D. E. MacLaughlin
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View article: Muon spin relaxation and Knight shift in the heavy-fermion superconductor UPt/sub 3/
Muon spin relaxation and Knight shift in the heavy-fermion superconductor UPt/sub 3/ Open
Positive muon spin relaxation experiments have been conducted on the heavy-fermion superconductor UPt/sub 3/ in both the normal and superconducting states for zero, transverse, and longitudinally applied magnetic fields. Below 6 K in zero …
View article: Effects of superconductivity on rare-earth-ion dynamics in (Ho/sub x/Lu/sub 1-x/)Rh/sub 4/B/sub 4/
Effects of superconductivity on rare-earth-ion dynamics in (Ho/sub x/Lu/sub 1-x/)Rh/sub 4/B/sub 4/ Open
The temperature dependence of the Ho-ion fluctuation rate tau/sub m//sup -1/ in the pseudoternary compound Ho/sub x/Lu/sub 1-x/Rh/sub 4/B/sub 4/ is obtained using the zero-field muon spin relaxation technique, primarily for x = 0.02. A sha…
View article: Spin-liquid behavior and weak static magnetism in pyrochlore Pr2Ir2O7
Spin-liquid behavior and weak static magnetism in pyrochlore Pr2Ir2O7 Open
Muon spin relaxation experiments have been performed in powder samples of the pyrochlore iridate Pr{sub 2}Ir{sub 2}O{sub 7} for temperatures in the range 0.02-250 K. Two-component muon spin relaxation functions are observed up to {approx}&…
View article: The Search for Magnetic Order in delta-Pu metal using muon spin relaxation
The Search for Magnetic Order in delta-Pu metal using muon spin relaxation Open
We review results from previous muon spin relaxation ({mu}SR) measurements in applied fields of H{sub 0} = 0 and 0.25 T which established an upper limit for the ordered or disordered frozen spin moment above T = 4 K in {delta}-Pu (4.3 at. …
View article: Muon spin relaxation and fluctuating magnetism in the pseudogap phase of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mi>y</mml:mi></mml:msub></mml:mrow></mml:math>
Muon spin relaxation and fluctuating magnetism in the pseudogap phase of Open
We report results of a muon spin relaxation study of slow magnetic\nfluctuations in the pseudogap phase of underdoped single-crystalline\nYBa$_{2}$Cu$_{3}$O$_{y}$, $y = 6.77$ and 6.83. The dependence of the dynamic\nmuon spin relaxation ra…
View article: Intrinsic new properties of a quantum spin liquid
Intrinsic new properties of a quantum spin liquid Open
Quantum fluctuations are expected to lead to highly entangled spin-liquid states in certain two-dimensional spin-1/2 compounds. We have synthesized and measured thermodynamic properties and muon spin relaxation rates in the copper-based tw…
View article: Persistent spin dynamics and absence of spin freezing in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:mi>T</mml:mi></mml:mrow></mml:math> phase diagram of the two-dimensional triangular antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>YbMgGaO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>
Persistent spin dynamics and absence of spin freezing in the phase diagram of the two-dimensional triangular antiferromagnet Open
We report results of muon spin relaxation and rotation ($\\mu$SR) experiments\non the spin-liquid candidate~YbMgGaO$_{4}$. No static magnetism $\\gtrsim\n0.003\\mu_B$ per Yb ion, ordered or disordered, is observed down to 22~mK, a\nfactor …
View article: Slow magnetic fluctuations and critical slowing down in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Rh</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Slow magnetic fluctuations and critical slowing down in Open
Hidden magnetic order of Sr$_2$Ir$_{1-x}$Rh$_x$O$_4$, $x = 0.05$ and 0.1, has\nbeen studied using muon spin relaxation spectroscopy. In zero applied field and\nweak longitudinal fields ($\\mu_0H_L \\lesssim 2$~mT), muon spin relaxation dat…
View article: Muon spin rotation and relaxation in Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$: superconductivity and magnetism in Pr-rich alloys
Muon spin rotation and relaxation in Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$: superconductivity and magnetism in Pr-rich alloys Open
The Pr-rich end of the alloy series Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$ has been studied using muon spin rotation and relaxation. The end compound PrOs$_4$Sb$_{12}$ is an unconventional heavy-fermion superconductor, which exhibits a spontaneou…
View article: Charge-stripe order, antiferromagnetism, and spin dynamics in the cuprate-analog nickelate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>
Charge-stripe order, antiferromagnetism, and spin dynamics in the cuprate-analog nickelate Open
We report a muon spin rotation ($\\mu$SR) study of the cuprate-analog\nnickelate La$_4$Ni$_3$O$_8$, which undergoes a transition at 105 K to a\nlow-temperature phase with charge-stripe and antiferromagnetic (AFM) order on\nsquare planar Ni…
View article: Broken time-reversal symmetry in superconducting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Pr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Pt</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math>
Broken time-reversal symmetry in superconducting Open
The superconducting state of the filled skutterudite alloy series\nPr$_{1-x}$La$_{x}$Pt$_{4}$Ge$_{12}$ has been systematically studied by specific\nheat, zero-field muon spin relaxation ($\\mu$SR), and superconducting critical\nfield measu…
View article: Anomalous quantum critical spin dynamics in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>YFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Al</mml:mi><mml:mn>10</mml:mn></mml:msub></mml:mrow></mml:math>
Anomalous quantum critical spin dynamics in Open
We report results of a muon spin relaxation ($\\mu$SR) study of\nYFe$_2$Al$_{10}$, a quasi-2D nearly-ferromagnetic metal in which unconventional\nquantum critical behavior is observed. No static Fe$^{2+}$ magnetism, with or\nwithout long-r…
View article: Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa <sub>2</sub> Cu <sub>3</sub> O <sub> <i>y</i> </sub>
Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa <sub>2</sub> Cu <sub>3</sub> O <sub> <i>y</i> </sub> Open
Muon relaxation experiments reveal a slowly fluctuating magnetic field in the pseudogap phase of a cuprate superconductor.
View article: Reply to "Comment on `Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa$_2$Cu$_3$O$_y$' "
Reply to "Comment on `Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa$_2$Cu$_3$O$_y$' " Open
We reply to the objections raised in a recent Comment (arXiv:1706.03023) regarding our observation of slow magnetic fluctuations and critical slowing down of magnetic fluctuations in the pseudogap phase of YBa$_2$Cu$_3$O$_y$ by zero-field …
View article: Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa$_2$Cu$_3$O$_y$
Discovery of slow magnetic fluctuations and critical slowing down in the pseudogap phase of YBa$_2$Cu$_3$O$_y$ Open
Evidence for intra-unit-cell (IUC) magnetic order in the pseudogap region of high-$T_c$ cuprates below a temperature $T^\ast$ is found in several studies, but NMR and $μ$SR experiments do not observe the expected static local magnetic fiel…
View article: Quantum criticality and inhomogeneous magnetic order in Fe-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>α</mml:mi><mml:mo>−</mml:mo><mml:msub><mml:mi>YbAlB</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Quantum criticality and inhomogeneous magnetic order in Fe-doped Open
The intermediate-valent polymorphs $\alpha$- and $\beta$-YbAlB$_4$ exhibit quantum criticality and other novel properties not usually associated with intermediate valence. Iron doping induces quantum criticality in $\alpha$-YbAlB$_4$ and m…
View article: Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice
Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice Open
The temporal magnetic correlations of the triangular-lattice antiferromagnet NiGa_{2}S_{4} are examined through 13 decades (10^{-13}-1 sec) using ultrahigh-resolution inelastic neutron scattering, muon spin relaxation, and ac and nonlinear…
View article: Unstable spin-ice order in the stuffed metallic pyrochlore<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Pr</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Unstable spin-ice order in the stuffed metallic pyrochlore Open
Specific heat, elastic neutron scattering, and muon spin rotation experiments have been carried out on a well-characterized sample of “stuffed” (Pr-rich) Pr2+xIr2-xO7-δ. Elastic neutron scattering shows the…
View article: Broken time-reversal symmetry in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pt</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ge</mml:mi></mml:mrow><mml:mn>12</mml:mn></mml:msub></mml:math>
Broken time-reversal symmetry in superconducting Open
We report results of zero-field muon spin relaxation experiments on the filled-skutterudite superconductors~Pr$_{1-x}$Ce$_{x}$Pt$_4$Ge$_{12}$, $x = 0$, 0.07, 0.1, and 0.2, to investigate the effect of Ce doping on broken time-reversal symm…