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Low temperature specific heat of bi-layered manganites La2-2xSr1+2xMn2O7 (x = 0.3 and 0.5)
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Low temperature specific heat of bi-layered manganites La2-2xSr1+2xMn2O7 (x = 0.3 and 0.5)

H. D. Yang, I. P. Hong, F. H. Hsu, H. H. Li, S. Y. Tu, H. L. Huang, S. Chatterjee, S. Mollah, Y. K. Kuo, T. I. Hsu, …
Solid State Communications, Vol.127(3), pp.229-232
07/2003
DOI: https://doi.org/10.1016/S0038-1098(03)00391-0

Abstract

A. Magnetically ordered materials D. Exchange and Superexchange D. Heat capacity
The specific heat (C) of bi-layered manganites La 2-2x Sr 1+2x Mn 2 O 7 (x = 0.3 and 0.5) is investigated for the ground state of low temperature excitations. A T 3/2 dependent term in the low temperature specific heat (LTSH) is identified at zero magnetic field and suppressed by magnetic fields for x = 0.3 sample, which is consistent with a ferromagnetic metallic ground state. For x = 0.5 sample, a T 2 term is observed and is consistent with a two-dimensional (2D) antiferromagnetic insulator. However, it is almost independent of magnetic field within the range of measured temperature (0.6-10 K) and magnetic field (6T). © 2003 Elsevier Science Ltd. All rights reserved.

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