Abstract The 2-dimensional layered oxide material SrCu 2 (BO 3 ) , long studied as a realization of the Shastry-Sutherland spin topology, exhibits range intriguing physics function both hydrostatic pressure and magnetic field, with still debated intermediate plaquette phase appearing at approximately 20 kbar possible deconfined critical point higher pressure. Here, we employ tunnel diode oscillator (TDO) technique to probe behavior in combined extreme conditions high pressure, low...

The emergence of a quantum spin liquid (QSL), state matter that can result when electron spins are highly correlated but do not become ordered, has been the subject considerable body research in condensed physics [1,2]. Spin states have proposed as hosts for high-temperature superconductivity [3] and host topological properties with potential applications information science [4]. excitations most liquids conventional waves rather quasiparticles known spinons, whose existence is well...

Quantum criticality is a central concept in condensed matter physics, but the direct observation of quantum critical fluctuations has remained elusive. Here we present an X-ray diffraction study charge density wave (CDW) 2 H -NbSe at high pressure and low temperature, where observe broad regime order parameter that are controlled by proximity to point. X-rays can track CDW despite fact shrouded inside superconducting phase; contrast transport probes, allow measurement order. Concurrent...

Abstract An exact mapping between quantum spins and boson gases provides fresh approaches to the creation of condensates crystals. Here we report on magnetization measurements dimerized magnet SrCu 2 (BO 3 ) at cryogenic temperatures through a quantum-phase transition that demonstrate emergence fractionally filled bosonic crystals in mesoscopic patterns, specified by sequence plateaus. We apply tens Teslas magnetic field tune density bosons gigapascals hydrostatic pressure regulate...

We investigate the thermodynamic properties of ytterbium-based triangular lattice compound Ba3Yb(BO3)3. The results demonstrate absence any long-range ordering down to 56 mK. Analysis magnetization, susceptibility and specific heat measurements suggests that Ba3Yb(BO3)3 may realize a S = 1/2 quantum dipole lattice, in which dominant interaction is long range dipole-dipole coupling on geometrically frustrated exchange interactions are subdominant or negligible.

High-resolution, inelastic neutron scattering measurements on SrCu2(BO3)2, a realization of the Shastry-Sutherland model for two-dimensional Heisenberg antiferromagnets, reveal dispersion three single triplet excitations continuously across (H,0) direction within its tetragonal basal plane. These also show distinct Q dependencies and multiple excitations, that these are largely dispersionless perpendicular to this The temperature dependence intensities is well described as complement dc...

The Shasty–Sutherland model, which consists of a set spin 1/2 dimers on 2D square lattice, is simple and soluble but captures central theme condensed matter physics by sitting precariously the quantum edge between isolated, gapped excitations collective, ordered ground states. We compress model Shastry–Sutherland material, SrCu 2 (BO 3 ) , in diamond anvil cell at cryogenic temperatures to continuously tune coupling energies induce changes state. High-resolution X-ray measurements exploit...

Quantum spins placed on the corners of a square lattice can dimerize and form singlets, which then be transformed into magnetic state as interactions between dimers increase beyond threshold. This is strictly 2D transition in theory, but real-world materials often need third dimension to stabilize long-range order. We use high pressures convert sheets Cu(2+) spin 1/2 from local singlets global antiferromagnet model system SrCu2(BO3)2. Single-crystal neutron diffraction measurements at above...

Abstract Ba 3 Yb 2 Zn 5 O 11 is exceptional among breathing pyrochlore compounds for being in the nearly-decoupled limit where inter-tetrahedron interactions are weak, hosting isolated clusters or molecular magnet-like tetrahedra of magnetic ytterbium (Yb 3+ ) ions. In this work, we present study carried out on single-crystal samples , using a variety magnetometry and neutron scattering techniques along with theoretical modeling. We employ inelastic to investigate dynamics as function...

Abstract Geometric frustration commonly occurs in materials where magnetic rare-earth ions are arranged on a two-dimensional triangular lattice. These compounds have been gaining significant attention lately, as they hold the promise of revealing unique quantum states matter. However, little has devoted to cases spin- $$\frac{1}{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mn>2</mml:mn> </mml:mfrac> </mml:math>...

The realization and discovery of quantum spin liquid (QSL) candidate materials are crucial for exploring exotic phenomena applications associated with QSLs. Most existing metal–organic two-dimensional (2D) candidates have structures spins arranged on the triangular or kagome lattices, whereas honeycomb-structured compounds QSL characteristics rare. Here, we report use 2,5-dihydroxy-1,4-benzoquinone (X2dhbq, X = Cl, Br, H) as linkers to construct cobalt(II) honeycomb lattices...

Abstract Impurities often play a defining role in the ground states of frustrated quantum magnets. Studies their effects are crucial understanding phase diagram these materials. SrCu 2 (BO 3 ) , an experimental realization Shastry-Sutherland (SS) lattice, provides unique model system for such studies using both and numerical approaches. Here we report impurities on crystals bound states, doping-induced emergent Mg-doped which remain stable high magnetic fields. Using four complementary...

The emergence of a quantum spin liquid (QSL), state matter that can result when electron spins are highly correlated but do not become ordered, has been the subject considerable body research in condensed physics. Spin states have proposed as hosts for high-temperature superconductivity and host topological properties with potential applications information science. excitations most liquids conventional waves rather quasiparticles known spinons, whose existence is well established...

Electron spin dynamics was studied down to 80 mK in the triangular-lattice quantum spin-liquid candidate ${\mathrm{YbZnGaO}}_{4}$ using muon relaxation, finding no evidence for freezing or ordering of Yb spins. The relaxation rate can be represented by sum two contributions, one dependent on longitudinal magnetic field and other independent field. field-dependent term follows form expected two-dimensional diffusion mobile excitations. spin-diffusion obtained these excitations high...

High resolution neutron scattering measurements on a single crystal of ${\mathrm{SrCu}}_{2\ensuremath{-}x}{\mathrm{Mg}}_{x}({\mathrm{BO}}_{3}{)}_{2}$ with $x\ensuremath{\sim}0.05$ reveal the presence new spin excitations within gap this quasi-two-dimensional, singlet ground state system. The application magnetic field induces Zeeman-split states associated $S=1/2$ unpaired spins which are antiferromagnetically correlated bulk singlet. Substantial broadening both one- and two-triplet in doped...

Recently, a new class of quantum magnets, the so-called breathing pyrochlore spin systems, have attracted much attention due to their potential host exotic emergent phenomena. Here, we present magnetometry, heat capacity, thermal conductivity, muon-spin relaxation, and polarized inelastic neutron scattering measurements performed on high-quality single crystal samples compound ${\mathrm{Ba}}_{3}{\mathrm{Yb}}_{2}{\mathrm{Zn}}_{5}{\mathrm{O}}_{11}$. We interpret these results using simplified...

Geometrically frustrated magnetic systems, such as those based on the Shastry-Sutherland lattice, offer a rich playground for exploring unconventional states. The delicate balance between competing interactions in these systems leads to emergence of novel phases. We present characterization Er2Be2GeO7, an SSL compound with Er3+ ions forming orthogonal dimers separated by non-magnetic layers. Neutron scattering reveals antiferromagnetic dimer structure at zero field, typical Ising spins that...

We report the observation of a two-dimensional (2D) checkerboard charge density wave (CDW) in low-dimensional superconductor Ta4Pd3Te16. By determining its CDW properties across temperature-pressure (T−P) phase diagram and comparing with prototypical materials, we conclude that Ta4Pd3Te16 features (a) an incommensurate mixed character dimensions [quasi-1D (Q1D) considering needlelike shape along b axis, Q2D as has vectors, 3D because projections all three axes], (b) one weakest CDWs compared...

Abstract Recently, Yb-based triangular-lattice antiferromagnets have garnered significant interest as possible quantum spin-liquid candidates. One example is YbMgGaO 4 , which showed many promising features, but also possesses a high degree of disorder owing to site-mixing between the non-magnetic cations. To further elucidate role chemical and explore phase diagram these materials in applied field, we present neutron scattering sensitive magnetometry measurements closely related compound,...

We report the first observation of long-range magnetic order in chromic compound CuMoO 4 at 1.75 K by means a specific heat measurement zero field. Magnetization measurements performed up to 57 T 4.2 indicate plateau 1/3 saturated magnetization consistent with simple model two non-interacting Cu 2+ spins and isolated antiferromagnetic dimers ( J / k B = 26 K). A large temperature-hysteresis susceptibility is observed originate from structural phase transition be closely related chromism...

MnP is a metal that shows successive magnetic transitions from paramagnetic to ferromagnetic and helical phases at ambient pressure with decreasing temperature. With applied pressure, the transition temperatures decrease superconductivity appears around 8 GPa where order fully suppressed quantum critical behavior observed. These results suggest an unconventional superconductor in which fluctuations may be relevant superconducting pairing mechanism. In elucidate ground state adjacent phase...

The quantum spin liquid (QSL) state is an exotic of matter featuring a high degree entanglement and lack long-range magnetic order in the zero-temperature limit. triangular antiferromagnet ${\mathrm{YbMgGaO}}_{4}$ candidate QSL host, precise determination Hamiltonian parameters critical to understanding nature possible ground states. However, presence chemical disorder has made directly measuring these challenging. Here we report neutron scattering susceptibility measurements covering broad...