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Matsuda, Masaaki
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article
Structural and magnetic phase transitions in CeCu<sub>6-x</sub>T<sub>x</sub> (T = Ag,Pd)
Abstract
The structural and the magnetic properties of CeCu<sub>6-x</sub>Ag<sub>x</sub> (0 ≤ x ≤ 0.85) and CeCu<sub>6-x</sub>Pd<sub>x</sub> (0 ≤ x ≤ 0.4) have been studied using neutron diffraction, resonant ultrasound spectroscopy (RUS), x-ray diffraction measurements, and first principles calculations. The structural and magnetic phase diagrams of CeCu<sub>6-x</sub>Ag<sub>x</sub> and CeCu<sub>6-x</sub>Pd<sub>x</sub> as a function of Ag/Pd composition are reported. The end member, CeCu<sub>6</sub>, undergoes a structural phase transition from an orthorhombic (<i>Pnma</i>) to a monoclinic (P2<sub>1</sub>/c) phase at 240 K. In CeCu<sub>6-x</sub>Ag<sub>x</sub>, the structural phase transition temperature (T<sub>s</sub>) decreases linearly with Ag concentration and extrapolates to zero at x<sub>S</sub> ≈ 0.1. The structural transition in CeCu<sub>6-x</sub>Pd<sub>x</sub> remains unperturbed with Pd substitution within the range of our study. The lattice constant b slightly decreases with Ag/Pd doping, whereas a and c increase with an overall increase in the unit cell volume. Both systems, CeCu<sub>6-x</sub>Ag<sub>x</sub> and CeCu<sub>6-x</sub>Pd<sub>x</sub>, exhibit a magnetic quantum critical point (QCP), at x ≈ 0.2 and x ≈ 0.05, respectively. Near the QCP, long range antiferromagnetic ordering takes place at an incommensurate wave vector (δ<sub>1</sub> 0 δ<sub>2</sub>), where δ<sub>1</sub> ~ 0.62, δ<sub>2</sub> ~ 0.25, x = 0.125 for CeCu<sub>6-x</sub>Pd<sub>x</sub> and δ<sub>1</sub> ~ 0.64, δ<sub>2</sub> ~ 0.3, x = 0.3 for CeCu<sub>6-x</sub>Ag<sub>x</sub>. As a result, the magnetic structure consists of an amplitude modulation of the Ce moments which are aligned along the c axis of the orthorhombic unit cell.