Evidence of symmetry lowering in antiferromagnetic metal TmBwith dynamic charge stripes.

Precise angle-resolved magnetoresistance (ARMR) and magnetization measurements have revealed (i) strong charge transport and magnetic anisotropy and (ii) emergence of a huge number of magnetic phases in the ground state of isotopicallyB-enriched single crystals of TmBantiferromagnetic (AF) metal with fcc crystal structure and dynamic charge stripes. We analyze for the first time the angular-phase diagrams of AF state of TmBreconstructed from experimental ARMR and magnetization data arguing that the symmetry lowering leads to the appearance of several radial phase boundaries between different phases in the AF state. It is proposed that the suppression of the indirect Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange along ⟨110⟩ directions between nearest neighboring magnetic moments of Tmions and subsequent redistribution of conduction electrons to quantum fluctuations of the electron density (dynamic stripes) are the main factors responsible for the anisotropy.

Role of spin-glass behavior in the formation of exotic magnetic states in GdB.

Randomness and frustration are believed to be two crucial criteria for the formation of spin glass state. However, the spin freezing occurs in some well-ordered crystals below the related temperature T due to the instability of each spin state, which induces the variation of either magnetic moment value or exchange energy. Here we explore the new mechanism of the in-site originated disorder in antiferromagnets GdLaB and GdB, which is caused by the random mutual shifts of Gd spins from the centrally symmetrical positions in the regular cubic lattice.

Evolution of thermoelectric properties in EuYbBfamily.

Seebeck effect in the crystalline samples of EuYbB(= 0, 0.082, 0.127, 0.

Observation of dynamic charge stripes in TmYbB at the metal-insulator transition.

Accurate low temperature charge transport measurements in combination with high-precision x-ray diffraction experiments have allowed detection of the symmetry lowering in the single domain TmYbB crystals that belong to the family of dodecaborides with metal-insulator transition. Based on the fine structure analysis we discover the formation of dynamic charge stripes within the semiconducting matrix of TmYbB. The charge dynamics in these conducting nano-size channels is characterized by broad-band optical spectroscopy that allowed estimating the frequency (~2.

Magnetic resonance probing of ground state in the mixed valence correlated topological insulator SmB.

Introducing of topological insulator concept for fluctuating valence compound - samarium hexaboride - has recently initiated a new round of studies aimed to clarify the nature of the ground state in this extraordinary system with strong electron correlations. Here we discuss the data of magnetic resonance in the pristine single crystals of SmB measured in 60 GHz cavity experiments at temperatures 1.8-300 K.