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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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| Authors: | H.D. Yang I.P. HongF.H. Hsu H.H. LiS.Y. Tu H.L. HuangS. Chatterjee S. MollahY.-K. Kuo T.I. HsuH.C. Ku W.-H. Li |
| Affiliation: | a Department of Physics, National Sun Yat-Sen University, Kaohsiung 804 Taiwan, ROC b Department of Physics, National Dong-Hwa University, Hualien 974 Taiwan, ROC c Department of Physics, National Tsing-Hua University, Hsin-chu 300 Taiwan, ROC d Department of Physics, National Central University, Chung-Li 320 Taiwan, ROC |
| Abstract: | The specific heat (C) of bi-layered manganites La2−2xSr1+2xMn2O7 (x=0.3 and 0.5) is investigated for the ground state of low temperature excitations. A T3/2 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 T2 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). |
| Keywords: | 75.30.Vn 65.40.&minus b 75.40.&minus s |
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