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...
Chiatti, O., Sytcheva, A., Wosnitza, J., Zherlitsyn, S., Zvyagin, A. A., Zapf, V. S., ...
We report results of magneto-acoustic studies in the quantum spin-chain magnet NiCl$_2$-4SC(NH$_2$)$_2$ (DTN) having a field-induced ordered antiferromagnetic (AF) phase. In the vicinity of the...
Kohama, Y., Kamihara, Y., Baily, S. A., Civale, L., Riggs, S. C., Balakirev, F. F., ...
The electrical resistivity (rxx) and Hall resistivity (rxy) have been measured over wide composition range using 60 T pulsed magnets. While the superconducting phase diagram (Tc, x) displays the...
Thielemann, B., Rüegg, Ch., Kiefer, K., Rønnow, H. M., Bouillot, P., Kollath, C., ...
The transition from a magnetic field-tuned spin Luttinger-liquid with algebraic spin correlations to a Bose-Einstein Condensate of magnons with long-range magnetic order is investigated in the...
Hall coefficient and Hc2 in underdoped LaFeAsO0.95F0.05 (2008)
Kohama, Y., Kamihara, Y., Riggs, S., Balakirev, F. F., Atake, T., Jaime, M., ...
The electrical resistivity and Hall coefficient of LaFeAsO0.95F0.05 polycrystalline samples were measured in pulsed magnetic fields up to m0H = 60 T from room temperature to 1.5 K. The resistance of...
Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8 (2008)
Samulon, E. C., Sengupta, P., Batista, C. D., Jaime, M., Balicas, L., ...
Ba3Mn2O8 is a spin-dimer compound based on pairs of S=1, 3d^2, Mn^{5+} ions arranged on a triangular lattice. Antiferromagnetic intradimer exchange leads to a singlet ground state in zero-field. Here...
Spin Dynamics of $Ni Cl_2-4SC(NH_2)_2$ in the Field-Induced Ordered Phase (2008)
Zvyagin, S. A., Wosnitza, J., Kolezhuk, A. K., Zapf, V. S., Jaime, M., Paduan-Filho, A., ...
$Ni Cl_2$-$4SC(NH_2)_2$ (known as DTN) is a spin-1 material with a strong single-ion anisotropy that is regarded as a new candidate for Bose-Einstein condensation (BEC) of spin degrees of freedom. We...
SiC and Carbon Nanotube Distinctive Effects on the Superconducting Properties of Bulk MgB2 (2008)
Serrano, G., Serquis, A., Dou, S. X., Soltanian, S., Civale, L., Maiorov, B., ...
This work describes in detail the simultaneous enhancement of the upper critical field (Hc2) and the critical current density (Jc) of MgB2 bulk samples doped with nano-SiC particles, as well as...
SiC and Carbon Nanotube Distinctive Effects on the Superconducting Properties of Bulk MgB2 (2008)
Serrano, G., Serquis, A., Dou, S. X., Soltanian, S., Civale, L., Maiorov, B., ...
This work describes in detail the simultaneous enhancement of the upper critical field (Hc2) and the critical current density (Jc) of MgB2 bulk samples doped with nano-SiC particles, as well as...
Zapf, V. S., Correa, V. F., Sengupta, P., Batista, C. D., Tsukamoto, M., Kawashima, N., ...
We report a method for determining the spatial dependence of the magnetic exchange coupling, $dJ/dr$, from magnetostriction measurements of a quantum magnet. The organic Ni $S = 1$ system...
Zvyagin, S. A., Wosnitza, J., Batista, C. D., Tsukamoto, M., Kawashima, N., Krzystek, J., ...
NiCl$_2$-4SC(NH$_2$)$_2$ (DTN) is a quantum S=1 chain system with strong easy-pane anisotropy and a new candidate for the Bose-Einstein condensation of the spin degrees of freedom. ESR studies of...
Direct transition from a disordered to a multiferroic phase on a triangular lattice (2007)
Kenzelmann, M., Lawes, G., Harris, A. B., Gasparovic, G., Broholm, C., Ramirez, A. P., ...
Competing interactions and geometric frustration provide favourable conditions for exotic states of matter. Such competition often causes multiple phase transitions as a function of temperature and...
Field induced metastabilities in U(Ru0.96Rh0.04)2Si2 (2007)
Silhanek, A. V., Jaime, M., Harrison, N., Batista, C. D., Amitsuka, H., Nakatsuji, S., ...
Correlated enhancement of Hc2 and Jc in carbon nanotube-doped MgB2 (2006)
Serquis, A., Serrano, G., Moreno, S., Maiorov, B., ...
The use of MgB2 in superconducting applications still awaits for the development of a MgB2-based material where both current-carrying performance and critical magnetic field are optimized...
Magnetostriction in the Bose-Einstein Condensate quantum magnet NiCl2-4SC(NH2)2 (2006)
Zapf, V. S., Correa, V. F., Batista, C. D., Murphy, T. P., Palm, E. D., Jaime, M., ...
The quantum magnet NiCl$_2$-4SC(NH$_2$)$_2$ is a candidate for observing Bose-Einstein Condensation of spin degrees of freedom in applied magnetic fields. An XY antiferromagnetic ordered state occurs...
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...
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...
Zvyagin, S. A., Wosnitza, J., Krzystek, J., Stern, R., Jaime, M., Sasago, Y., ...
BaCuSi$_2$O$_6$, a $S=1/2$ quantum antiferromagnet with a double-layer structure of Cu$^{2+}$ ions in a distorted planar-rectangular coordination and with a dimerized spin singlet ground state, is...
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., ...
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...
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...
Inhomogeneous level splitting in Pr2-xBixRu2O7 (2005)
Van Duijn, J, Kim, K H, Hur, N, Adroja, D, Adams, M A, Huang, Q Z, ...
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...
Inhomogeneous level splitting in Pr$_{2-x}$Bi$_x$Ru$_2$O$_7$ (2004)
Van Duijn, J., Kim, K. H., Hur, N., Adroja, D., Adams, M. A., Huang, Q. Z., ...
We report that Bi doping drives Pr$_x$Bi$_{2-x}$Ru$_2$O$_7$ from an antiferromagnetic insulator ($x=2$) to a metallic paramagnet ($x\approx 1$) with a broad low $T$ maximum in $C/T$. Neutron...
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.
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...
Jorge, G. A., Jaime, M., Civale, L., Batista, C. D., Zink, B. L., Hellman, F., ...
We have measured the specific heat and magnetization {\it versus} temperature in a single crystal sample of superconducting La$_{2}$CuO$_{4.11}$ and in a sample of the same material after removing...
Metamagnetism, quantum criticality, hidden order and crystal electric fields in URu2Si2 (2003)
Harrison, N., Kim, K. H., Jaime, M., Mydosh, J. A.
This paper presents a brief synopsis of magnetization, electrical transport, specific heat measurements as well as other recent work on URu2Si2, together with some topical discussions of the...
A Hierarchically-Organized Phase Diagram near a Quantum Critical Point in URu2Si2 (2003)
Kim, K. H., Harrison, N., Jaime, M., Boebinger, G. S., Mydosh, J. A.
A comprehensive transport study, as a function of both temperature and magnetic field in continuous magnetic fields up to 45 T reveals that URu2Si2 possesses all the essential hallmarks of quantum...
Hot isostatic pressing of powder in tube MgB2 wires (2003)
Serquis, A., Civale, L., Hammon, D. L., Liao, X. Z., Coulter, J. Y., Zhu, Y. T., ...
The critical current density (Jc) of hot isostatic pressed (HIPed) MgB2 wires, measured by d.c. transport and magnetization, is compared with that of similar wires annealed at ambient pressure. The...
Re-entrant hidden order at a metamagnetic quantum critical end point (2003)
Harrison, N., Jaime, M., Mydosh, J. A.
Magnetization measurements of URu2Si2 in pulsed magnetic fields of 44 T reveal that the hidden order phase is destroyed before appearing in the form of a re-entrant phase between ~ 36 and 39 T....
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.
High Magnetic Field Studies of the Hidden Order Transition in URu2Si2 (2002)
Jaime,M., Kim,K. H., Jorge,G., McCall,S., Mydosh,J. A.
We studied in detail the low temperature/high magnetic field phases of URu2Si2 single crystals with specific heat, magnetocaloric effect, and magnetoresistance in magnetic fields up to 45 T. Data...
High Field Studies of the Hidden Order Transition in URu$_2$Si$_2$ (2002)
Jaime, M., Kim, K. H., Jorge, G., McCall, S., Mydosh, J. A
We studied in detail the low temperature/high magnetic field phases of URu$_{2}$Si$_{2}$ single crystals with specific heat, magnetocaloric effect, and magnetoresistance in magnetic fields up to 45...
Effects of unreacted Mg impurities on the transport properties of MgB2 (2002)
Jung, C. U., Kim, Heon-Jung, Park, Min-Seok, Kim, Mun-Seog, Kim, J. Y., Du, Zhonglian, ...
We synthesized polycrystalline MgB2 from a stoichiometric mixture of Mg and the 11 B isotope under different conditions. All the samples showed bulk superconductivity with Tc = 38~39 K. The samples...
Magnetotransport of the low-carrier density one-dimensional S=1/2 antiferromagnet Yb4As3 (2002)
Gegenwart,P., Aoki,H., Cichorek,T., Custers,J., Jaime,M., Ochiai,A., ...
The transport properties of the semimetallic quasi-one- dimensional S = 1/2 antiferromagnet Yb4As3 have been studied by performing low-temperature (T greater than or equal to 0.02 K) and high...
Thermodynamic and transport properties of the one-dimensional S=½ antiferromagnet Yb4As3 (2002)
Gegenwart,P., Aoki,H., Cichorek,T., Custers,J., Harrison,N., Jaime,M., ...
The semimetallic quasi-one-dimensional S = 1/2 antiferromagnet Yb4As3 has been studied by performing low-temperature (T) and high magnetic-field (B) measurements of the specific heat, C(T, B),...
Thermodynamic and transport properties of the one-dimensional S=½ antiferromagnet Yb4As3 (2002)
Gegenwart, P., Aoki, H., Cichorek, T., Custers, J., Harrison, N., Jaime, M., ...
The semimetallic quasi-one-dimensional S = 1/2 antiferromagnet Yb4As3 has been studied by performing low-temperature (T) and high magnetic-field (B) measurements of the specific heat, C(T, B),...
Magnetotransport of the low-carrier density one-dimensional S=1/2 antiferromagnet Yb4As3 (2002)
Gegenwart, P., Aoki, H., Cichorek, T., Custers, J., Jaime, M., Ochiai, A., ...
The transport properties of the semimetallic quasi-one- dimensional S = 1/2 antiferromagnet Yb4As3 have been studied by performing low-temperature (T greater than or equal to 0.02 K) and high...
High Magnetic Field Studies of the Hidden Order Transition in URu2Si2 (2002)
Jaime, M., Kim, K. H., Jorge, G., McCall, S., Mydosh, J. A.
We studied in detail the low temperature/high magnetic field phases of URu2Si2 single crystals with specific heat, magnetocaloric effect, and magnetoresistance in magnetic fields up to 45 T. Data...