Spehling, J., Heffner, R. H., Sonier, J. E., Curro, N., Wang, C. H., Hitti, B., ...
The high field superconducting state in CeCoIn5 has been studied by transverse field muon spin rotation measurements with an applied field parallel to the crystallographic c-axis close to the upper...
Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4 (2008)
MacLaughlin, D. E., Nambu, Y., Nakatsuji, S., Heffner, R. H., Shu, Lei, Bernal, O. O., ...
Muon spin rotation (muSR) experiments reveal unconventional spin freezing and dynamics in the two-dimensional (2D) triangular lattice antiferromagnet NiGa2S4. Long-lived disordered Ni-spin freezing...
Weak quasistatic magnetism in the frustrated Kondo lattice Pr_2Ir_2O_7 (2008)
MacLaughlin, D. E., Ohta, Y., Machida, Y., Nakatsuji, S., Luke, G. M., Ishida, K., ...
Muon spin relaxation experiments have been performed in the pyrochlore iridate Pr_2Ir_2O_7 for temperatures in the range 0.025-250 K. Kubo-Toyabe relaxation functions are observed up to > 200 K,...
Shu, Lei, MacLaughlin, D. E., Beyermann, W. P., Heffner, R. H., Morris, G. D., Bernal, O. O., ...
Transverse-field muon spin rotation ($\mu$SR) experiments in the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$ ($T_{c}=1.85$ K) suggest that the superconducting penetration depth $\lambda(T)$ is...
Ohishi, K., Heffner, R. H., Morris, G. D., Bauer, E. D., Graf, M. J., ...
We have measured the temperature dependence and magnitude of the superfluid density $\rho_{\rm s}(T)$ via the magnetic field penetration depth $\lambda(T)$ in PuCoGa$_5$ (nominal critical temperature...
Multiband superconductivity and penetration depth in PrOs4Sb12 (2007)
MacLaughlin, D. E., Shu, Lei, Heffner, R. H., Sonier, J. E., Callaghan, F. D., Morris, G. D., ...
The effective superconducting penetration depth measured in the vortex state of PrOs4Sb12 using transverse-field muon spin rotation (TF-muSR) exhibits an activated temperature dependence at low...
Shu, Lei, MacLaughlin, D. E., Aoki, Y., Tunashima, Y., Yonezawa, Y., Sanada, S., ...
Zero- and longitudinal-field muon spin relaxation (MuSR) experiments have been carried out in the alloy series Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12 to elucidate the anomalous dynamic muon spin...
Critical slowing down in the geometrically frustrated pyrochlore antiferromagnet Gd_2Ti_2O_7 (2005)
MacLaughlin, D. E., Rose, M. S., Anderson, J. E., Shu, Lei, Heffner, R. H., Kimura, T., ...
Longitudinal-field muon spin relaxation experiments have been carried out in the paramagnetic state of single-crystal Gd_2Ti_2O_7 just above the phase transition at T_m = 1.0 K. At high applied...
Effect of annealing on glassy dynamics and non-Fermi liquid behavior in UCu_4Pd (2005)
MacLaughlin, D. E., Rose, M. S., Anderson, J. E., Bernal, O. O., Heffner, R. H., Nieuwenhuys, G. J., ...
Longitudinal-field muon spin relaxation (LF-muSR) experiments have been performed in unannealed and annealed samples of the heavy-fermion compound UCu_4Pd to study the effect of disorder on non-Fermi...
Susceptibility inhomogeneity and non-Fermi liquid behavior in UCu_{5-x}Pt_x (2005)
MacLaughlin, D. E., Rose, M. S., Bernal, O. O., Heffner, R. H., Nieuwenhuys, G. J., Chau, R., ...
Transverse-field muSR shifts and relaxation rates have been measured in the non-Fermi liquid (NFL) alloy system UCu_{5-x}Pt_x, x = 1.0, 1.5, and 2.5. At low temperatures the fractional spread in...
New limits on the ordered moments in alpha-Pu and Ga-stabilized delta-Pu (2005)
Heffner, R. H., Morris, G. D., Fluss, M. J., Chung, B., MacLaughlin, D. E., Shu, L., ...
We present the first muon spin relaxation measurements ever performed on elemental Pu, and set the most stringent upper limits to date on the magnitude of the ordered moment in alpha-Pu and...
Evolution of the heavy fermion state in Ce2IrIn8 (2005)
Heffner, R. H., Morris, G. D., Bauer, E. D., Sarrao, J. L., Thompson, J. D., MacLaughlin, D. E., ...
We report muon spin rotation Knight shift and susceptibility studies for 1 T applied field along the crystalline c- and a-axes of the heavy fermion compound Ce2IrIn8. Below a characteristic...
Penetration depth, symmetry breaking, and gap nodes in superconducting PrOs4Sb12 (2005)
Shu, Lei, MacLaughlin, D. E., Heffner, R. H., Morris, G. D., Bernal, O. O., Callaghan, F., ...
Transverse-field muon spin relaxation rates in single crystals of the heavy-fermion superconductor PrOs4Sb12 (Tc = 1.85 K) are nearly constant in the vortex state for temperatures below ~0.5Tc. This...
The symmetry of the superconducting order parameter in PuCoGa$_5$ (2005)
Morris, G. D, Heffner, R. H., Bauer, E. D., Morales, L. A., Sarrao, J. S., Fluss, M. J., ...
The symmetry of the superconducting order parameter in single-crystalline PuCoGa$_5$ ($T_{\rm c} = 18.5$ K) is investigated via zero- and transverse- field muon spin relaxation ($\mu$SR)...
Darling, T. W., Lee, J. K., Proffen, Th., Heffner, R. H., Park, J. S., ...
Using neutron pair distribution function (PDF) analysis over the temperature range from 1000 K to 15 K, we demonstrate the existence of local polarization and the formation of medium-range, polar...
Local Distortion Induced Metal-to-Insulator Phase Transition in PrRu$_4$P$_{12}$ (2004)
Cao, D., Heffner, R. H., Bridges, F., Bauer, E. D., Yuhasz, W. M., ...
Extended X-ray Absorption Fine Structure (EXAFS) experiments have been carried out on PrRu$_4$P$_{12}$ and PrOs$_4$P$_{12}$ to study the metal-to-insulator (MI) phase transition in PrRu$_4$P$_{12}$....
Disorder, inhomogeneity and spin dynamics in f-electron non-Fermi liquid systems (2004)
MacLaughlin, D. E., Heffner, R. H., Bernal, O. O., Ishida, K., Sonier, J. E., Nieuwenhuys, G. J., ...
Muon spin rotation and relaxation ($\mu$SR) experiments have yielded evidence that structural disorder is an important factor in many f-electron-based non-Fermi-liquid (NFL) systems. Disorder-driven...
Low-temperature magnetic order and spin dynamics in YbRh2Si2 (2003)
Ishida,K., MacLaughlin,D. E., Young,B. L., Okamoto,K., Kawasaki,Y., Kitaoka,Y., ...
Darling, T. W., Graf, M. J., Proffen, Th., Heffner, R. H., Lee, Yongjae, ...
The temperature and pressure dependence of the thermal displacements and lattice parameters were obtained across the $\gamma \to \alpha$ phase transition of Ce using high-pressure, high-resolution...
Spin dynamics in a structurally ordered non-Fermi-liquid compound: YbRh2Si2 (2003)
Ishida,K., MacLaughlin,D. E., Bernal,O. O., Heffner,R. H., Nieuwenhuys,G. J., Trovarelli,O., ...
Magnetism and superconductivity in CeRh_{1-x}Ir_xIn_5 heavy fermion materials (2003)
Morris, G. D., Heffner, R. H., Sonier, J. E., MacLaughlin, D. E., Bernal, O. O., Nieuwenhuys, G. J., ...
We report on zero-field muon spin relaxation studies of cerium based heavy-fermion materials CeRh_{1-x}Ir_xIn_5. In the superconducting x=0.75 and 1 compositions muon spin relaxation functions were...
Spin dynamics in a structurally ordered non-Fermi-liquid compound: YbRh2Si2 (2003)
Ishida, K., MacLaughlin, D. E., Bernal, O. O., Heffner, R. H., Nieuwenhuys, G. J., Trovarelli, O., ...
Low-temperature magnetic order and spin dynamics in YbRh2Si2 (2003)
Ishida, K., MacLaughlin, D. E., Young, B. L., Okamoto, K., Kawasaki, Y., Kitaoka, Y., ...
Lattice dynamics and correlated atomic motion from the atomic pair distribution function (2002)
Heffner, R. H., Graf, M. J., Billinge, S. J. L.
The mean-square relative displacements (MSRD) of atomic pair motions in crystals are studied as a function of pair distance and temperature using the atomic pair distribution function (PDF). The...
Limits on phonon information extracted from neutron pair-density functions (2002)
Graf, Matthias J., Jeong, Il-Kyoung, Starr, Daniel L., Heffner, R. H.
We explore the possibility of extracting information about lattice dynamics in simple crystal structures from the neutron pair-density function (PDF) through inverse data analysis. Contrary to the...
muSR and NMR in f-electron non-Fermi liquid materials (2002)
MacLaughlin, D. E., Rose, M. S., Young, Ben-Li, Bernal, O. O., Heffner, R. H., Morris, G. D., ...
Magnetic resonance (muSR and NMR) studies of f-electron non-Fermi-liquid (NFL) materials give clear evidence that structural disorder is a major factor in NFL behavior. Longitudinal-field muSR...
muSR in Ce_{1-x}La_xAl_3: anisotropic Kondo effect? (2002)
MacLaughlin, D. E., Rose, M. S., Bernal, O. O., Heffner, R. H., Nieuwenhuys, G. J., ...
Zero-field muSR experiments in the heavy-fermion alloys Ce_{1-x}La_xAl_3, x = 0 and 0.2, examine a recent proposal that the system exhibits a strong anisotropic Kondo effect. We resolve a damped...
Spin dynamics in a structurally ordered non-Fermi liquid compound: YbRh_2Si_2 (2002)
Ishida, K., MacLaughlin, D. E., Bernal, O. O., Heffner, R. H., Nieuwenhuys, G. J., Trovarelli, O., ...
Muon spin relaxation (muSR) experiments have been carried out at low temperatures in the non-Fermi-liquid heavy-fermion compound YbRh_2Si_2. The longitudinal-field muSR relaxation function is...
muSR linewidth and isotropic pairing in superconducting PrOs4Sb12 (2002)
MacLaughlin, D. E., Sonier, J. E., Heffner, R. H., Bernal, O. O., Rose, M. S., ...
Transverse-field muon spin rotation measurements in the vortex-lattice mixed state of the heavy-fermion (HF) superconductor PrOs4Sb12 yield a temperature dependence of the penetration depth...
Susceptibility Inhomogeneity and Non-Fermi-Liquid Behavior in Ce(Ru_{0.5}Rh_{0.5})_2Si_2 (2001)
MacLaughlin, D. E., Bernal, O. O., Sonier, J. E., Heffner, R. H., Taniguchi, T., Miyako, Y.
Magnetic susceptibility and muon spin rotation (\muSR) experiments have been carried out to study the effect of structural disorder on the non-Fermi-liquid (NFL) behavior of the heavy-fermion alloy...
Slow Spin Dynamics in Non-Fermi-Liquid UCu_{5-x}Pd_x, x = 1.0 and 1.5 (2001)
MacLaughlin, D. E., Heffner, R. H., Bernal, O. O., Nieuwenhuys, G. J., Sonier, J. E., Rose, M. S., ...
Low-temperature muon spin-lattice relaxation measurements in the non-Fermi-liquid heavy-fermion alloys UCu_{5-x}Pd_x, x = 1.0 and 1.5, indicate inhomogeneously distributed f-electron spin fluctuation...
Sonier, J. E., Brewer, J. H., Kiefl, R. F., Heffner, R. H., Poon, K., Stubbs, S. L., ...
Zero-field muon spin relaxation (ZF-$\mu$SR) measurements were undertaken on under- and overdoped samples of superconducting YBa$_2$Cu$_3$O$_{6+x}$ to determine the origin of the weak static...
Argyriou, D. N., Brown, P. J., Gardner, J. S., Heffner, R. H.
In the ferromagnetic metallic state of the colossal magnetoresistive (CMR) manganite La1.2Sr1.8Mn2O7, the spin density distribution is essentially in agreement with the standard picture in which the...
Heffner, R. H., MacLaughlin, D. E., Sonier, J. E., Nieuwenhuys, G. J., Bernal, O. O., Simovic, Barbara, ...
This paper has been withdrawn by the authors. We performed additional zero-field muon spin relaxation measurements in the superconducting state of CeIrIn$_5$ and found that the spontaneous fields...
Glassy Spin Dynamics in Non-Fermi-Liquid UCu5xPdx, x = 1.0 and 1.5 (2001)
Bernal, O. O., Heffner, R. H., MacLaughlin, D. E., Nieuwenhuys, G. J., Rose, M. S.
Glassy Spin Dynamics in Non-Fermi-Liquid UCu_{5-x}Pd_x, x = 1.0 and 1.5 (2000)
MacLaughlin, D. E., Bernal, O. O., Heffner, R. H., Nieuwenhuys, G. J., Rose, M. S., Sonier, J. E., ...
Local f-electron spin dynamics in the non-Fermi-liquid heavy-fermion alloys UCu_{5-x}Pd_x, x = 1.0 and 1.5, have been studied using muon spin-lattice relaxation. The sample-averaged asymmetry...
Local lattice disorder in the geometrically-frustrated spin glass pyrochlore Y2Mo2O7 (2000)
Booth, C. H., Gardner, J. S., Kwei, G. H., Heffner, R. H., Bridges, F., Subramanian, M. A.
The geometrically-frustrated spin glass Y2Mo2O7 has been considered widely to be crystallographically ordered with a unique nearest neighbor magnetic exchange interaction, J. To test this assertion,...
Positive Muon Knight Shift Measurements in U_{0.965}Th_{0.035}Be_{13} Single Crystals (2000)
Sonier, J. E., Heffner, R. H., MacLaughlin, D. E., Nieuwenhuys, G. J., Bernal, O., Movshovich, R., ...
Muon spin rotation measurements of the temperature dependence of the Knight shift in single crystals of U_{0.965}Th_{0.035}Be_{13} have been used to study the static spin susceptibility below the...
Observation of two time scales in the ferromagnetic manganite La(1-x)Ca(x)MnO(3), x = 0.3 (1999)
Heffner, R. H., Sonier, J. E., MacLaughlin, D. E., Nieuwenhuys, G. J., Ehlers, G., Mezei, F., ...
We report new zero-field muon spin relaxation and neutron spin echo measurements in ferromagnetic (FM) (La,Ca)MnO3 which taken together suggest two spatially separated regions in close proximity...
Field Induced Reduction of the Low Temperature Superfluid Density in YBa2Cu3O6.95 (1999)
Sonier, J. E., Brewer, J. H., Kiefl, R. F., Morris, G. D., Miller, R. I., Bonn, D. A., ...
A novel high magnetic field (8 T) spectrometer for muon spin rotation has been used to measure the temperature dependence of the in-plane magnetic penetration depth in YBa2Cu3O6.95. At low H and low...
Pd/Cu Site Interchange and Non-Fermi-Liquid Behavior in UCu_4Pd (1998)
Booth, C. H., MacLaughlin, D. E., Heffner, R. H., Chau, R., Maple, M. B, Kwei, G. H.
X-ray-absorption fine-structure measurements of the local structure in UCu_4Pd are described which indicate a probable lattice-disorder origin for non-Fermi-liquid behavior in this material. Short...
Muon Spin Relaxation and Nonmagnetic Kondo State in PrInAg_2 (1998)
MacLaughlin, D. E., Heffner, R. H., Nieuwenhuys, G. J., Canfield, P. C., Amato, A., Baines, C., ...
Muon spin relaxation experiments have been carried out in the Kondo compound PrInAg_2. The zero-field muon relaxation rate is found to be independent of temperature between 0.1 and 10 K, which rules...
Susceptibility inhomogeneity and non-Fermi liquid behavior in nominally ordered UCu_4Pd (1998)
MacLaughlin, D. E., Heffner, R. H., Nieuwenhuys, G. J., Luke, G. M., Fudamoto, Y., Uemura, Y. J., ...
Muon spin rotation experiments on a stoichiometric sample of the non-Fermi liquid (NFL) heavy-fermion compound UCu_4Pd, in which recent neutron Bragg scattering measurements are consistent with an...
mu +SR in the random bond spin glass URh2Ge2 (1998)
Menovsky, A.A., Nieuwenhuys, G.J., Sullow, S., Mydosh, J.A., Heffner, R.H., Le, L.P., ...
μ+SR in the random bond spin glass URh2Ge2 (1998)
Nieuwenhuys,G. J., Suellow,S., Menovsky,A. A., Mydosh,J. A., Heffner,R. H., Le,L. P., ...
μ+SR in the random bond spin glass URh2Ge2 (1998)
Nieuwenhuys, G. J., Suellow, S., Menovsky, A. A., Mydosh, J. A., Heffner, R. H., Le, L. P., ...
Competition between magnetism and superconductivity in CeCu2Si2 (1997)
Feyerherm,R., Amato,A., Geibel,C., Gygax,F. N., Hellmann,P., Heffner,R. H., ...