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Magnetic order and excitations in Ce3TiBi5and Ce3ZrBi5
Pyeongjae Park1, Qianli Ma2, Wei Tian2
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States of America.
Abstract:
TheR3MBi5rare-earth intermetallics (R= rare earth,M= Ti, Zr, Sc) provide a versatile platform to explore how Kondo hybridization, Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange, magnetic frustration, and broken inversion symmetry may cooperate to generate unusual magnetic behavior. We present a comprehensive neutron scattering investigation of the magnetic structure, crystal electric field (CEF), and low-energy excitations in the locally noncentrosymmetric Kondo-lattice compounds Ce3TiBi5and Ce3ZrBi5. Powder and single-crystal neutron diffraction reveals incommensurate cycloidal antiferromagnetic order in Ce3TiBi5with propagation vectork=(0,0,0.388)and a reduced ordered moment ofm=0.53(3)μB. Ce3ZrBi5exhibits a qualitatively similar magnetic diffraction profile, withk≃(0,0,0.37). Inelastic neutron scattering measurements resolve two clear, well-separated CEF excitations in both compounds with nearly the same profile, confirming a well-isolated Kramers doublet ground state. At low energies, a broad, quasi-elastic magnetic response is observed atT≃TN, whose momentum-dependence is inconsistent with that expected from conventional collective excitations of localized moments. This discrepancy, along with a Kondo temperature estimateTK∼6-7 K-comparable toTN-indicates sizable Kondo hybridization, which accounts for the moment reduction and the spiral magnetic order that appears to involve the magnetic hard direction. Our results place these compounds in a regime where local inversion symmetry breaking, anisotropic CEF effects, and competing Kondo and RKKY interactions collectively give rise to unconventional magnetic order.
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