An antiferroquadrupolar ordering at ${T}_{\mathrm{Q}}=0.11\text{ }\text{ }\mathrm{K}$ has been found in a Pr-based superconductor ${\mathrm{PrIr}}_{2}{\mathrm{Zn}}_{20}$. The measurements of specific heat and magnetization revealed the non-Kramers ${\ensuremath{\Gamma}}_{3}$ doublet ground state with quadrupolar degrees freedom. exhibits sharp peak }\mathrm{K}$. increment ${T}_{\mathrm{Q}}$ magnetic fields anisotropic $B\ensuremath{-}T$ phase diagram are consistent ordered below...

Electrical resistivity ρ, specific heat C , magnetization M measurements are reported on four compounds, LaRu 2 Zn 20 PrRu LaIr and PrIr which crystallize in a cubic CeCr Al -type structure. show superconducting transitions at T = 0.2, 0.6, ∼0.05 K, respectively, whereas remains normal state down to 0.04 K. This is the first observation of superconductivity family RT X (T transition metal; Zn). Furthermore, structural phase manifest themselves s 150, 138, 200 K for respectively. No magnetic...

This paper reviews experimental evidence and the related theoretical background on exotic phenomena arising from local quadrupolar degrees of freedom. Recent extensive studies praseodymium-based cubic systems, PrT2X20, have revealed that active quadrupoles in non-Kramers doublet ground state play a vital role exhibiting quadrupole orders superconductivity with underlying peculiar normal paramagnetic electronic states. We focus four prototype compounds PrT2X20 (T = Ir, Rh, X Zn; T V, Ti, Al)....

Superconducting and antiferroquadrupolar (AFQ) transitions in a Pr-based compound PrRh2Zn20 have been found to occur simultaneously at Tc=TQ=0.06 K. The superconducting transition manifests itself by zero resistance large diamagnetic susceptibility. specific heat exhibits Schottky anomaly peaking 14 K magnetization curves measured 2 show anisotropic behaviors. analysis of these data indicates that the crystalline electric field (CEF) ground state trivalent Pr ion is non-Kramers Gamma3...

Magnetic properties were investigated on a single-crystalline DyB 2 C compound with the tetragonal structure. Spontaneous magnetizations appear along a- and [1 1 0]-directions below T =15.3 K. A very small shoulder is observed only c -axis at Q =24.7 K, although large λ-type anomalous specific heats are . There exists magnetic anisotropy in basal plane which magnetization processes Neutron powder diffraction experiments reveal that reflections In magnetically ordered phase, Dy moments...

Neutron diffraction measurements have been performed on the cubic compound ${\mathrm{PrPb}}_{3}$ in a [001] magnetic field to examine quadrupolar ordering. Antiferromagnetic components with $q=(\frac{1}{2}\ifmmode\pm\else\textpm\fi{}\ensuremath{\delta}\text{ }\text{ }\frac{1}{2}\text{ }0)$, ($\frac{1}{2}\text{ }\frac{1}{2}\ifmmode\pm\else\textpm\fi{}\ensuremath{\delta}\text{ }0$) ($\ensuremath{\delta}\ensuremath{\approx}\frac{1}{8}$) are observed below transition temperature...

The thermoelectric properties of Mg–Sb single crystals, which are compared with their polycrystalline counterparts, enhanced by introducing Mn.

The cage compound PrIr 2 Zn 20 with the non-Kramers doublet ground state shows a phase transition at T Q ∼0.11 K. To investigate origin of transition, we have carried out ultrasonic measurements on single-crystalline samples. From disappearance electric quadrupole degrees freedom and negative sign quadrupole–quadrupole coupling constant, clarified that is antiferro-quadrupolar ordering lowest temperature ever measured. We also found anisotropic magnetic field H dependence re-entrant behavior...

Orbital degrees of freedom in condensed matter could play important roles forming a variety exotic electronic states by interacting with conduction electrons. In $4f$-electron systems, because strong intra-atomic spin-orbit coupling, an orbitally degenerate state inherently carries quadrupolar freedom. The present work has focused on purely quadrupole-active system ${\mathrm{PrIr}}_{2}{\mathrm{Zn}}_{20}$ showing superconductivity the presence antiferroquadrupole order at...

Inelastic neutron scattering studies of Pr\(T_{2}\)Zn20 (\(T\) = Ir, Rh, and Ru) were carried out in order to reveal \(f\) electron states indispensable for the low-temperature properties associated with multipole degrees freedom. Sharp excitation peaks, which are located within energies less than 10 meV, attributed crystal field splitting level schemes \(4f^{2}\) Pr3+ ions. Data Ir-based compound is explained by a non-Kramers doublet ground state local symmetry \(T_{d}\) this system....

We performed high-resolution powder neutron diffraction experiments and discovered an elliptic helical incommensurate magnetic structure in the semiconducting rare-earth magnet YbCuS2, featuring effective spin-1/2 Yb$^{3+}$ ions that form a zigzag chain. Upon cooling sample to 0.2 K, we observed very weak peaks indexed with propagation vector k = [0, 0.305, 0] along The magnitude of moment is at least one-third smaller than expected value for Kramers doublet ground state. In applied field,...

To investigate the paramagnetic properties of YbCuS2 under magnetic fields, we have performed 63/65Cu-nuclear resonance (NMR) measurements. The NMR spectra can be reproduced by simulations three-dimensional powder pattern and additional two-dimensional pattern, indicating partial sample orientation due to anisotropy properties. These suggest that ac plane is easy in YbCuS2. Knight shift K proportional bulk susceptibility field-independent. broad maximum nuclear spin-lattice relaxation rate...

We have investigated the surface and bulk electronic structures of superconducting type-II Dirac semimetal 1T-PdSeTe. The transition temperature <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>T</a:mi><a:mtext>c</a:mtext></a:msub><a:mo>=</a:mo><a:mn>3.2</a:mn></a:mrow></a:math> K was almost twice as high <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:msub><b:mi>T</b:mi><b:mtext>c</b:mtext></b:msub><b:mo>=</b:mo><b:mn>1.6</b:mn></b:mrow></b:math> in...

Magnetic entropy remaining near absolute zero temperature in the antiferromagnetic (AFM) critical state is expected to be usable for cryogenic magnetic refrigeration. In this paper, we report quasi-adiabatic demagnetization refrigeration Ce2(Cu1−xNix)2In (0≤x≤0.38) whose parent compound Ce2Cu2In orders antiferromagnetically below 6 K, by using a laboratory-made cell attachable commercial 4He refrigerator with base of 1.8 K. The final as function x indicates local minimum 1 K at AFM...

Spin splitting in electronic band structures via antiferromagnetic orders is a new route to control spin-polarized carriers that available for spintronics applications. Here, we investigated the spin degrees of freedom antiferromagnet NdBi using laser-based spin- and angle-resolved photoemission spectroscopy (laser-SARPES). Our laser-SARPES experiments revealed two surface bands appear state are polarized opposite directions as counterpart splitting. Moreover, observed polarization...

We report transport, thermal, and magnetic measurements on single crystalline samples of FeGa 3 prepared by a Ga self flux method. The electrical resistivity Hall coefficient at temperatures above 300 K display semiconducting behaviors with energy gaps 0.47 0.54 eV, respectively, whose values agree the calculated band gap. In saturation range 100–260 K, carrier mobility µ exhibits an unusual dependence temperature; µ( T )∝ -5/2 . thermopower has large negative minimum -350 µV/K K....

We report on the synthesis and measurements of magnetic susceptibility, electrical resistivity, specific heat R Os 2 Al 10 ( =Pr, Nd, Sm, Gd). All compounds are isostructural with a Kondo semiconductor CeOs showing an unusual phase transition at T 0 =28.6 K. For no transitions were observed down to 0.4 K, whereas =Nd, Gd undergo antiferromagnetic N = 2.2, 12.5, 18 respectively. Moreover, successive occur for =Sm Gd. The resistivity increases cooling below due superzone-gap formation. fact...

To investigate the origin of a phase transition at ${T}_{\mathrm{Q}}=0.06$ K simultaneously occurring with superconducting in cage compound PrRh${}_{2}$Zn${}_{20}$, we carried out ultrasonic measurements on single-crystalline sample. The transverse modulus (${C}_{11}\ensuremath{-}{C}_{12}$)/2 is intimately coupled to non-Kramers ground doublet ${\ensuremath{\Gamma}}_{3}$, and elastic softening observed low temperatures. Below ${T}_{\mathrm{Q}}$, stops, suggesting disappearance quadrupole...

Electrical resistivity $\ensuremath{\rho}(T)$ and specific heat $C(T)$ measurements have been made on the diluted $4{f}^{2}$ system $\mathrm{Y}(\mathrm{Pr}){\mathrm{Ir}}_{2}{\mathrm{Zn}}_{20}$. Both data of $\ensuremath{\rho}$ magnetic ${C}_{\mathrm{m}}$ per Pr ion are well scaled as a function $T/{T}_{0}$, where ${T}_{0}$ is characteristic temperature non-Fermi-liquid (NFL) behaviors. Furthermore, dependences ${C}_{\mathrm{m}}/T$ agree with NFL behaviors predicted by two-channel Kondo model...

Crystal structures of CeB 2 C and NdB were investigated by means neutron powder diffraction using 11 B enriched samples. Diffraction patterns Ce Nd are very similar to each other, Rietveld analyses reveal that the crystal structure belongs a symmetry group tetragonal P 4/ m b , where rare earth atoms occupy 2( ) sites two 4( h with different positional parameters. The newly determined differs from previously reported ones \(P{\overline 4}2c\) mainly in site positions occupied atoms. form...

We report the effects of electron doping on ground state a diamagnetic semiconductor FeGa$_{3}$ with band gap 0.5 eV. By means electrical resistivity, magnetization and specific heat measurements we have found that gradual substitution Ge for Ga in FeGa$_{3-y}$Ge$_{y}$ yields metallic conduction at very small level $y = 0.006$, then induces weak ferromagnetic (FM) order 0.13$ spontaneous moment 0.1 $\mu_{B}$/Fe Curie temperature $T_{C}= 3.3$ K, which continues increasing to $T_{C} 75$ K as...

We studied the low-temperature thermoelectric properties of single crystals Mg3Sb2−xBix (0 ≤ x 2) grown by Bridgman method. The are well aligned along hexagonal c axis as documented in huge anisotropy electrical resistivity; ρ//c/ρ⊥c = 100 for 2. Upon increasing x, semiconducting behaviour ρ(T) changes to metallic behaviour, and Seebeck coefficient S(T) at room temperature decreases from 590 μV K−1 0 67 Although thermal conductivity 300 K is low 0.88 W mK−1 0.7, large resistivity 1 Ωcm...

We have investigated atomic dynamics of caged compound ${\mathrm{LaRu}}_{2}{\mathrm{Zn}}_{20}$ by the measurements specific heat $C$ and inelastic x-ray scattering (IXS). The lattice part ${C}_{\mathrm{lat}}$ divided ${T}^{3},{C}_{\mathrm{lat}}/{T}^{3}$, shows a broad peak at around 15 K, which is reproduced two Einstein modes with characteristic temperatures ${\ensuremath{\theta}}_{\mathrm{E}1}=35$ K ${\ensuremath{\theta}}_{\mathrm{E}2}=82$ respectively. IXS along [111] [110] directions...

We report the synthesis and temperature-dependent structural, transport, thermal properties of type-II clathrate K${}_{8+x}$Ba${}_{16\ensuremath{-}x}$Ga${}_{40\ensuremath{-}y}$Sn${}_{96\ensuremath{-}z}$${\ensuremath{\square}}_{y+z}$ (1.2 $\ensuremath{\le}$ $x$ 2.8, 2.0 $y$ 3.3, 0.8 $z$ 6.6, $\ensuremath{\square}$ $=$ framework vacancy). Single-crystal x-ray diffraction analysis reveals that guest K${}^{+}$ Ba${}^{2+}$ ions are preferentially incorporated into hexakaidecahedral cages...