Electronic structure and nesting-driven enhancement of the RKKY interaction at the magnetic ordering propagation vector in Gd2PdSi3 and Tb2PdSi3

Abstract

We present first-time measurements of the Fermi surface and low-energy electronic structure of intermetallic compounds Gd2PdSi3 and Tb2PdSi3 by means of angle-resolved photoelectron spectroscopy (ARPES). Both materials possess a flower-like Fermi surface consisting of an electron barrel at the G point surrounded by spindle-shaped electron pockets originating from the same band. The band bottom of both features lies at 0.5 eV below the Fermi level. From the experimentally measured band structure, we estimate the momentum-dependent RKKY coupling strength and demonstrate that it is peaked at the 1/2 GK wave vector. Comparison with neutron diffraction data from the same crystals shows perfect agreement of this vector with the propagation vector of the low-temperature in-plane magnetic order, thereby demonstrating the decisive role of the Fermi surface geometry in explaining the complex magnetically ordered ground state of ternary rare earth silicides.

4 pages, 4 figures

References in corpus (10)

• Magnetic anisotropy, first-order-like metamagnetic transitions and large negative magnetoresistance in the single crystal of Gd${}_2$PdSi${}_3$
• Indirect RKKY interaction in any dimensionality
• Fermi surface nesting in several transition metal dichalcogenides
• Observation of a temperature dependent electrical resistance minimum above the magnetic ordering temperature in Gd${}_2$PdSi${}_3$
• Large Low Temperature Magnetoresistance and Magnetic Anomalies in Tb${}_2$PdSi${}_3$ and Dy${}_2$PdSi${}_3$
• Magnetic, thermal, and transport properties on single crystals of antiferromagnetic Kondo-lattice Ce2PdSi3
• Excitation energy map of the high-energy dispersion anomalies in cuprates
• Relation between the one-particle spectral function and dynamic spin susceptibility in superconducting Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8-\delta }$
• Magnetic behavior of single crystalline Ho${}_2$PdSi${}_3$
• Novel magnetic behavior of single crystalline Er2PdSi3

Cited by in corpus (27)

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• Magnetic Interactions of the Centrosymmetric Skyrmion Material Gd2PdSi3
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