Although muon spin relaxation is commonly used to probe local magnetic order, freezing, and dynamics, we identify an experimental situation in which the measured response dominated by effect resulting from muon-induced distortion rather than intrinsic behavior of host compound. We demonstrate this some quantum ice candidate materials ${\mathrm{Pr}}_{2}{B}_{2}{\mathrm{O}}_{7}$ ($B=\mathrm{Sn}$, Zr, Hf), where detect a static distribution moments that appears grow on cooling. Using density...

Magnetostriction results from the coupling between magnetic and elastic degrees of freedom. Though it is associated with a relatively small energy, we show that plays an important role in determining site implanted muon, so energetically favorable can switch on crossing phase transition. This surprising effect demonstrated cubic rocksalt antiferromagnet MnO which undergoes magnetostriction-driven rhombohedral distortion at Néel temperature TN=118 K. Above TN, muon becomes delocalized around...

We find evidence that the newly discovered Fe-based superconductor ${\mathrm{KCa}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}\phantom{\rule{4pt}{0ex}}({T}_{c}=33.36(7)$ K) displays multigap superconductivity with line nodes. Transverse field muon spin rotation $(\ensuremath{\mu}\mathrm{SR})$ measurements show temperature dependence of superfluid density does not have expected behavior a fully gapped superconductor, due to lack saturation at low temperatures. Moreover, data cannot...

We report the results of a muon-spin rotation ($\ensuremath{\mu}\mathrm{SR}$) experiment to determine superconducting ground state iron-based superconductor ${\mathrm{CsCa}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{\mathrm{F}}_{2}$ with ${T}_{\mathrm{c}}\ensuremath{\approx}28.3\phantom{\rule{0.28em}{0ex}}\mathrm{K}$. This compound is related fully gapped ${\mathrm{CaCsFe}}_{4}{\mathrm{As}}_{4}$, but here Ca-containing spacer layer replaced one containing ${\mathrm{Ca}}_{2}{\mathrm{F}}_{2}$. The...

The low-temperature fluorination of the n = 2 Ruddlesden-Popper phase La2SrCr2O7 yields La2SrCr2O7F2 via a topochemical fluorine insertion reaction. structure-conserving nature reaction means that chromium centers initial oxide retain an octahedral coordination environment in fluorinated product, resulting material containing extended array apex-linked Cr(4+)O6 units. Typically materials networks octahedrally coordinated Cr(4+) can only be prepared at high pressure; thus, preparation...

Muon spin rotation measurements have been performed on a powder sample of $\ensuremath{\alpha}\ensuremath{-}{\mathrm{RuCl}}_{3}$, layered material in which Ru ions are arranged honeycomb lattice and previously has proposed to be close quantum liquid ground state. Our data reveal two distinct transitions at 11 14 K, we interpret as originating from the onset three-dimensional order in-plane magnetic order, respectively. We identify, with help density functional theory calculations, likely...

Structural characterization by neutron diffraction, supported magnetic, SHG, and μ(+)SR data, reveals that the n = 2 Ruddlesden-Popper phase La2SrCr2O7 adopts a highly unusual structural configuration in which cooperative rotations of CrO6 octahedra are out all three Cartesian directions (ΦΦΦz/ΦΦΦz; a(-)a(-)c(-)/a(-)a(-)c(-)) as described space group A2/a. First-principles DFT calculations indicate this arrangement can be attributed to coupling between La/Sr A-site distribution units,...

The synthesis of the first 4d transition metal oxide-hydride, LaSr3 NiRuO4 H4 , is prepared via topochemical anion exchange. Neutron diffraction data show that hydride ions occupy equatorial sites in host lattice and as a result Ru Ni cations are located plane containing only ligands, unique structural feature with obvious parallels to CuO2 sheets present superconducting cuprates. DFT calculations confirm presence S=1/2 Ni+ S=0, Ru2+ centers, but neutron μSR no evidence for long-range...

The superconducting properties of the recently discovered double Fe$_2$As$_2$ layered high-$T_c$ superconductor RbCa$_2$Fe$_4$As$_4$F$_2$ with $T_c\approx$ 30~K have been investigated using magnetization, heat capacity, transverse-field (TF) and zero-field (ZF) muon-spin rotation/relaxation ($\mu$SR) measurements. Our low field magnetization measurements capacity (C$_p$) reveal an onset bulk superconductivity $T_{\bf c}\sim$ 30.0(4) K. Furthermore, exhibits a jump at c}$...

We have determined the superconducting and magnetic properties of a hydrothermally synthesized powder sample tetragonal FeS using muon spin rotation ({\mu}SR). The are entirely consistent with those recently published study, showing fully gapped behavior giving penetration depth {\lambda}_{ab} = 204(3) nm. However, our zero-field {\mu}SR data rather different indicate presence small, non-superconducting phase within sample. These results highlight that sample-to-sample variations in...

We have used neutron powder diffraction to solve the magnetic structure of orthorhombic CoTi$_2$O$_5$, showing that long-range ordered state below 26 K identified in our muon-spin rotation experiments is antiferromagnetic with propagation vector ${\bf k}=(\pm \frac{1}{2}, 0)$ and moment 2.72(1)$\mu_{\rm B}$ per Co$^{2+}$ ion. This long range order incompatible experimentally determined crystal because imposed symmetry completely frustrates exchange coupling. conclude transition must...

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...

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...

We have used muon-spin rotation, heat capacity, and x-ray diffraction measurements in combination with density functional theory dipole field calculations to investigate the crystal magnetic structure of ${\mathrm{FeTi}}_{2}{\mathrm{O}}_{5}$. observe a long-range ordered state below ${T}_{\mathrm{N}}=41.8(5)\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ indications significant correlations existing above this temperature. determine candidate muon stopping sites compound, find that our data are...

We report magnetic, transport, neutron diffraction, and muon spin rotation data showing that ${\mathrm{Pb}}_{2}{\mathrm{CoOsO}}_{6}$, a metallic double-perovskite with centrosymmetric space group at room temperature exhibits continuous second-order phase transition 45 K to magnetically ordered state noncentrosymmetric group. The absence of inversion symmetry is very uncommon in metals, particularly oxides. In contrast the recently reported ferroelectriclike structural ${\mathrm{LiOsO}}_{3}$,...

Reaction of the n = 1 Ruddlesden–Popper oxide LaSr3CoRuO8 with CaH2 yields oxyhydride phase LaSr3CoRuO4H4 via a topochemical anion exchange. Close inspection X-ray and neutron powder diffraction data in combination HAADF-STEM images reveals that nanoparticles SrO are exsolved from system during reaction, change cation stoichiometry accommodated by inclusion > (Co/Ru)nOn+1H2n "perovskite" layers into stacking sequence. This novel pseudotopochemical process offers new route for formation...

Abstract The synthesis of the first 4d transition metal oxide–hydride, LaSr 3 NiRuO 4 H , is prepared via topochemical anion exchange. Neutron diffraction data show that hydride ions occupy equatorial sites in host lattice and as a result Ru Ni cations are located plane containing only ligands, unique structural feature with obvious parallels to CuO 2 sheets present superconducting cuprates. DFT calculations confirm presence S= + S=0, 2+ centers, but neutron μSR no evidence for long‐range...

We derive an analytical solution for the demagnetization tensor of a cylinder finite size and uniform magnetization in both Cartesian cylindrical coordinate systems, by employing recently developed Fourier space approach. Simple arguments are given to show that previously published using this approach is incomplete, detailed comprehensive derivation containing necessary corrections given. The corrected result shown be agreement with older solutions based on electrostatic potential...

Abstract We report inelastic neutron scattering (INS) investigations on the bilayer Fe-based superconductor CsCa 2 Fe 4 As F above and below its superconducting transition temperature T c ≈ 28.9 K to investigate presence of a spin resonance. This compound crystallises in body-centred tetragonal lattice containing asymmetric double layers separated by insulating CaF is known be highly anisotropic. Our INS study clearly reveals resonance that exhibits higher intensity at lower momentum...

LiOsO$_3$ is the first example of a new class material called ferroelectric metal. We performed zero-field and longitudinal-field $\mu$SR, along with combination electronic structure dipole field calculations, to determine magnetic ground state LiOsO$_3$. find that sample contains both static Li nuclear moments dynamic Os moments. Below $\approx 0.7\,$K, fluctuations slow down, though remain down 0.08$\,$K. expect this could result in frozen-out, disordered at even lower temperatures.

Abstract Molecular magnets are one of the key research themes µ SR, but locating muon stopping site in these compounds using density functional theory is often very challenging as their unit cells tend to contain a large number atoms. Nevertheless, many molecular [PF 6 ] − and [BF 4 ions, which, due fluorine nuclei, produce distinctive SR spectrum, which can give information about site. This paper details calculation sites much simpler materials KPF KBF , providing insights be applied...

Abstract LF- µ SR studies have previously been used to study the diffusive 1D motion of solitons and polarons in conducting polymers. This type was also applied investigating spinons spin-1/2 antiferromagnetic chains. Recently method has extended examples 2D layered triangular spin lattices which can support quantum liquid states, such as 1T-TaS 2 YbZnGaO 4 . These systems are found show dynamics that matches well diffusion, a model being provide much better fit data than proposed models for...

Magnetostriction drives a rhombohedral distortion in the cubic rock salt antiferromagnet MnO at N\'eel temperature $T_{N}=118$ K. As an unexpected consequence we show that this acts to localize site of implanted muon due accompanying redistribution electron density. This lifts degeneracy between equivalent sites, resulting single observed precession frequency. Above $T_{N}$, instead becomes delocalized around network sites. Our first-principles simulations based on Hubbard-corrected...