Pressure and field dependence of the magnetic transition in GdBa2Cu3O7-x |
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| Institution: | 1. Department of Neuroscience, Graduate School of Medicine, Kyoto University, Japan;2. Institute for the Advanced Study of Human Biology (WPI-ASHBi), Japan;3. Human Brain Research Center, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan;1. Department of Physics, University of California, San Diego, La Jolla, CA 92093-0319, USA;2. Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2E1, Canada;1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China |
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| Abstract: | The influence of hydrostatic pressure and of magnetic field strenght is presented for the low temperature antiferromagnetic ordering temperature (TN=2.3 K) of GdBa2Cu3O7-x. Data are presented for both superconducting and normal samples, the superconducting sample having a sharp 95 K transition and the oxygen-depleted normal sample being a semiconductor. For both systems the Néel temperatures, extrapolated to zero measuring field, are identical: TN = (2.33±0.03) K. The effect of pressure is to raise the transition temperature slightly for both samples, dTN/dP=+0.03 K/kbar for the superconducting sample and +0.04 K/kbar for the normal sample. The temperature dependence of the heat capacity made in several fixed external magnetic fields and the isothermal magnetization for T<TN provide a measure of the antiferromagnetic-paramagnetic phase boundary, which shows TN approaching T=0 K at about 2.5 T. |
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