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

✍ Scribed by 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; H.C. Ku; W.-H. Li

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
132 KB
Volume
127
Category
Article
ISSN
0038-1098

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✦ Synopsis

The specific heat ðCÞ of bi-layered manganites La 2 2 2x Sr 1 þ 2x Mn 2 O 7 (x ¼ 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 ¼ 0:3 sample, which is consistent with a ferromagnetic metallic ground state. For x ¼ 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 (6 T).

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