Low temperature specific heat of bi-layered manganites La2−2xSr1+2xMn2O7 (x=0.3 and 0.5)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Low temperature specific heat of bi-layered manganites La_2−2xSr_1+2xMn₂O₇ (x=0.3 and 0.5)

Authors:	HD Yang IP HongFH Hsu HH LiSY Tu HL HuangS Chatterjee S MollahY-K Kuo TI HsuHC Ku W-H Li

Institution:	^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 La_2−2xSr_1+2xMn₂O₇ (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 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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