High-precision dc magnetization measurements have been made on Cu(C4H4N2) (NO3)2 in magnetic fields up to 14.7 T, slightly above the saturation field Hs=13.97 temperature range from 0.08 15 K. The curve and differential susceptibility at lowest show excellent agreement with exact theoretical results for spin-1/2 Heisenberg antiferromagnet one dimension. A broad peak is observed measured as a function of temperature, signaling crossover low-temperature Tomonaga-Luttinger-liquid regime. With...

East Japan Railway Company (JR East) has developed the catenary and storage battery hybrid train system using a test car for purpose of through operation service between electrified section non-electrified decreasing environmental impact diesel trains operating. We will develop commercial Series EV-E301 applied this start in March 2014. introduce technical items paper.

A hidden order that emerges in the frustrated pyrochlore Tb$_{2+x}$Ti$_{2-x}$O$_{7+y}$ with $T_{\text{c}}=0.53$ K is studied using specific heat, magnetization, and neutron scattering experiments on a high-quality single crystal. Semi-quantitative analyses based pseudospin-1/2 Hamiltonian for ionic non-Kramers magnetic doublets demonstrate it an ordered state of electric quadrupole moments. The elusive spin liquid nominal Tb$_2$Ti$_2$O$_7$ most likely U(1) quantum spin-liquid state.

This study is motivated by a challenge to the third law of thermodynamics: how does degenerated ground state in textbook example behave real compound? At very low temperatures, nature tries preserve basic using small perturbations and novel quantum should appear. The authors here classic frustrated magnet Ba${}_{3}$Yb${}_{2}$Zn${}_{5}$O${}_{11}$, spin tetrahedron having two-fold degeneracy realized breathing pyrochlore lattice. They measure inelastic neutron scattering low-energy excitations...

Quantum entanglement in magnetic materials is expected to yield a quantum spin liquid (QSL), which strong fluctuations prevent ordering even at zero temperature. This topic has been one of the primary focuses condensed-matter science since Anderson first proposed resonating valence bond state certain spin-1/2 frustrated magnet 1973. Since then, several candidate featuring frustration, such as triangular and kagome lattices, have reported exhibit liquid-like behavior. However, mechanisms that...

The Grüneisen ratio Γ and its magnetic analog, the ΓH, are powerful probes to study nature of quantum phase transitions. Here, we propose a parameter, rotational Γϕ, by introducing orientation external field as control parameter. We investigate Γϕ highly anisotropic paramagnets CeRhSn CeIrSn measuring magnetocaloric effect in wide range temperatures fields. find that data both compounds scaled using same critical exponents field-invariant angle. Remarkably, scaling function for reveals...

We have succeeded in synthesizing single crystals of the verdazyl radical beta-2,6-Cl2-V [= beta-3-(2,6-dichlorophenyl)-1,5-diphenylverdazyl]. The ab initio MO calculation indicated formation an S = 1/2 Heisenberg antiferromagnetic chain with four-fold magnetic periodicity consisting three types exchange interactions.We successfully explained and thermodynamic properties based on expected spin model by using quantum Monte Carlo method. Furthermore, we revealed that alternating unique Ising...

We successfully synthesized the zinc-verdazyl complex [Zn(hfac)$_2$]$\cdot$($o$-Py-V) [hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate; $o$-Py-V 3-(2-pyridyl)-1,5-diphenylverdazyl], which is an ideal model compound with $S$ 1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain (F-AF AHC). $Ab$ $initio$ molecular orbital (MO) calculations indicate that two dominant interactions $J_{\rm{F}}$ and $J_{\rm{AF}}$ form $S=1/2$ F-AF AHC in this compound. The magnetic susceptibility specific...

High-precision angle-resolved dc magnetization and magnetic torque studies were performed on a single-crystalline sample of URhGe, an orthorhombic Ising ferromagnet with the $c$ axis being easy axis, in order to investigate phase diagram around ferromagnetic (FM) reorientation transition field near $b$ axis. We have clearly detected first-order both at low temperatures, determined detailed profiles wing structure three-dimensional $T$-$H_{b}$-$H_{c}$ diagram, where $H_{c}$ $H_{b}$ denotes...

We present a new model compound with the S = 1/2 frustrated square lattice composed of charge-transfer salt (o-MePy-V)PF6. Ab initio calculations indicate formation an lattice, in which six types nearest-neighbor ferromagnetic- and antiferromagnetic interactions cause frustration. By applying magnetic field, we observe unusually gradual increase magnetization subsequent 1/2-plateau-like behavior. A numerical analysis using tensor network method qualitatively demonstrates such behaviors...

The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is an exotic superconducting phase formed by Cooper pairs with finite center-of-mass momentum $q$. On theoretical grounds, the order parameter in FFLO spatially modulated along $q$ vector, and emergence of associated anisotropy expected at transition from Abrikosov to state. Here, we report results high-resolution magnetostriction measurements for a single crystal CeCoIn$_5$ around $B \parallel c$. We find two anomalies $c$ axis, parallel...

We demonstrate an advanced spin-system design using a hybrid spin consisting of strongly coupled metal ion and verdazyl radical. Ab initio calculation, magnetization, ESR measurements evidenced the first realization $S=2$ ferromagnetic-antiferromagnetic alternating chain with Ising anisotropy in Mn-verdazyl complex $[{\mathrm{Mn}(\mathrm{hfac})}_{2}]\ifmmode\cdot\else\textperiodcentered\fi{}(o\ensuremath{-}\mathrm{Py}\ensuremath{-}\mathrm{V})$ [hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate;...

We have succeeded in synthesizing single crystals of an organic radical $p$-Br-V [3-(4-bromophenyl)-1,5-diphenylverdazyl]. The dominant intermolecular interactions forming a one-dimensional spin chain are deduced from the molecular packing crystal, and ab initio orbital calculation also indicates such exchange network. analyzed magnetic susceptibility, magnetization curve, specific heat through quantum Monte Carlo method successfully explained them as being attributed to $S=\frac{1}{2}$...

We have succeeded in synthesizing two types of new organic radical crystals 3-I-V [= 3- (3-iodophenyl)-1,5-diphenylverdazyl] and 3-Br-4-F-V 3-(3-bromo-4-fluorophenyl)-1,5- diphenylverdazyl]. Their crystal strucutures are found to be isomorphous that previously reported spin ladder 3-Cl-4-F-V. Through the quantitative analysis their molecular arrangements magnetic properties, we confirm these materials form ferromagnetic chain-based ladders with slightly modulated interactions. These results...

We have succeeded in growing single crystals of the heavy-fermion superconductor CeCo(In1-xZnx)5 with x<=0.07. Measurements specific heat, electrical resistivity, dc magnetization and ac susceptibility revealed that superconducting (SC) transition temperature Tc decreases from 2.25 K (x=0) to 1.8 (x=0.05) by doping Zn into CeCoIn5. Furthermore, these measurements indicate a development new ordered phase below T_o ~ 2.2 for x=>0.05, characterized reduced resistivity phase, enhancement heat at...

Abstract Topological properties in material science have recently received tremendous attention, as exemplified by topological insulators. As for quantum spin systems, the Haldane chain with integer spins is best known example 1 . The realization of a phase an innovative research development related to 2016 Nobel Prize Physics. For mixed chains composed two different spins, appearance topologically quantized magnetization plateau predicted Lieb-Mattis theorem 2 combination...

We present a model compound with spin-$\frac{1}{2}$ spatially anisotropic frustrated square lattice, in which three antiferromagnetic interactions and one ferromagnetic interaction are competing. observe an unconventional gradual increase the low-temperature magnetization curve reminiscent of quantum critical behavior between gapped gapless phases. In addition, specific heat electron spin resonance signals indicate one-dimensional characteristics. These results demonstrate associated...

We present an $S=1/2$ antiferromagnetic (AF) honeycomb lattice composed of a verdazyl-based complex $[\mathrm{Zn}{(\mathrm{hfac})}_{2}][o$-Py-V-(4-${\mathrm{F})}_{2}]$. Ab initio molecular orbital calculations indicate that two AF interactions and ferromagnetic interaction lead to the formation lattice. explain magnetic susceptibility, magnetization curve, specific heat based on $S$ = 1/2 Heisenberg using quantum Monte Carlo method. Further, by considering distortion effect behavior, we...

High-sensitivity capacitive Faraday magnetometers were developed for static DC magnetization measurements in a sub-Kelvin region that can be used with 3He-4He dilution refrigerators (∼50 mK) and 3He (∼0.28 K). For high-resolution measurements, the background of force-sensing capacitor should as small possible, compared value measured specimen. In this study, we succeeded reducing both low- high-field regions by compensating diamagnetic response thin quartz plate, making use...

We report the crystal structure, magnetic properties, and phase diagrams of single crystalline DyNi3Ga9 studied using X-ray diffraction, electrical resistivity, specific heat, magnetization measurements. crystallizes in chiral structure with space group R32. The dysprosium ions, which are responsible for magnetism this compound, form a two-dimensional honeycomb on (0001) plane. show that exhibits successive transitions at TN = 10 K \(T'_{\text{N}} 9\) K. former suggests quadrupolar ordering,...

We report on the anisotropic properties of Pauli-limited superconductivity (SC) and antiferromagnetism (AFM) in solid solutions CeCo(In_{1-x}Zn_x)_5 (x<=0.07). In CeCo(In_{1-x}Zn_x)_5, SC transition temperature T_c is continuously reduced from 2.3 K (x=0) to ~1.4 (x=0.07) by doping Zn, then AFM order with T_N~2.2 develops for x larger than ~0.05. The present thermal, transport magnetic measurements under field B reveal that substitution Zn yields little change low-temperature upper critical...

We present low-temperature specific heat and magnetization measurements of the $S$ = 1/2 organic spin ladder 3-I-V [3-(3-iodophenyl)-1,5-diphenylverdazyl]. $Ab\phantom{\rule{4.pt}{0ex}}initio$ molecular orbital calculations indicate existence an intraladder diagonal interaction ${J}_{\mathrm{diag}}$ three types interladder interactions. The ferromagnetic induces frustration in ladder, which has essential contribution to ground state. obtained phase diagram exhibits a low-field...

Trinuclear M(II)-Gd(III)-M(II) complexes 1 (M = Zn), 2 Mg), and the magnetically dilute sample 1′ were synthesized slow magnetization relaxation originating from Gd(III) ions was investigated in detail. These are crystallographically isostructural belong to D3 point group symmetry, with M-Gd-M arrayed on crystallographic 3-fold axis. From angular-resolved of a single crystal 1, an easy-axis-type magnetic anisotropy parameter D −0.21(3) K revealed. All underwent under application external...

Low-temperature (T) thermodynamic properties of the quasi-Kagome antiferromagnet CePdAl (TN ∼ 2.7 K) in magnetic fields (B) were studied by magnetization and specific-heat C(T, B) measurements. The unusual phase diagram, including three phases I–III crossover anomalies, has been obtained. In low-field I, existence partial Kondo screening state on one-third Ce sites is supported from following view points: (i) appearance a paramagnetic moment with full around 3 T (ii) occurrence an entropy...

We present a model compound with spin-1/2 frustrated square lattice, in which three ferromagnetic (F) interactions and one antiferromagnetic (AF) compet. Considering the effective spin-1 formed by dominant F dimer, this lattice can be mapped to spatially anisotropic triangular lattice. The magnetization curve exhibits gapped behavior indicative of one-dimensional (1D) AF correlation. In field-induced gapless phase, specific heat magnetic susceptibility show phase transition an ordered state...