Structural, magnetic, and electronic evolution of the spin-ladder system BaFeS Se with isoelectronic substitution.

We report experimental studies of a series of BaFeS Se (0 ⩽ ⩽ 3) single crystals and powder specimens using x-ray diffraction, neutron-diffraction, muon-spin-relaxation, and electrical transport measurements. A structural transformation from (BaFeS) to (BaFeSe) was identified around = 0.7 - 1.

Strain-Induced Spin-Nematic State and Nematic Susceptibility Arising from 2×2 Fe Clusters in KFe_{0.8}Ag_{1.2}Te_{2}.

Spin nematics break spin-rotational symmetry while maintaining time-reversal symmetry, analogous to liquid crystal nematics that break spatial rotational symmetry while maintaining translational symmetry. Although several candidate spin nematics have been proposed, the identification and characterization of such a state remain challenging because the spin-nematic order parameter does not couple directly to experimental probes. KFe_{0.

Observation of a -type short-range antiferromagnetic order in layer spacing expanded FeS.

We report neutron diffraction studies of FeS single crystals obtained from Rb Fe S single crystals via a hydrothermal method. While no iron vacancy order or block antiferromagnetic order typical of Rb Fe S is found in our samples, we observe -type short-range antiferromagnetic order with moments pointed along the axis hosted by a different phase of FeS with an expanded interlayer spacing. The Néel temperature for this magnetic order is determined to be 170 ± 4 K.

Gradual enhancement of stripe-type antiferromagnetism in the spin-ladder material BaFeS under pressure.

We report pressure-dependent neutron diffraction and muon spin relaxation/rotation measurements combined with first-principles calculations to investigate the structural, magnetic, and electronic properties of BaFeS under pressure. The experimental results reveal a gradual enhancement of the stripe-type ordering temperature with increasing pressure up to 2.6 GPa and no observable change in the size of the ordered moment.

The influence of magnetic order on the magnetoresistance anisotropy of Fe Cu Te.

We performed resistance measurements on [Formula: see text]Cu Te with [Formula: see text] in the presence of in-plane applied magnetic fields, revealing a resistance anisotropy that can be induced at a temperature far below the structural and magnetic zero-field transition temperatures. The observed resistance anisotropy strongly depends on the field orientation with respect to the crystallographic axes, as well as on the field-cooling history. Our results imply a correlation between the observed features and the low-temperature magnetic order.