Planar triangular 
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 magnet 
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: Magnetic frustration, short range correlations, and field-tuned anisotropic cycloidal magnetic order

Baenitz, M.; Piva, M. M.; Luther, S.; Sichelschmidt, J.; Ranjith, K. M.; Dawczak-Dębicki, H.; Ajeesh, M. O.; Kim, Seo-Jin; Siemann, Gesa-R.; Bigi, Chiara; Manuel, Pascal; Khalyavin, D.; Sokolov, Dmitry; Mokhtari, Parisa; Zhang, Haijing; Yaśuoka, Hiroshi; King, P. D. C.; Vinai, Giovanni; Polewczyk, Vincent; Torelli, Piero; Wosnitza, J.; Burkhardt, Ulrich; Schmidt, B.; Rösner, H.; Wirth, S.; Kühne, H.; Schmidt, Marcus

doi:10.1103/physrevb.104.134410

Cited by 15 publications

(12 citation statements)

References 84 publications

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“…Electronic and magnetic structure of AgCrSe 2 High quality AgCrSe 2 single crystals were obtained via chemical transport reaction, and the growth process is described in detail in Baenitz et al 11 . The crystal structure of the AgCrSe 2 single crystal is comprised of alternating layers of Ag and edge-sharing tilted distorted CeSe 6 octahedra 11,[16][17][18] that repeat along the crystallographic c axis (Fig. 1a-c).…”

Section: Resultsmentioning

confidence: 99%

“…This crystal structure is very similar to the one that characterizes delafossite metals (R3m) 19 , however, there is no centro-symmetric inversion symmetry in this space group: R3m. The Cr atoms host S = 3/2 spins arranged on a triangular lattice in each layer 11 . Neutron measurements evidence an incommensurate magnetic order below T N = 32 K with ordering vector Q = (0.037, 0.037, 3/2) in units of the reciprocal lattice constants.…”

Section: Resultsmentioning

confidence: 99%

“…The Cr atoms host S = 3/2 spins arranged on a triangular lattice in each layer. The competing exchange interactions between the firstand third-nearest neighbour Cr moments lead to an incommensurate magnetic order at T N ≈ 32 K 11 .…”

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confidence: 99%

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Concurrence of directional Kondo transport and incommensurate magnetic order in the layered material AgCrSe2

Guimarães,

Fartab,

Moravec

et al. 2024

Commun Phys

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In this work, we report on the concurrent emergence of the directional Kondo behavior and incommensurate magnetic ordering in a layered material. We employ temperature- and magnetic field-dependent resistivity measurements, susceptibility measurements, and high resolution wavelength X-ray diffraction spectroscopy to study the electronic properties of AgCrSe2. Impurity Kondo behavior with a characteristic temperature of TK = 32 K is identified through quantitative analysis of the in-plane resistivity, substantiated by magneto-transport measurements. The excellent agreement between our experimental data and the Schlottmann’s scaling theory allows us to determine the impurity spin as S = 3/2. Furthermore, we discuss the origin of the Kondo behavior and its relation to the material’s antiferromagnetic transition. Our study uncovers a rare phenomenon—the equivalence of the Néel temperature and the Kondo temperature—paving the way for further investigations into the intricate interplay between impurity physics and magnetic phenomena in quantum materials, with potential applications in advanced electronic and magnetic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Concurrence of directional Kondo transport and incommensurate magnetic order in the layered material AgCrSe2

Guimarães,

Fartab,

Moravec

et al. 2024

Commun Phys

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“…In this respect, the family of ACrX 2 materials with X = S, Se or Te are at the interface between the delafossite-type structures and TMDs. Their properties are insufficiently explored so far, likely due to the unavailability of high-quality single crystals for some of these compounds [16,23,26]. Nonetheless, these materials have been observed to display a rich range of magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and anisotropic magnetic properties of LiCrTe 2 single crystals with a triangular-lattice antiferromagnetic structure

et al. 2023

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We report on the synthesis of LiCrTe 2 single crystals and on their anisotropic magnetic properties. We have obtained these single crystals by employing a Te/Li-flux synthesis method. We find LiCrTe 2 to crystallize in a TlCdS 2 -type structure with cell parameters of a = 3.9512(5) Å and c = 6.6196(7) Å at T = 175 K. The content of lithium in these crystals was determined to be neary stoichiometric by means of neutron diffraction. We find a pronounced magnetic transition at T N a b = 144 K and T N c = 148 K, respectively. These transition temperatures are substantially higher than earlier reports on polycrystalline samples. We have performed neutron powder diffraction measurements that reveal that the long-range low-temperature magnetic structure of single crystalline LiCrTe 2 is an A-type antiferromagnetic structure. Our DFT calculations are in good agreement with these experimental observations. We find the system to be easy axis with moments oriented along the c-direction experimentally as well as in our calculations. Thereby, the magnetic Hamiltonian can be written as H = H H e i s e n b e r g + ∑ i K c ( S i z ) 2 with K c = − 0.34 K (where | S z | = 3 2 ). We find LiCrTe 2 to be highly anisotropic, with a pronounced metamagnetic transition for H ⊥ a b with a critical field of μ H M M (5 K) ≈ 2.5 T. Using detailed orientation-dependent magnetization measurements, we have determined the magnetic phase diagram of this material. Our findings suggest that LiCrTe 2 is a promising material for exploring the interplay between crystal structure and magnetism, and could have potential applications in spin-based 2D devices.

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“…At low temperature, the Cr spins order in a noncollinear antiferromagnetic order with antiferromagnetic stacking along the c axis [5] and fluctuations * e.vanheumen@uva.nl of this order persisting up to 200 K [11]. Recently, short range correlations and the interplay between spin-orbit coupling and magnetic order have been studied at low temperatures [12,13].…”

Section: Introductionmentioning

confidence: 99%

Optical phonons and magnetoelastic coupling in the ionic conductor AgCrSe2

Groefsema

Feng

Morice

et al. 2022

Phys. Rev. Materials

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AgCrSe 2 is an example of a superionic conductor that has recently attracted attention for its low thermal conductivity. Here we investigate the optical properties of AgCrSe 2 in the ordered phase between 14 K and 374 K using reflectivity experiments and compare them to the optical conductivity obtained from electronic structure calculations. The far infrared optical response is dominated by three phonon modes, while six interband transitions are observed in the visible range. We find good agreement between the experimental interband transitions and the calculated optical transitions. From our analysis we find that the phonon parameters display an interesting temperature dependence around the Néel temperature, pointing to a small magnetoelastic coupling. In addition, the lifetimes of the modes indicate that three-phonon processes dominate and the optical phonons decay into low-energy acoustic modes involved in the superionic transition. Finally, we detect a small free charge carrier response through the analysis of Fabry-Perot interference fringes in our reflectivity data.

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Planar triangular S=3/2 magnet AgCrSe2 : Magnetic frustration, short range correlations, and field-tuned anisotropic cycloidal magnetic order

Cited by 15 publications

References 84 publications

Concurrence of directional Kondo transport and incommensurate magnetic order in the layered material AgCrSe2

Concurrence of directional Kondo transport and incommensurate magnetic order in the layered material AgCrSe2

Synthesis and anisotropic magnetic properties of LiCrTe 2 single crystals with a triangular-lattice antiferromagnetic structure

Optical phonons and magnetoelastic coupling in the ionic conductor AgCrSe2

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