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Phonon, magnon and electron contributions to low temperature specific heat in metallic state of La0·85Sr0·15MnO3 and Er0·8 Y 0·2MnO3 manganites

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Abstract.

The reported specific heat C (T) data of the perovskite manganites, La0·85Sr0·15MnO3 and Er0·8 Y 0·2MnO3, is theoretically investigated in the temperature domain 3 ≤ T ≤ 50 K. Calculations of C (T) have been made within the three-component scheme: one is the fermion and the others are boson (phonon and magnon) contributions. Lattice specific heat is well estimated from the Debye temperature for La0·85Sr0·15MnO3and Er0·8 Y 0·2MnO3 manganites. Fermion component as the electronic specific heat coefficient is deduced using the band structure calculations. Later on, following double-exchange mechanism the role of magnon is assessed towards specific heat and found that at much low temperature, specific heat shows almost T3/2 dependence on the temperature. The present investigation allows us to believe that electron correlations are essential to enhance the density of states over simple Fermi-liquid approximation in the metallic phase of both the manganite systems. The present numerical analysis of specific heat shows similar results as those revealed from experiments.

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Acknowledgement

Financial assistance from the Madhya Pradesh Council of Science and Technology, Bhopal, is gratefully acknowledged.

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Authors and Affiliations

  1. Materials Science Laboratory, School of Physics, Devi Ahilya University, Khandwa Road Campus, Indore, 452 001, India

    DINESH VARSHNEY, IRFAN MANSURI & E KHAN

  2. Deparment of Physics, Indore Institute of Science and Technology, Pithampur Road, Rau, Indore, 453 331, India

    IRFAN MANSURI

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  1. DINESH VARSHNEY
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  2. IRFAN MANSURI
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  3. E KHAN
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Correspondence to DINESH VARSHNEY.

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VARSHNEY, D., MANSURI, I. & KHAN, E. Phonon, magnon and electron contributions to low temperature specific heat in metallic state of La0·85Sr0·15MnO3 and Er0·8 Y 0·2MnO3 manganites. Bull Mater Sci 36, 1255–1260 (2013). https://doi.org/10.1007/s12034-013-0602-9

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  • DOI: https://doi.org/10.1007/s12034-013-0602-9

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