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C. S. Lue, Y.-K. Kuo,* F. H. Hsu, H. H. Li, H. D. Yang, P. S. Fodor, and L. E. Wenger Department of Physics, National Sun-Yat-Sen University, Kaohsiung 804, Taiwan Department of Physics, National Dong Hwa University, Hualien 974, Taiwan Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan Department of Physics, Wayne State University,(More)
We report the investigations of specific heat, thermal conductivity, as well as thermoelectric power on the charge-density-wave ~CDW! compound Lu5Ir4Si10 as a function of temperature. All thermal measurements consistently exhibit anomalous features around the CDW transition temperature To;80 K. Although the observations can be associated with the CDW(More)
  • Y. K. Kuo, K. M. Sivakumar, S. J. Huang, C. S. Lue
  • 2005
The effects of Ge partial substitution for Si on the thermoelectric properties of CoSi1−xGex alloys were investigated by means of thermal and electrical transport measurements. Electrical resistivity , Seebeck coefficient S , and thermal conductivity measurements were performed on a series of CoSi1−xGex alloys with x varying from 0 to 0.15. A substantial(More)
Low-temperature specific heat measurements on the Heusler-type compounds Fe2VGa have been performed. We observed the sample-dependent upturn in C/T at low temperatures which is attributed to the effect of magnetic impurities and/or clusters. After subtracting this extrinsic effect, the resulting γ still indicated heavy fermion behavior with an effective(More)
We report the effects of partial substitution of Nb onto the V sites of Fe2VAl by measuring the electrical resistivity, Seebeck coefficient, and thermal conductivity as a function of temperature. It is found that the Nb substitution effectively produces a negative chemical pressure in the system. As a result, the Nb-substituted materials show enhanced(More)
We have studied the thermoelectric properties of the stoichiometric and off-stoichiometric Heusler compounds Fe22xV11xM (M5Al, Ga! between 10 and 300 K. Seebeck coefficient ~S! measurements indicate that stoichiometric Fe2VAl and Fe2VGa are p-type materials with moderate S values of about 30–40 mV/K at room temperature. Upon substituting the Fe site with V,(More)
A systematic study has been made on the effect of Fe substitution by means of resistivity, thermal conductivity, and Seebeck coefficient of the Mg1−xFexB2 superconductor involving 0%, 0.3%, 0.6%, 1.2%, and 3.0% Fe content. The superconducting transition has been found to be very sharp 0.2 K for a pristine sample and substitution of Fe results in the(More)
We have measured the specific heat of CuGeO, using ac calorimetry. There is a sharp discontinuity at its spin-Peierls phase transition (T, = 14 K); the magnitude of the jump is consistent with mean-field theory, and implies a nearest neighbor exchange interaction of 75 K. The ratio of the specific heat peak and temperature derivative of the magnetic(More)
  • H. D. Yang, I. P. Hong, +9 authors W.-H. Li
  • 2003
The specific heat ðCÞ of bi-layered manganites La2 2 2xSr1 þ 2xMn2O7 (x 1⁄4 0:3 and 0.5) is investigated for the ground state of low temperature excitations. A T dependent term in the low temperature specific heat (LTSH) is identified at zero magnetic field and suppressed by magnetic fields for x 1⁄4 0:3 sample, which is consistent with a ferromagnetic(More)
We report a study of the charge-density-wave (CDW) behavior in LaAgSb(2) by means of electrical resistivity, Seebeck coefficient, thermal conductivity, specific heat, and nuclear magnetic resonance (NMR) measurements. Except for the Seebeck coefficient, apparent indications of CDW ordering at around 207 K were noticed in the physical quantities(More)