Quantum criticality and development of antiferromagnetic order in the quasikagome Kondo lattice CeRh1−xPdxSn

Quantum criticality and development of antiferromagnetic order in the quasikagome Kondo lattice... CeRhSn with a quasikagome lattice of Ce atoms in the hexagonal c plane has been expected to be in close vicinity to a zero-field quantum criticality derived from magnetic frustration. We have studied how the ground state changes with substitution of Pd for Rh in CeRh1−xPdxSn (x≤0.75) by measuring the specific heat C, magnetic susceptibilities χdc and χac, magnetization M, electrical resistivity ρ, and magnetoresistance. For x=0, the field dependence of χac at T=0.03K shows a peak at B∥a=3.5T, confirming the spin-flop crossover in the field applied along the hard axis. The temperature dependence of χac shows a broad maximum at 0.1 K whereas C/T continues to increase down to 0.08 K. For x≧0.1,ρ(T) is dominated by incoherent Kondo scattering and both C/T and χac(T) exhibit peaks, indicating the development of an antiferromagnetic order. The ordering temperature rises to 2.5 K as x is increased to 0.75. Our results indicate that the ground state in the quasikagome Kondo lattice CeRh1−xPdxSn leaves the quantum critical point at x=0 with increasing x as a consequence of suppression of both the magnetic frustration and Kondo effect. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Quantum criticality and development of antiferromagnetic order in the quasikagome Kondo lattice CeRh1−xPdxSn

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Quantum criticality and development of antiferromagnetic order in the quasikagome Kondo lattice CeRh1−xPdxSn

Abstract

CeRhSn with a quasikagome lattice of Ce atoms in the hexagonal c plane has been expected to be in close vicinity to a zero-field quantum criticality derived from magnetic frustration. We have studied how the ground state changes with substitution of Pd for Rh in CeRh1−xPdxSn (x≤0.75) by measuring the specific heat C, magnetic susceptibilities χdc and χac, magnetization M, electrical resistivity ρ, and magnetoresistance. For x=0, the field dependence of χac at T=0.03K shows a peak at B∥a=3.5T, confirming the spin-flop crossover in the field applied along the hard axis. The temperature dependence of χac shows a broad maximum at 0.1 K whereas C/T continues to increase down to 0.08 K. For x≧0.1,ρ(T) is dominated by incoherent Kondo scattering and both C/T and χac(T) exhibit peaks, indicating the development of an antiferromagnetic order. The ordering temperature rises to 2.5 K as x is increased to 0.75. Our results indicate that the ground state in the quasikagome Kondo lattice CeRh1−xPdxSn leaves the quantum critical point at x=0 with increasing x as a consequence of suppression of both the magnetic frustration and Kondo effect.
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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.045139
Publisher site
See Article on Publisher Site

Abstract

CeRhSn with a quasikagome lattice of Ce atoms in the hexagonal c plane has been expected to be in close vicinity to a zero-field quantum criticality derived from magnetic frustration. We have studied how the ground state changes with substitution of Pd for Rh in CeRh1−xPdxSn (x≤0.75) by measuring the specific heat C, magnetic susceptibilities χdc and χac, magnetization M, electrical resistivity ρ, and magnetoresistance. For x=0, the field dependence of χac at T=0.03K shows a peak at B∥a=3.5T, confirming the spin-flop crossover in the field applied along the hard axis. The temperature dependence of χac shows a broad maximum at 0.1 K whereas C/T continues to increase down to 0.08 K. For x≧0.1,ρ(T) is dominated by incoherent Kondo scattering and both C/T and χac(T) exhibit peaks, indicating the development of an antiferromagnetic order. The ordering temperature rises to 2.5 K as x is increased to 0.75. Our results indicate that the ground state in the quasikagome Kondo lattice CeRh1−xPdxSn leaves the quantum critical point at x=0 with increasing x as a consequence of suppression of both the magnetic frustration and Kondo effect.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 26, 2017

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