Giant magnetothermal conductivity and magnetostriction effect in the charge ordered Nd0.8Na0.2MnO3 compound
1 Saha Institute of Nuclear Physics - 1/AF Bidhannagar, Calcutta 700 064, India
2 Indian Institute of Technology Guwahati, Department of Physics - Guwahati 781039, India
Received: 19 November 2015
Accepted: 6 January 2016
We present results on resistivity (ρ), magnetization (M), thermal conductivity (κ), magnetostriction and specific heat (Cp) of the charge-orbital ordered antiferromagnetic Nd0.8Na0.2MnO3 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 ρ, M, κ and due to field cycling together with a striking similarity among the field and temperature dependence of these parameters manifest the presence of a 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.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 75.80.+q – Magnetomechanical effects, magnetostriction / 75.30.Kz – Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
© EPLA, 2016