Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Frustrated Magnets - General
TT 23.12: Vortrag
Mittwoch, 7. September 2022, 18:00–18:15, H22
“Stripe-yz” magnetic order in KCeS2 — •Anton Kulbakov1,2, Stanislav Avdoshenko3, Inés Puente-Orench4,5, Jacques Ollivier5, Mahmoud Deeb1, Mathias Doerr1, Philipp Schlender6, Thomas Doert6, and Dmytro Inosov1,2 — 1IFMP, TU Dresden, Germany — 2Würzburg-Dresden ct.qmat, TUD, Dresden, Germany — 3IFW, Dresden, Germany — 4INMA, Zaragoza, Spain — 5ILL, Grenoble, France — 6Fakultät für Chemie und Lebensmittelchemie, TU Dresden, Germany
We have solved the magnetic structure for the antiferromagnetic state below TN=400 mK, which was recently revealed in the effective spin-1/2 triangular-lattice antiferromagnet KCeS2. It represents the so-called “stripe-yz” type of antiferromagnetic order with spins lying approximately in the triangular-lattice planes orthogonal to the nearest-neighbor Ce—Ce bonds, possibly with a small out-of-plane canting of the magnetic moments. The thermal expansion remains very small below 120 K, which we confirmed for the c lattice constant using capacitive dilatometry. Our experimental results also indicate that cerium oxysulphide, Ce2O2S, which was present in our sample as a minority phase, does not order magnetically down to 20 mK and may therefore represent a promising spin-liquid candidate deserving a separate study. For details, see [1]. Neutron time-of-flight spectroscopy of low-energy excitations in the ordered state of KCeS2 reveals an unusual spin-wave band with an intensity maximum at Q=0, unlike in KCeO2 and KYbSe2.
[1] J. Phys.: Condens. Matter 33, 425802 (2021)