S. J. Blundell

Heat capacity measurements on FeAs-based compounds: a thermodynamic probe of electronic and magnetic states (2008)

Baker, P. J., Giblin, S. R., Pratt, F. L., Liu, R. H., Wu, G., Chen, X. H., ...

We report heat capacity measurements of the pnictide materials SmFeAsO$_{1-x}$F$_x$, NdFeAsO, LaFeAsO$_{1-x}$F$_x$ and LiFeAs. For SmFeAsO$_{1-x}$F$_x$, with x close to 0.1, we use 3 He measurements...

Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO1-xFx measured by muon spin rotation (2008)

Drew, Alan J., Pratt, F. L., Lancaster, T., Blundell, S. J., Baker, P. J., Liu, R. H., ...

Muon spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO1-xFx with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations in the...

Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO1-xFx measured by muon spin rotation (2008)

Drew, Alan J., Pratt, F. L., Lancaster, T., Blundell, S. J., Baker, P. J., Liu, R. H., ...

Muon spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO1-xFx with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations in the...

Enhancement of Superfluid Stiffness, Suppression of Superconducting T_c and Field-induced Magnetism in the Pnictide Superconductor LiFeAs (2008)

Pratt, F. L., Baker, P. J., Blundell, S. J., Lancaster, T., Lewtas, H. J., Adamson, P., ...

Transverse-field muon-spin rotation measurements performed on two samples of LiFeAs demonstrate that the superfluid stiffness of the superconducting condensate in relation to its superconducting...

Effect of magnesium doping on the orbital and magnetic order in LiNiO2 (2008)

Bonda, M., Hopzapfel, M., De Brion, Sophie, Darie, Céline, Feher, T., Baker, P.J., ...

In LiNiO2, the Ni3+ ions, with S=1/2 and twofold orbital degeneracy, are arranged on a trian- gular lattice. Using muon spin relaxation (MuSR) and electron spin resonance (ESR), we show that...

Effect of magnesium doping on the orbital and magnetic order in LiNiO2 (2008)

Bonda, M., Hopzapfel, M., De Brion, Sophie, Darie, Céline, Feher, T., Baker, P.J., ...

In LiNiO2, the Ni3+ ions, with S=1/2 and twofold orbital degeneracy, are arranged on a trian- gular lattice. Using muon spin relaxation (MuSR) and electron spin resonance (ESR), we show that...

Determination of characteristic muon precession and relaxation signals in FeAs and FeAs2, possible impurity phases in pnictide superconductors (2008)

Baker, P. J., Lewtas, H. J., Blundell, S. J., Lancaster, T., Pratt, F. L., Parker, D. R., ...

We report muon-spin relaxation measurements of highly homogeneous samples of FeAs and FeAs2, both previously found as impurity phases in some samples of recently synthesized pnictide superconductors....

Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation (2008)

Drew, A. J., Niedermayer, Ch., Baker, P. J., Pratt, F. L., Blundell, S. J., Lancaster, T., ...

The recent observation of superconductivity with critical temperatures up to 55 K in the FeAs based pnictide compounds marks the first discovery of a non copper-oxide based layered high-Tc...

Effect of magnesium doping on the orbital and magnetic order in LiNiO2 (2008)

Bonda, M., Hopzapfel, M., De Brion, Sophie, Darie, Céline, Feher, T., Baker, P. J., ...

In LiNiO2, the Ni3+ ions, with S=1/2 and twofold orbital degeneracy, are arranged on a trian- gular lattice. Using muon spin relaxation (MuSR) and electron spin resonance (ESR), we show that...

Isotope effect in quasi-two-dimensional metal-organic antiferromagnets (2008)

Goddard, P. A., Singleton, J., Maitland, C., Blundell, S. J., Lancaster, T., Baker, P. J., ...

Although the isotope effect in superconducting materials is well-documented, changes in the magnetic properties of antiferromagnets due to isotopic substitution are seldom discussed and remain poorly...

Tuning the interlayer spacing in high T_c superconductors: penetration depth and two-dimensional superfluid density (2008)

Baker, P. J., Lancaster, T., Blundell, S. J., Pratt, F. L., Brooks, M. L.

Substantial control of the interlayer spacing in Bi-based high temperature superconductors has been achieved through the intercalation of guest molecules between the superconducting layers....

Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO$_{1-x}$F$_{x}$ measured by muon spin rotation (2008)

Drew, A. J., Pratt, F. L., Lancaster, T., Blundell, S. J., Baker, P. J., Liu, R. H., ...

Muon-spin rotation experiments were performed on the pnictide high temperature superconductor SmFeAsO$_{1-x}$F$_{x}$ with x=0.18 and 0.3. We observed an unusual enhancement of slow spin fluctuations...

Muon spin relaxation study of LaTiO3 and YTiO3 (2008)

Baker, P. J., Lancaster, T., Blundell, S. J., Hayes, W., Pratt, F. L., Itoh, M., ...

We report muon spin relaxation measurements on two Ti3+ containing perovskites, LaTiO3 and YTiO3, which display long range magnetic order at low temperature. For both materials, oscillations in the...

Exchange parameters of copper-based quasi-two-dimensional Heisenberg magnets measured using high magnetic fields and muon-spin rotation (2008)

Goddard, P. A., Singleton, J., Sengupta, P., McDonald, R. D., Lancaster, T., Blundell, S. J., ...

Pulsed-field magnetization experiments (fields $B$ of up to 85 T and temperatures $T$ down to 0.4 K) are reported on nine organic Cu-based two-dimensional (2D) Heisenberg magnets. All compounds show...

Anomalous temperature evolution of the internal magnetic field distribution in the charge-ordered triangular antiferromagnet AgNiO2 (2007)

Lancaster, T., Blundell, S. J., Baker, P. J., Brooks, M. L., Hayes, W., Pratt, F. L., ...

Zero-field muon-spin relaxation measurements of the frustrated triangular quantum magnet AgNiO2 are consistent with a model of charge disproportionation that has been advanced to explain the...

Muon-fluorine entangled states in molecular magnets (2007)

Lancaster, T., Blundell, S. J., Baker, P. J., Brooks, M. L., Hayes, W., Pratt, F. L., ...

The information accessible from a muon-spin relaxation experiment is often limited since we lack knowledge of the precise muon stopping site. We demonstrate here the possibility of localizing a spin...

A muon-spin relaxation study of BiMnO3 (2007)

Lancaster, T., Blundell, S. J., Baker, P. J., Pratt, F. L., Hayes, W., Yamada, I., ...

We present the results of muon-spin relaxation measurements on ferromagnetic BiMnO3. Below T_C=98.0(1) K oscillations in the time-dependence of the muon polarization are observed, characteristic of a...

Magnetism in the high-Tc analogue Cs2AgF4 studied with muon-spin relaxation (2007)

Lancaster, T., Blundell, S. J., Baker, P. J., Hayes, W., Giblin, S. R., McLain, S. E., ...

We present the results of a muon-spin relaxation study of the high-Tc analogue material Cs2AgF4. We find unambiguous evidence for magnetic order, intrinsic to the material, below T_C=13.95(3) K. The...

Angle-dependent magnetoresistance oscillations due to magnetic breakdown orbits (2007)

Bangura, A. F., Goddard, P. A., Singleton, J., Tozer, S. W., Coldea, A. I., Ardavan, A., ...

We present experimental evidence for a hitherto unconfirmed type of angle-dependent magnetoresistance oscillation caused by magnetic breakdown. The effect was observed in the organic superconductor...

Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz)_2(ClO_4)_2 (2006)

Lancaster, T., Blundell, S. J., Brooks, M. L., Baker, P. J., Pratt, F. L., Manson, J. L., ...

We present an investigation of magnetic ordering in the two-dimensional S=1/2 quantum magnet Cu(Pz)_2(ClO_4)_2 using specific heat and zero field muon-spin relaxation (\mu^+SR). The magnetic...

Separation of energy scales in the kagome antiferromagnet TmAgGe: a magnetic-field-orientation study up to 55 T (2006)

Goddard, P. A., Singleton, J., Lima-Sharma, A. L., Morosan, E., Blundell, S. J., Bud'ko, S. L., ...

TmAgGe is an antiferromagnet in which the spins are confined to distorted kagome-like planes at low temperatures. We report angle-dependent measurements of the magnetization $M$ in fields of up to 55...

Magnetism in Geometrically Frustrated YMnO3 Under Hydrostatic Pressure Studied with Implanted Muons (2006)

Lancaster, T., Blundell, S. J., Andreica, D., Janoschek, M., Roessli, B., Gvasaliya, S. N., ...

The rare-earth ferroelectromagnet YMnO3 consists of weakly coupled triangular layers of S=2 spins. Below T_N ~ 70 K muon-spin relaxation data show two oscillatory relaxing signals due to magnetic...

The kagome staircase compounds Ni$_{3}$V$_{2}$O$_{8}$ and Co$_{3}$V$_{2}$O$_{8}$ studied with implanted muons (2006)

Lancaster, T., Blundell, S. J., Baker, P. J., Prabhakaran, D., Hayes, W., Pratt, F. L.

We present the results of muon-spin relaxation ($\mu^{+}$SR) measurements on the kagome staircase compounds Ni$_{3}$V$_{2}$O$_{8}$ and Co$_{3}$V$_{2}$O$_{8}$. The magnetic behavior of these materials...

Muon-spin relaxation measurements on the dimerized spin-1/2 chains NaTiSi2O6 and TiOCl (2006)

Baker, P. J., Blundell, S. J., Pratt, F. L., Lancaster, T., Brooks, M. L., Hayes, W., ...

We report muon spin relaxation (muSR) and magnetic susceptibility investigations of two Ti3+ chain compounds which each exhibit a spin gap at low temperature, NaTiSi2O6 and TiOCl. From these we...

10th International Conference on Muon Spin Rotation, Relaxation and Resonance (2006)

Blundell, S J, King, P J C, Pratt, F L

Effect of irradiation-induced disorder on the conductivity and critical temperature of the organic superconductor kappa-(BEDT-TTF)(2)Cu(SCN)(2) (2006)

Analytis, J. G., Ardavan, A., Blundell, S. J., Owen, R. L., Garman, E. F., Jeynes, C., ...

We have introduced defects into clean samples of the organic superconductor kappa-(BEDT- TTF)(2)Cu(SCN)(2) in order to determine their effect on the temperature dependence of the interlayer...

Magnetic order in the quasi-one-dimensional spin 1/2 chain, copper pyrazine dinitrate (2005)

Lancaster, T., Blundell, S. J., Brooks, M. L., Baker, P. J., Pratt, F. L., Manson, J. L., ...

We present the first evidence of magnetic order in the quasi-one-dimensional spin 1/2 molecular chain compound, copper pyrazine dinitrate Cu(C4H4N2)(NO3)2}. Zero field muon-spin relaxation...

Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2 (2005)

Baker, P. J., Lancaster, T., Blundell, S. J., Brooks, M. L., Hayes, W., Prabhakaran, D., ...

We report muon-spin rotation, heat capacity, magnetization, and ac magnetic susceptibility measurements of the layered spin-1/2 antiferromagnet NaNiO2. These show the onset of long-range magnetic...

Magnetism in the S=1 frustrated antiferromagnet GeNi2O4 studied using implanted muons (2005)

Lancaster, T., Blundell, S. J., Prabhakaran, D., Baker, P. J., Hayes, W., Pratt, F. L.

We present the results of a muon-spin relaxation study of GeNi2O4. We provide further clarification of the two transitions to the antiferromagnetic state and measure the magnetic field dependence of...

Unconventional magnetic properties of the weakly ferromagnetic metal BaIrO_3 (2005)

Brooks, M. L., Blundell, S. J., Lancaster, T., Hayes, W., Pratt, F. L., Frampton, P. P. C., ...

We present experimental evidence for small-moment magnetism below the ferromagnetic transition temperature (T_c3 = 183 K) in the quasi-one-dimensional metal BaIrO_3. Further, we identify...

Ca2.5Sr0.5GaMn2O8: diamagnetic Ga in control of the structural and electronic properties of a bilayered manganate (2004)

Battle, P D, Blundell, S J, Brooks, M L, Hervieu, M, Kapusta, C, Lancaster, T, ...

Muon-spin-rotation and magnetization study of metal-organic magnets based on the dicyanamide anion (2001)

Jestadt, T, Kurmoo, M, Blundell, S J, Pratt, F L, Kepert, C J, Prassides, K, ...

muSR studies of the flux vortex phases in a BEDT-TTF superconductor (2001)

Pratt, F L, Lee, S L, Aegerter, CM, Lloyd, SH, Blundell, S J, Ogrin, FY, ...

Stability of the vortex lattice in ET superconductors studied by muSR (1999)

Blundell, S J, Lee, S L, Pratt, F L, Aegerter, CM, Jestadt, Th, Lovett, BW, ...

Angular-dependent muon-spin rotation on the mixed state of the organic superconductor K-(BEDT-TTF)(2)CU(SCN)(2) (1998)

Ager, C, Lee, S L, Aegerter, CM, Pratt, F L, Blundell, S J, Lloyd, SH, ...

Muon spin rotation studies of the vortex lattice in kappa-(ET)2Cu(NCS)2 (1997)

Lee, S L, Blundell, S J, Pratt, F L, Pattenden, PA, Forgan, E M, Sasaki, T, ...

Investigation of vortex behaviour in the organic superconductor kappa-(BEDT-TTF)2Cu(SCN)2 using muon spin rotation (1997)

Lee, S L, Pratt, F L, Blundell, S J, Aegerter, CM, Pattenden, PA, Chow, KH, ...

Mu+SR of the organic ferromagnet p-NPNN - diamagnetic and paramagnetic states (1995)

Blundell, S J, Pattenden, P A, Pratt, F L, Valladares, R M, Sugano, T, Hayes, W