Nonlinear paramagnetic magnetization in the mixed state of CeCoIn5
Abstract
Torque and magnetization measurements in magnetic fields H up to 14 T were performed on CeCoIn5 single crystals. The amplitude of the paramagnetic torque shows an H2.3 dependence in the mixed state and an H2 dependence in the normal state. In addition, the mixed-state magnetizations for both H c and H ab axes show anomalous behavior after the subtraction of the corresponding paramagnetic contributions as linear extrapolations of the normal-state magnetization. These experimental results point towards a nonlinear paramagnetic magnetization in the mixed state of CeCoIn5, which is a result of the fact that both orbital and Pauli limiting effects dominate in the mixed state.
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