The role of f -electrons in the Fermi surface of the heavy fermion superconductor beta-YbAlB4 (2008)
O'Farrell, E. C. T., Tompsett, D. A., Sebastian, S. E., Harrison, N., Capan, C., Balicas, L., ...
We present a detailed quantum oscillation study of the Fermi surface of the recently discovered Yb-based heavy fermion superconductor beta-YbAlB4 . We compare the data, obtained at fields from 10 to...
Observation of a multiferroic critical end point (2008)
Kim, Jae Wook, Haam, S. Y., Oh, Y. S., Park, S., Sharma, P. A., ...
The study of abrupt increases in magnetization with magnetic field known as metamagnetic transitions has opened a rich vein of new physics in itinerant electron systems, including the discovery of...
Harrison, N., Sebastian, S. E.
We calculate the de Haas-van Alphen (dHvA) effect waveform using the canonical ensemble for different Fermi surface scenarios applicable to the underdoped cuprate superconductor YBa2Cu3O6.5, in which...
Sebastian, Suchitra E., Gillett, J., Harrison, N., Mielke, C. H., Goh, S. K., Lau, P. H. C., ...
Knowing the nature of elementary excitations in the undoped parent magnetic phase of high temperature superconductors is critical for understanding the origin of unconventional pairing1,2. This is...
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...
Fractalization drives crystalline states in a frustrated spin system (2007)
Sebastian, Suchitra E., Harrison, N., Sengupta, P., Batista, C. D., Francoual, S., Palm, E., ...
We measure a sequence of quantum Hall-like plateaux at 1/q: 9 >= q >= 2 and p/q = 2/9 fractions in the magnetisation with increasing magnetic field in the geometrically frustrated spin system...
Quantum Oscillations in the Underdoped Cuprate YBa2Cu4O8 (2007)
Yelland, E. A., Singleton, J., Mielke, C. H., Harrison, N., Balakirev, F. F., Dabrowski, B., ...
We report the observation of quantum oscillations in the underdoped cuprate superconductor YBa2Cu4O8 using a tunnel-diode oscillator technique in pulsed magnetic fields up to 85T. There is a clear...
Fermi surface of CeIn3 above the Neel critical field (2007)
Harrison, N., Sebastian, S. E., Mielke, C. H., Paris, A., Gordon, M. J., Swenson, C. A., ...
We report measurements of the de Haas-van Alphen effect in CeIn3 in magnetic fields extending to ~90 T, well above the Ne'el critical field of Hc ~61 T. The unreconstructed Fermi surface a-sheet is...
Quantum spin correlations in an organometallic alternating sign chain (2007)
Stone, M. B., Tian, W., Lumsden, M. D., Granroth, G. E., Mandrus, D., ...
High resolution inelastic neutron scattering is used to study excitations in the organometallic magnet DMACuCl$_3$. The correct magnetic Hamiltonian describing this material has been debated for many...
Vibrational analysis study of aluminum trifluoride phases (2007)
Gross, U, Rudiger, S, Kemnitz, E, Brzezinka, KW, Mukhopadhyay, S, Bailey, CL, ...
Field induced metastabilities in U(Ru0.96Rh0.04)2Si2 (2007)
Silhanek, A. V., Jaime, M., Harrison, N., Batista, C. D., Amitsuka, H., Nakatsuji, S., ...
Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet (2006)
Stone, M. B., Broholm, C., Reich, D. H., Schiffer, P., Tchernyshyov, O., Vorderwisch, P., ...
We report magnetic susceptibility, specific heat, and neutron scattering measurements as a function of applied magnetic field and temperature to characterize the $S=1/2$ quasi-two-dimensional...
Oh, Y. S., Kim, Kee Hoon, Sharma, P. A., Harrison, N., Amitsuka, H., Mydosh, J. A.
Temperature- and field-dependent measurements of the Hall effect of pure and 4 % Rh-doped URu$_{2}$Si$_{2}$ reveal low density (0.03 hole/U) high mobility carriers to be unique to the `hidden order'...
Geometric Frustration and Dimensional Reduction at a Quantum Critical Point (2006)
Batista, C. D., Schmalian, J., Kawashima, N., Sengupta, P., Sebastian, S. E., Harrison, N., ...
We show that the spatial dimensionality of the quantum critical point associated with Bose--Einstein condensation at T=0 is reduced when the underlying lattice comprises a set of layers coupled by a...
McDonald, R. D., Singleton, J., Goddard, P. A., Harrison, N., Mielke, C. H.
We describe instrumentation designed to perform millimeter-wave conductivity measurements in pulsed high magnetic fields at low temperatures. The main component of this system is an entirely...
Singleton, J., McDonald, R. D., Harrison, N.
The large charge-transfer anisotropy of quasi-one- and quasi-two-dimensional crystalline organic metals means that magnetoresistance is one of the most powerful tools for probing their bandstructure...
Orbitally quantized density-wave states perturbed from equilibrium (2006)
Harrison, N., McDonald, R. D., Singleton, J.
We consider the effect that a change in the magnetic induction B has in causing an orbitally quantized field-induced spin- or charge density wave (FISDW or FICDW) state to depart from thermodynamic...
Role of anisotropy in the spin-dimer compound BaCuSi2O6 (2006)
Sebastian, Suchitra E., Tanedo, P., Goddard, P. A., Wilson, A., Kim, S., ...
We present results of magnetisation and electron paramagnetic resonance experiments on the spin-dimer system BaCuSi2O6. Evidence indicates that the origin of anisotropic terms in the spin Hamiltonian...
Dimensional reduction at a quantum critical point (2006)
Sebastian, S. E., Harrison, N., Batista, C. D., Balicas, L., Jaime, M., Sharma, P. A., ...
Competition between electronic ground states near a quantum critical point (QCP) - the location of a zero-temperature phase transition driven solely by quantum-mechanical fluctuations - is expected...
Non-local Magnetic Field-tuned Quantum Criticality in Cubic CeIn_{3-x}Sn_x (x=~0.25) (2006)
Silhanek, A. V., Harrison, N., Jaime, M., Fanelli, V., ...
We show that antiferromagnetism in lightly (~8 %) Sn-doped CeIn_3 terminates at a critical field \mu_0H_c= 42 \pm 2 T. Electrical transport and thermodynamic measurements reveal that the effective...
Γ5 quasiparticles and avoided quantum criticality in U(Ru, Rh)2Si2 (2006)
Silhanek, A. V., Harrison, N., Batista, C. D., Jaime, M., Lacerda, A., Amitsuka, H., ...
Hall effect evolution across a field-induced phase in U(Ru0.96Rh0.04)2Si2 (2006)
Oh, Y. S., Kim, K. H., Harrison, N., Sharma, P. A., Amitsuka, H., Mydosh, J. A.
On the Bose-Einstein Condensation of Magnons in Cs2CuCl4 (2005)
Sebastian, S. E., Zapf, V. S., Harrison, N., Batista, C. D., Sharma, P. A., Jaime, M., ...
In a recent paper \cite{Radu}, Radu \textit{et al.} report experimental results they claim to support Bose-Einstein condensation (BEC) of magnons in Cs$_2$CuCl$_4$. It is true that an experimentally...
Sharma, P. A., Harrison, N., Jaime, M., Oh, Y. S., Kim, K. H., Batista, C. D., ...
A dramatic increase in the total thermal conductivity (k) is observed in the Hidden Order (HO) state of single crystal URu2Si2. Through measurements of the thermal Hall conductivity, we explicitly...
Silhanek, A. V., Jaime, M., Harrison, N., Fanelli, V., Batista, C. D., Amitsuka, H., ...
We report measurements and analysis of the specific heat and magnetocaloric effect at the phase boundary into the single magnetic field-induced phase (phase II) of U(Ru{0.96}Rh{0.04})2Si2, which...
Gamma5 quasiparticles and avoided quantum criticality in U(Ru,Rh)2Si2 (2005)
Harrison, N., Silhanek, A. V., Batista, C. D., Jaime, M., Lacerda, A., Amitsuka, H., ...
We discuss recent specific heat data in high magnetic fields on URu2Si2 and 4% Rh-doped URu2Si2 as well as previously published de Haas-van Alphen data at lower magnetic fields in pure URu2Si2; both...
Bose-Einstein Condensation of S = 1 Ni spin degrees of freedom in NiCl2-4SC(NH2)2 (2005)
Zapf, V. S., Zocco, D., Jaime, M., Harrison, N., Lacerda, A., Batista, C. D., ...
It has recently been suggested that the organic compound NiCl$_2$-4SC(NH$_2$)$_2$ (DTN) exhibits Bose-Einstein Condensation (BEC) of the Ni spin degrees of freedom for fields applied along the...
Zapf, V. S., Beyer, A. D., Hughes, C. R., Mielke, C. H., Harrison, N., ...
The high magnetic-field phase diagram of the electron-doped infinite layer high-temperature superconducting (high-T-c) compound Sr0.9La0.1CuO2 was probed by means of penetration depth and...
Singleton, J., Harrison, N., McDonald, R., Goddard, P. A., Bangura, A., Coldea, A., ...
After a brief introduction to crystalline organic superconductors and metals, we shall describe two recently-observed exotic phases that occur only in high magnetic fields. The first involves...
Quantum Criticality in an Organic Magnet (2005)
Stone, M. B., Broholm, C., Reich, D. H., Tchernyshyov, O., Vorderwisch, P., Harrison, N.
Exchange interactions between $S=\frac{1}{2}$ sites in piperazinium hexachlorodicuprate produce a frustrated bilayer magnet with a singlet ground state. We have determined the field-temperature phase...
Quantum critical 5f-electrons avoid singularities in U(Ru,Rh)2Si2 (2005)
Silhanek, A. V., Harrison, N., Batista, C. D., Jaime, M., Lacerda, A., Amitsuka, H., ...
We present specific heat measurements of 4% Rh-doped U(Ru,Rh)2Si2 at magnetic fields above the proposed metamagnetic transition field Hm~34 T, revealing striking similarities to the isotructural Ce...
Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6 (2005)
Sebastian, S. E., Sharma, P. A., Jaime, M., Harrison, N., Correa, V., Balicas, L., ...
We report an experimental determination of the phase boundary between a quantum paramagnetic state and the proposed spin Bose-Einstein condensate of triplons in the spin gap compound BaCuSi2O6. The...
Catastrophic Fermi surface reconstruction in the shape-memory alloy AuZn (2005)
Goddard, P. A, Singleton, J., McDonald, R. D., Harrison, N., Lashley, J. C., Harima, H., ...
AuZn undergoes a shape-memory transition at 67 K. The de Haas van Alphen effect persists to 100 K enabling the observation of a change in the quantum oscillation spectrum indicative of a catastrophic...
Fermi Surface as a Driver for the Shape-Memory Effect in AuZn (2005)
McDonald, R. D., Lashley, J. C., Singleton, J., Goddard, P. A., Drymiotis, F., Harrison, N., ...
Martensites are materials that undergo diffusionless, solid-state transitions. The martensitic transition yields properties that depend on the history of the material and may allow it to recover its...
Quantum Critical 5f Electrons Avoid Singularities in U(Ru, Rh)2Si2 (2005)
Silhanek,A. V., Harrison,N., Batista,C. D., Jaime,M., Lacerda,A., Amitsuka,H., ...
Quantum Critical 5f Electrons Avoid Singularities in U(Ru, Rh)2Si2 (2005)
Silhanek, A. V., Harrison, N., Batista, C. D., Jaime, M., Lacerda, A., Amitsuka, H., ...
Nexus between Quantum Criticality and Phase Formation in U(Ru1-xRhx)2Si2 (2004)
Kim,K. H., Harrison,N., Amitsuka,H., Jorge,G. A., Jaime,M., Mydosh,J. A.
Kim, K. H., Harrison, N., Amitsuka, H., Jorge, G. A., Jaime, M., Mydosh, J. A.
This posting contains raw data used for extracting features of the phase diagram and quantum criticality versus magnetic field $B$, temperature $T$ and Rh-doping $x$ that will soon appear in Physical...
McDonald, R. D., Harrison, N., Singleton, J., Bangura, A., Goddard, P. A., Ramirez, A. P., ...
A finite transfer integral $t_a$ orthogonal to the conducting chains of a highly one-dimensional metal gives rise to empty and filled bands that simulate an indirect-gap semiconductor upon formation...
Absence of field-induced charge-density wave states in (Per)$_2$Pt(mnt)$_2$ (2004)
McDonald, R. D., Harrison, N., Goddard, P., Singleton, J., Chi, X.
Graf {\it et al.} [Phys. Rev. Lett. {\bf 93} 076406 (2004)] recently attributed features in the magnetic-field-dependent longitudinal resistance of (Per)$_2$Pt(mnt)$_2$ to a cascade of field-induced...
Graf, D., Choi, E. S., Brooks, J. S., Harrison, N., Murata, K., Konoike, T., ...
We have investigated the magnetic field-induced metal-insulator transition in the tau-phase organic conductors, which occurs in fields above 35 T, and below 14 K, by magnetization, thermoelectric,...
Drymiotis, F., Singleton, J., Harrison, N., Balicas, L., Bangura, A., Mielke, C. H., ...
The $\gamma-\alpha$ transition in Ce$_{0.8}$La$_{0.1}$Th$_{0.1}$ is measured as a function of applied magnetic field using both resistivity and magnetization. The $\gamma - \alpha$ transition...
Zapf, V. S., Beyer, A. D., Hughes, C. R., Mielke, C. H., Harrison, N., ...
The high magnetic field phase diagram of the electron-doped infinite layer high-temperature superconducting (high-T_c) compound Sr_{0.9}La_{0.1}CuO_2 was probed by means of penetration depth and...
Novel competing orders near the field-induced quantum critical point in URu2Si2 (2004)
Kim,K. H., Harrison,N., Jaime,M., Boebinger,G. S., Mydosh,J. A.
Magnetic-field-induced critical behavior in the hidden-order compound URu2Si2 (2004)
Jaime,M., Kim,K. H., Harrison,N., Jorge,G., Boebinger,G. S., Mydosh,J. A.
Magnetic Field-Induced Condensation of Triplons in Han Purple Pigment BaCuSi$_2$O$_6$ (2004)
Jaime, M., Correa, V. F., Harrison, N., Batista, C. D., Kawashima, N., Kazuma, Y., ...
Besides being an ancient pigment, BaCuSi$_2$O$_6$ is a quasi-2D magnetic insulator with a gapped spin dimer ground state. The application of strong magnetic fields closes this gap creating a gas of...
High Field behavior of the Spin Gap compound Sr$_2$Cu(BO$_3$)$_2$ (2004)
Sebastian, Suchitra E., Yin, D., Tanedo, P., Jorge, G. A., Harrison, N., Jaime, M., ...
We report magnetization and heat capacity measurements of single crystal samples of the spin gap compound Sr$_2$Cu(BO$_3$)$_2$. Low-field data show that the material has a singlet ground state...
Magnetic-field-induced critical behavior in the hidden-order compound URu2Si2 (2004)
Jaime, M., Kim, K. H., Harrison, N., Jorge, G., Boebinger, G. S., Mydosh, J. A.
Nexus between Quantum Criticality and Phase Formation in U(Ru1-xRhx)2Si2 (2004)
Kim, K. H., Harrison, N., Amitsuka, H., Jorge, G. A., Jaime, M., Mydosh, J. A.
Novel competing orders near the field-induced quantum critical point in URu2Si2 (2004)
Kim, K. H., Harrison, N., Jaime, M., Boebinger, G. S., Mydosh, J. A.
Magnetic-Field-Induced Quantum Critical Point and Competing Order Parameters in URu2Si2 (2003)
Kim,K. H., Harrison,N., Jaime,M., Boebinger,G. S., Mydosh,J. A.
Charge-density Waves Survive the Pauli Paramagnetic Limit (2003)
McDonald, R., Harrison, N., Balicas, L., Kim, K. H., Singleton, J., Chi, X.
Measurements of the resistance of single crystals of (Per)$_2$Au(mnt)$_2$ have been made at magnetic fields $B$ of up to 45 T, exceeding the Pauli paramagnetic limit of $B_{\rm P}\approx 37$ T. The...
Harrison, N., Singleton, J., Bangura, A., Ardavan, A., Goddard, P. A., McDonald, R. D., ...
Single crystals of the organic charge-transfer salts $\alpha$-(BEDT-TTF)$_2M$Hg(SCN)$_4$ have been studied using Hall-potential measurements ($M=$K) and magnetization experiments ($M$ = K, Rb). The...
Tuning heavy fermion systems into quantum criticality by magnetic field (2003)
Gegenwart,P., Custers,J., Tayama,T., Tenya,K., Geibel,C., Sparn,G., ...
High Field Specific Heat of 2D Quantum Spin System SrCu2(BO3)2 (2003)
Jorge, G. A., Stern, R., Jaime, M., Harrison, N., Bonca, J., Shawish, S. El, ...
We report measurements of the specific heat of the quantum spin liquid system SrCu2(BO3)2 in continuous magnetic fields H of up to 33 T. The specific heat vs temperature at zero field shows an...
PATENT: US Patent No.6,612,510 B1 Aerosol Spraying (2003)
Hughes, J F, Whitmore, L F, Fox, R T, Harrison, N, Harper, D R
PATENT: US Patent No.6,612,510 B1 Aerosol Spraying (2003)
Hughes, J F, Whitmore, L F, Fox, R T, Harrison, N, Harper, D R