The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4 (2008)
Lipscombe, O. J., Vignolle, B., Perring, T. G., Frost, C. D., Hayden, S. M.
We use inelastic neutron scattering to measure the magnetic excitations in the underdoped superconductor La2-xSrxCuO4 (x=0.085, Tc=22 K) over energy and temperatures ranges 5 < E < 200 meV and 5 < T...
Lipscombe, O. J., Hayden, S. M., Vignolle, B., McMorrow, D. F., Perring, T. G.
We report a detailed inelastic neutron scattering study of the collective magnetic excitations of overdoped superconducting La1.78Sr0.22CuO4 for the energy range 0-160 meV. Our measurements show that...
Dispersive excitations in the high-temperature superconductor La2-xSrxCuO4 (2007)
Christensen, N. B., McMorrow, D. F., Ronnow, H. M., Lake, B., Hayden, S. M., Aeppli, G., ...
High-resolution neutron scattering experiments on optimally doped La2-xSrxCuO4 (x=0.16) reveal that the magnetic excitations are dispersive. The dispersion is the same as in YBa2Cu3O6.85, and is...
Vignolle, B., Hayden, S. M., McMorrow, D. F., Ronnow, H. M., Lake, B., Frost, C. D., ...
The excitations responsible for producing high-temperature superconductivity in the cuprates have not been identified. Two promising candidates are collective spin excitations and phonons. A recent...
Woo, Hyungje, Dai, Pengcheng, Hayden, S. M., Mook, H. A., Dahm, T., Scalapino, D. J., ...
Understanding the magnetic excitations in high-transition temperature (high-$T_c$) copper oxides is important because they may mediate the electron pairing for superconductivity. By determining the...
Ferromagnetic Properties of ZrZn$_2$ (2005)
Yelland, E. A., Yates, S. J. C., Taylor, O., Griffiths, A., Hayden, S. M., Carrington, A.
The low Curie temperature (T_C approx 28K) and small ordered moment (M_0 approx 0.17 mu_B f.u.^-1) of ZrZn2 make it one of the few examples of a weak itinerant ferromagnet. We report results of...
Superconductivity induced by spark erosion in ZrZn2 (2005)
Yelland, E. A., Hayden, S. M., Yates, S. J. C., Pfleiderer, C., Uhlarz, M., Vollmer, R., ...
We show that the superconductivity observed recently in the weak itinerant ferromagnet ZrZn2 [C. Pfleiderer et al., Nature (London) 412, 58 (2001)] is due to remnants of a superconducting layer...
Quantum Phase Transitions in the Itinerant Ferromagnet ZrZn$_2$ (2004)
Uhlarz, M., Pfleiderer, C., Hayden, S. M.
We report a study of the ferromagnetism of ZrZn$_{2}$, the most promising material to exhibit ferromagnetic quantum criticality, at low temperatures $T$ as function of pressure $p$. We find that the...
Universal Dispersive Excitations in the High-Temperature Superconductors (2004)
Christensen, N. B., McMorrow, D. F., Ronnow, H. M., Lake, B., Hayden, S. M., Aeppli, G., ...
High-resolution neutron scattering experiments on optimally doped La$_{2-x}$Sr$_x$CuO$_4$ have been performed which reveal that the magnetic excitations are dispersive. The dispersion is found to be...
Polarized Neutron Measurement of Magnetic Order in YBa2Cu3O6.45 (2004)
Mook, H. A., Dai, Pengcheng, Hayden, S. M., Hiess, A., Dogan, F.
Orbital current order of the d-density-wave type (DDW) has been postulated to explain the pseudogap in the high temperature superconductors. We have performed neutron scattering experiments to search...
Hayden, S M, Mook, H A, Dai, P, Perring, T G, Dogan, F
In conventional superconductors, lattice vibrations (phonons) mediate the attraction between electrons that is responsible for superconductivity. The high transition temperatures (high-Tc) of the...
Dispersive excitations in the high-temperature superconductor La2-xSrxCuO4 (2004)
Christensen, N B, McMorrow, D F, Ronnow, H M, Lake, B, Hayden, S M, Aeppli, G, ...
Major, Z, Dugdale, SB, Watts, RJ, Santi, G, Alam, MA, Hayden, S M, ...
Multiband superconductivity in NbSe_2 from heat transport (2003)
Boaknin, Etienne, Tanatar, M. A., Paglione, Johnpierre, Hawthorn, D. G., Hill, R. W., Ronning, F., ...
The thermal conductivity of the layered s-wave superconductor NbSe_2 was measured down to T_c/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized...
Capogna, L., Forgan, E. M., Hayden, S. M., Wildes, A., Duffy, J. A., Mackenzie, A. P., ...
We report an observation of two-dimensional incommensurate magnetic fluctuations in the layered metallic perovskite Sr3Ru2O7. The wave vectors where the magnetic fluctuations are strongest are...
Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity (2002)
Boaknin, Etienne, Tanatar, M. A., Paglione, Johnpierre, Hawthorn, D., Ronning, F., Hill, R. W., ...
The thermal conductivity kappa of the layered s-wave superconductor NbSe_2 was measured down to T_c/100 throughout the vortex state. With increasing field, we identify two regimes: one with localized...
Heavy quasiparticles in the ferromagnetic superconductor ZrZn2 (2002)
Yates, S. J. C., Santi, G., Hayden, S. M., Meeson, P. J., Dugdale, S. B.
We report a study of the de Haas-van Alphen effect in the normal state of the ferromagnetic superconductor ZrZn2. Our results are generally consistent with an LMTO band structure calculation which...
Magnetic Order in YBa$_2$Cu$_3$O$_{6+x}$ Superconductors (2002)
Mook, H. A., Dai, Pengcheng, Hayden, S. M., Hiess, A., Lynn, J. W., ...
Polarized and unpolarized neutron diffraction has been used to search for magnetic order in YBa$_2$Cu$_3$O$_{6+x}$ superconductors. Most of the measurements were made on a high quality crystal of...
Capogna, L., Forgan, E. M., Hayden, S. M., Wildes, A., Duffy, J. A., Mackenzie, A. P., ...
We report the first observation of two-dimensional incommensurate magnetic fluctuations in the layered metallic perovskite Sr3Ru2O7. The wavevectors where the magnetic fluctuations are strongest are...
Metamagnetic transition and low-energy spin density fluctuations in Sr3Ru2O7 (2002)
Capogna, L., Forgan, E. M., Hayden, S. M., McIntyre, G., Wildes, A., Mackenzie, A. P., ...
Clayton, N. J., Ito, H., Hayden, S. M., Meeson, P. J., Springford, M., Saito, G.
We report measurements of the de Haas-van Alphen (DHVA) effect and AC susceptibility in the layered organic superconductor $\kappa$-(BEDT-TTF)$_{2}$Cu(NCS)$_{2}$. The amplitude of the DHVA...
Spin waves and electronic interactions in La2CuO4 (2001)
Coldea, R, Hayden, S M, Aeppli, G, Perring, T G, Frost, C D, Mason, T E, ...
A polarized neutron-scattering study of the Cooper-pair moment in Sr2RuO4 (2000)
Duffy, J. A., Hayden, S. M., Maeno, Y., Mao, Z., Kulda, J., McIntyre, G. J.
We report a study of the magnetization density in the mixed state of the unconventional superconductor S2RuO4. On entering the superconducting state we find no change in the magnitude or distribution...
Dai, Pengcheng, Mook, H. A., Aeppli, G., Hayden, S. M., Dogan, F.
One of the most striking universal properties of the high-transition-temperature (high-$T_c$) superconductors is that they are all derived from the hole-doping of their insulating antiferromagnetic...
Spin waves and electronic interactions in La2CuO4 (2000)
Coldea, R., Hayden, S. M., Aeppli, G., Perring, T. G., Frost, C. D., Mason, T. E., ...
The magnetic excitations of the square-lattice spin-1/2 antiferromagnet and high-Tc parent La2CuO4 are determined using high-resolution inelastic neutron scattering. Sharp spin waves with absolute...
The Magnetic Excitation Spectrum and Thermodynamics of High-$T_c$ Superconductors (2000)
Dai, Pengcheng, Mook, H. A., Hayden, S. M., Aeppli, G., Perring, T. G., Hunt, R. D., ...
Inelastic neutron scattering was used to study the wavevector- and frequency-dependent magnetic fluctuations in single crystals of superconducting YBa$_2$Cu$_3$O$_{6+x}$. The spectra contain several...
Spin excitations and exchange couplings in the cuprate antiferromagnet La2CuO4 (2000)
Coldea, R, Hayden, S M, Aeppli, G, Perring, T G, Frost, C D, Mason, T E, ...
Hayden, S. M., Doubble, R., Aeppli, G., Perring, T. G., Fawcett, E.
Inelastic neutron scattering reveals strong spin fluctuations with energies as high as 0.4eV in the nearly antiferromagnetic metal Cr$_{0.95}$V$_{0.05}$. The magnetic response is well described by a...
Spin gap and magnetic coherence in a clean high-T_c superconductor (1999)
Lake, B., Aeppli, G., Mason, T. E., Schroder, A., McMorrow, D. F., Lefmann, K., ...
A notable aspect of high-temperature superconductivity in the copper oxides is the unconventional nature of the underlying paired-electron state. A direct manifestation of the unconventional state is...
The magnetic excitation spectrum and thermodynamics of high-Tc superconductors (1999)
Dai, P, Mook, H A, Hayden, S M, Aeppli, G, Perring, T G, Hunt, R D, ...
The weights of various features in the magnetic spectra of cuprates (1999)
Aeppli, G, Hayden, S M, Dai, P, Mook, H A, Hunt, R D, Perring, T G, ...
Neutron scattering and the search for mechanisms of superconductivity (1999)
Aeppli, G, Bishop, DJ, Broholm, C, Dai, P, Hayden, S M, Perring, T G, ...
Aeppli, G., Mason, T. E., Hayden, S. M., Mook, H. A., Kulda, J.
Polarized and unpolarized neutron scattering was used to measure the wave vector- and frequency-dependent magnetic fluctuations in the normal state (from the superconducting transition temperature,...
Absolute measurements of the high-frequency magnetic dynamics in high-Tc superconductors (1998)
Hayden, S M, Aeppli, G, Dai, P, Mook, H A, Perring, T G, Cheong, S-W, ...
Magnetic dynamics in colossal magnetoresistive perovskite manganites (1998)
Perring, T G, Aeppli, G, Hayden, S M, Tokura, Y, Moritomo, Y, Remeika, J P, ...
Spin fluctuations in YBa2Cu3O6.6 (1998)
Mook, H A, Dai, P, Hayden, S M, Aeppli, G, Perring, T G, Dogan, F
Absolute measurements of the high-frequency magnetic dynamics in high-Tc superconductors (1997)
Hayden, S. M., Aeppli, G., Dai, P., Mook, H. A., Perring, T. G., ...
We review recent measurements of the high-frequency dynamic magnetic susceptibility in the high-$T_c$ superconducting systems La$_{2-x}$Sr$_{x}$CuO$_4$ and YBa$_2$Cu$_3$O$_{6+x}$. Experiments were...
Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites (1997)
Perring, T G, Aeppli, G, Hayden, S M, Moritomo, Y, Tokura, Y, Remeika, J P, ...
High frequency magnetic excitations in Cr0.95V0.05 (1997)
Hayden, S M, Doubble, R, Aeppli, G, Perring, T G, Fawcett, E, Lowden, J R, ...
Magnetic coherence in the transition metal oxides (1997)
Aeppli, G, Broholm, C, DiTusa, J F, Hayden, S M, Ito, T, Lee, S H, ...
Hayden, S. M., Aeppli, G., Mook, H. A., Perring, T. G., Mason, T. E., Cheong, S-W., ...
Inelastic neutron scattering performed at a spallation source is used to make absolute measurements of the dynamic susceptibility of insulating La2CuO4 and superconducting La2-xSrxCuO4 over the...
New magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4} (1996)
Mason, T. E., Schroder, A., Aeppli, G., Mook, H. A., Hayden, S. M.
We have used inelastic neutron scattering to examine the magnetic fluctuations at intermediate frequencies in the simplest high temperature superconductor, La_{2-x}Sr_{x}Cu_{4}. The suppression of...
High-Frequency Spin Waves in YBa2Cu3O6.15 (1996)
Hayden, S. M., Aeppli, G., Perring, T. G., Mook, H. A., Dogan, F.
Pulsed neutron spectroscopy is used to make absolute measurements of the dynamic magnetic susceptibility of insulating YBa2Cu3O6.15. Acoustic and optical modes, derived from in- and out-of-phase...
Spin-waves throughout the Brillouin-zone of a double-exchange ferromagnet (1996)
Perring, T G, Aeppli, G, Hayden, S M, Carter, S A, Remeika, J P, Cheong, S W
High energy spin excitations of a high-Tc superconductor La1.85Sr0.15CuO4 (1996)
Arai, M, Arakawa, T, Fujita, M, Wakimoto, S, Yamada, K, Endoh, Y, ...
Magnetic correlations in doped transition-Metal oxides (1995)
Aeppli, G, Bao, W, Broholm, C, Cheong, S-W, Dai, P, Hayden, S M, ...
in 'Spectroscopy of Mott Insulators and Correlated Metals', Eds A Fujimori, Y Tokura. Springer Series in Solid-State Sciences Vol 119 (1995)
Neutron scattering and magnetic dynamics in insulators, metals and superconductors (1994)
Aeppli, G, Mook, H A, Mason, T E, Hayden, S M, Taylor, A D, Perring, T G, ...
Proc Int School of Physics Enrico Fermi, Eds R A Broglia, J R Schrieffer, P F Bortignon, Elsevier Science. Vol 121 Ch 3 p205 (1994)
de Haas-van Alphen effect in the vortex state of Nb3Sn (1994)
Harrison, N., Hayden, S.M., Meeson, P., Springford, M., Menovsky, A.A.
From insulator to metal with hot and cold neutrons (1993)
Aeppli, G, Hayden, S M, Mook, H A, Mason, T E, Taylor, A D, Clausen, K N, ...
Magnetic excitations in the intinerant antiferromagnet Mn90Cu10 (1992)
Fernandez-Baca, J A, Hagen, M E, Nicklow, R M, Tsunoda, Y, Hayden, S M