4.6 Article

Antiferromagnetic order in the honeycomb Kondo lattice CePt6Al3 induced by Pd substitution

Journal

PHYSICAL REVIEW B
Volume 104, Issue 10, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.104411

Keywords

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Funding

  1. JSPS KAKENHI [JP17K05545, JP18H01182, JP21K03473]
  2. Iketani Science and Technology Foundation [0321131A]
  3. SA NRF [93549]
  4. URC/FRC of UJ

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In the CePt6Al3 compound, the development of magnetic order is observed with partial Pd substitution, and as the amount of Pd substitution increases, the antiferromagnetic ordered state becomes stronger.
The cerium-based compound CePt6Al3, in which Ce atoms form a honeycomb lattice hosting magnetic frustration, has a heavy-fermion ground state. We have observed development of magnetic order in partially Pd-substituted Ce(Pt1-xPdx)(6)Al-3 series up to x = 0.3 by the measurements of magnetic susceptibility, electrical resistivity rho, and specific heat C. In the whole range of x, the unit cell volume remains unchanged within 0.2%, and the effective magnetic moment stays at 2.4 mu(B)/Ce. For x = 0.05, both C/T and rho(T) jump on cooling at T-m = 1.8 K. With increasing x to 0.2, T-m increases to 3.8 K, where C/T shows a pronounced A-type anomaly. Application of magnetic fields suppresses T-m, which is indicative of an antiferromagnetic (AFM) ordered state. Thus, a long-range AFM order is induced by the substitution of isovalent Pd for Pt in CePt6Al3 without carrier doping and chemical pressure. We attribute the emergence of AFM order in Ce(Pt1-xPdx)(6)Al-3 to the randomness in the spin-orbit interaction in the Pt-Pd sublattice, which weakens both the coherent Kondo effect and magnetic frustration in the honeycomb Kondo lattice.

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