Competing magnetic ground states and their coupling to the crystal lattice in CuFe2Ge2

May, Andrew F.; Calder, Stuart; Parker, David S.; Sales, Brian C.; McGuire, Michael A.

doi:10.1038/srep35325

Competing magnetic ground states and their coupling to the crystal lattice in CuFe₂Ge₂

Journal Article · Fri Oct 14 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep35325· OSTI ID:1329756

May, Andrew F. ^[1]; Calder, Stuart ^[2]; Parker, David S. ^[1]; Sales, Brian C. ^[1]; McGuire, Michael A. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division

Identifying and characterizing systems with coupled and competing interactions is central to the development of physical models that can accurately describe and predict emergent behavior in condensed matter systems. This work demonstrates that the metallic compound CuFe₂Ge₂ has competing magnetic ground states, which are shown to be strongly coupled to the lattice and easily manipulated using temperature and applied magnetic fields. The temperature-dependent magnetization M measurements reveal a ferromagnetic-like onset at 228 (1) K and a broad maximum in M near 180 K. Powder neutron diffraction confirms antiferromagnetic ordering below T_N ≈ 175 K, and an incommensurate spin density wave is observed below ≈125 K. Coupled with the small refined moments (0.5–1 _μB/Fe), this provides a picture of itinerant magnetism in CuFe₂Ge₂. Furthermore, the neutron diffraction data reveal a coexistence of two magnetic phases that further highlights the near-degeneracy of various magnetic states. Our results demonstrate that the ground state in CuFe₂Ge₂ can be easily manipulated by external forces, making it of particular interest for doping, pressure, and further theoretical studies.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1329756

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Borderline Magnetism: How Adding Mg to Paramagnetic Ce Co 3 Makes a 450-K Ferromagnet with Large Magnetic Anisotropy Pandey, Tribhuwan; Parker, David S. Physical Review Applied, Vol. 10, Issue 3 https://doi.org/10.1103/physrevapplied.10.034038	journal	September 2018
Flat-band spin dynamics and phonon anomalies of the saw-tooth spin-chain system Fe 2 O ( SeO 3 ) 2 Gnezdilov, V. P.; Pashkevich, Yu. G.; Kurnosov, V. S. Physical Review B, Vol. 99, Issue 6 https://doi.org/10.1103/physrevb.99.064413	journal	February 2019

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