Microscopic Nature of Magnetic Ground State in CeAuSb2

George Yumnam; Yiyao Chen; Yang Zhao; Arumugam Thamizhavel; Sudesh K. Dhar; Deepak K. Singh

doi:10.1002/pssr.201900304

Microscopic Nature of Magnetic Ground State in CeAuSb₂

George Yumnam, Yiyao Chen, Yang Zhao, Arumugam Thamizhavel, Sudesh K. Dhar, Deepak K. Singh

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The synergistic investigation of ground-state magnetic correlation in the single-crystal heavy fermion compound CeAuSb₂ using detailed neutron scattering measurements and density functional calculations is reported. Unlike the previous reports of single antiferromagnetic transition at T_N ≈ 6 K, three successive transitions with distinct critical exponents at T_N = 5.3, 4.46, and 3.76 K, respectively, are detected in CeAuSb. The low-temperature ground-state magnetic correlation is described by the spin density wave order in the basal plane with propagation wave vector τ = (0.135, 0.135, 0.5) rlu. The spin density wave order arises due to the nesting of hole pockets in the Fermi surface, with parallel surfaces being separated by the experimentally found propagation vector τ. The comprehensive investigation of magnetic ground-state properties is expected to provide new insights in understanding the emerging quantum magnetism in this system, including the debated quantum critical state and magnetic field-induced metamagnetic transitions at low temperature.

Original language	English
Article number	1900304
Journal	Physica Status Solidi - Rapid Research Letters
Volume	13
Issue number	10
DOIs	https://doi.org/10.1002/pssr.201900304
State	Published - Oct 1 2019
Externally published	Yes

Funding

The authors thank Sung Chang for help with neutron scattering measurements. D.K.S. thankfully acknowledges the support by the Department of Energy, Office of Science, Office of Basic Energy Sciences under grant no. DE-SC0014461. This work utilized facilities supported by the Department of Commerce.

Funders	Funder number
Office of Basic Energy Sciences	DE-SC0014461
U.S. Department of Energy
U.S. Department of Commerce
Office of Science

Keywords

density functional calculations
heavy electron compounds
magnetic order
magnetic phase transitions
quantum magnetic phenomena

Access to Document

10.1002/pssr.201900304

Cite this

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title = "Microscopic Nature of Magnetic Ground State in CeAuSb2 ",

abstract = "The synergistic investigation of ground-state magnetic correlation in the single-crystal heavy fermion compound CeAuSb2 using detailed neutron scattering measurements and density functional calculations is reported. Unlike the previous reports of single antiferromagnetic transition at TN ≈ 6 K, three successive transitions with distinct critical exponents at TN = 5.3, 4.46, and 3.76 K, respectively, are detected in CeAuSb. The low-temperature ground-state magnetic correlation is described by the spin density wave order in the basal plane with propagation wave vector τ = (0.135, 0.135, 0.5) rlu. The spin density wave order arises due to the nesting of hole pockets in the Fermi surface, with parallel surfaces being separated by the experimentally found propagation vector τ. The comprehensive investigation of magnetic ground-state properties is expected to provide new insights in understanding the emerging quantum magnetism in this system, including the debated quantum critical state and magnetic field-induced metamagnetic transitions at low temperature.",

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AU - Thamizhavel, Arumugam

AU - Dhar, Sudesh K.

AU - Singh, Deepak K.

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N2 - The synergistic investigation of ground-state magnetic correlation in the single-crystal heavy fermion compound CeAuSb2 using detailed neutron scattering measurements and density functional calculations is reported. Unlike the previous reports of single antiferromagnetic transition at TN ≈ 6 K, three successive transitions with distinct critical exponents at TN = 5.3, 4.46, and 3.76 K, respectively, are detected in CeAuSb. The low-temperature ground-state magnetic correlation is described by the spin density wave order in the basal plane with propagation wave vector τ = (0.135, 0.135, 0.5) rlu. The spin density wave order arises due to the nesting of hole pockets in the Fermi surface, with parallel surfaces being separated by the experimentally found propagation vector τ. The comprehensive investigation of magnetic ground-state properties is expected to provide new insights in understanding the emerging quantum magnetism in this system, including the debated quantum critical state and magnetic field-induced metamagnetic transitions at low temperature.

AB - The synergistic investigation of ground-state magnetic correlation in the single-crystal heavy fermion compound CeAuSb2 using detailed neutron scattering measurements and density functional calculations is reported. Unlike the previous reports of single antiferromagnetic transition at TN ≈ 6 K, three successive transitions with distinct critical exponents at TN = 5.3, 4.46, and 3.76 K, respectively, are detected in CeAuSb. The low-temperature ground-state magnetic correlation is described by the spin density wave order in the basal plane with propagation wave vector τ = (0.135, 0.135, 0.5) rlu. The spin density wave order arises due to the nesting of hole pockets in the Fermi surface, with parallel surfaces being separated by the experimentally found propagation vector τ. The comprehensive investigation of magnetic ground-state properties is expected to provide new insights in understanding the emerging quantum magnetism in this system, including the debated quantum critical state and magnetic field-induced metamagnetic transitions at low temperature.

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