$Na${}_{0.2}$MnO${}_3$ compound

Abstract

We present results on resistivity ($\rho$), magnetization ($M$), thermal conductivity ($\kappa$), magnetostriction ($\frac{\Delta L}{L(0)}$) and specific heat ($C_p$) of charge-orbital ordered antiferromagnetic Nd${}_{0.8}$Na${}_{0.2}$MnO${}_3$ compound. Magnetic field-induced antiferromagnetic/charge-orbital ordered insulating to ferromagnetic metallic transition leads to giant magnetothermal conductivity and magnetostriction effect. The low-temperature irreversibility behavior in $\rho$, $M$, $\kappa$ and $\frac{\Delta L}{L(0)}$ due to field cycling together with striking similarity among the field and temperature dependence of these parameters manifest the presence of strong and complex spin-charge-lattice coupling in this compound. The giant magnetothermal conductivity is attributed mainly to the suppression of phonon scattering due to the destabilization of spin fluctuations and static/dynamic Jahn-Teller distortion by the application of magnetic field.

4 Pages, 4 Figures

References in corpus (3)

• Anomalous First Order Transition in $Nd{}_{0.5}Sr{}_{0.5}MnO{}_3$: An interplay between kinetic arrest and thermodynamic transitions
• Large magnetothermal conductivity of HoMnO_3 single crystals and its relation to the magnetic-field induced transitions of magnetic structure
• Giant magnetothermopower in charge ordered Nd0.75Na0.25MnO3

Cited by in corpus (1)

• Heat switch effect in an antiferromagnetic insulator Co${}_3$V${}_2$O${}_8$