Publications (18)
Normal state and superconducting state properties of high entropy Ta0.2Nb0.2V0.2Ti0.2X0.2 (X = Zr and Hf )
Nikita Sharma, J. Link, Kuldeep Kargeti +7
High entropy alloy superconductors represent a unique blend of advanced material systems and quantum physics, offering significant potential for advancing superconducting technolog…
Freezing of molecular rotation in a paramagnetic crystal studied by P NMR
D. Opherden, F. Bärtl, Sh. Yamamoto +9
We present a detailed P nuclear magnetic resonance (NMR) study of the molecular rotation in the compound [Cu(pz)(2-HOpy)](PF), where pz = CHN…
High Field Specific Heat of 2D Quantum Spin System SrCu2(BO3)2
G. A. Jorge, R. Stern, M. Jaime +6
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 fi…
NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSiO
S. Kramer, R. Stern, M. Horvatic +3
We present a Cu and Si NMR study of the quasi-2D coupled spin 1/2 dimer compound BaCuSiO in the magnetic field range 13-26 T and at temperatures as low as…
A Unifying Framework for Formal Theories of Novelty:Framework, Examples and Discussion
T. E. Boult, P. A. Grabowicz, D. S. Prijatelj +11
Managing inputs that are novel, unknown, or out-of-distribution is critical as an agent moves from the lab to the open world. Novelty-related problems include being tolerant to nov…
Science Objectives for an X-Ray Microcalorimeter Observing the Sun
J. Martin Laming, J. Adams, D. Alexander +57
We present the science case for a broadband X-ray imager with high-resolution spectroscopy, including simulations of X-ray spectral diagnostics of both active regions and solar fla…
Spin-Peierls transition in TiPO
J. M. Law, C. Hoch, R. Glaum +6
We investigated the magnetic and structural properties of the quasi-one dimensional 3-quantum chain system TiPO ( 965 K) by magnetic susceptibility, heat capacity,…
Spin-Triplet Excitons in the Gapped Antiferromagnet BaCuSiO: Electron Paramagnetic Resonance Studies
S. A. Zvyagin, J. Wosnitza, J. Krzystek +4
BaCuSiO, a quantum antiferromagnet with a double-layer structure of Cu ions in a distorted planar-rectangular coordination and with a dimerized spin singlet…
Two types of adjacent dimer layers in the low temperature phase of BaCuSi2O6
D. V. Sheptyakov, V. Yu. Pomjakushin, R. Stern +3
The low-temperature crystal structure of BaCuSi2O6 has been investigated with high-resolution synchrotron x-ray and neutron powder diffraction techniques and has been found to be o…
Magnetic Field-Induced Condensation of Triplons in Han Purple Pigment BaCuSiO
M. Jaime, V. F. Correa, N. Harrison +9
Besides being an ancient pigment, BaCuSiO is a quasi-2D magnetic insulator with a gapped spin dimer ground state. The application of strong magnetic fields closes this gap…
Molecular orientational dynamics of the endohedral fullerene ScN@C as probed by C and Sc NMR
K. R. Gorny, C. H. Pennington, J. A. Martindale +4
We measure 13C and 45Sc NMR lineshapes and spin-lattice relaxation times (T1) to probe the orientational dynamics of the endohedral metallofullerene Sc3N@C80. The measurements show…
Magnetic anisotropy in the frustrated spin chain compound -TeVO
F. Weickert, M. Jaime, N. Harrison +8
Isotropic and anisotropic magnetic behavior of the frustrated spin chain compound -TeVO is reported. Three magnetic transitions observed in zero magnetic field are tracked…
Extremely well isolated 2D spin- antiferromagnetic Heisenberg layers with small exchange coupling in the molecular-based magnet CuPOF
D. Opherden, N. Nizar, K. Richardson +23
We report on a comprehensive characterization of the newly synthesized Cu-based molecular magnet [Cu(pz)(2-HOpy)](PF) (CuPOF), where pz = CHN and…
Single crystal growth of Cu4(OH)6BrF and universal behavior in quantum spin liquid candidates synthetic barlowite and herbertsmithite
C. M. Pasco, B. A. Trump, Thao T. Tran +5
Synthetic barlowite, Cu4(OH)6BrF, has emerged as a new quantum spin liquid (QSL) host, containing kagome layers of S=1/2 Cu2+ ions separated by interlayer Cu2+ ions. Similar to syn…
Spatially Resolved Magnetization in the Bose-Einstein Condensed State of BaCuSi2O6: Evidence for Imperfect Frustration
S. Krämer, N. Laflorencie, R. Stern +5
In order to understand the nature of the two-dimensional Bose-Einstein condensed (BEC) phase in BaCuSi2O6, we performed detailed 63Cu and 29Si NMR above the critical magnetic field…
NMR, magnetization, and heat capacity studies of the uniform spin-1/2 chain compound Bi6V3O16
T. Chakrabarty, I. Heinmaa, V. Yu. Verchenko +2
We report the local (NMR) and bulk (magnetization and heat capacity) properties of the vanadium-based S=1/2 uniform spin chain compound Bi6V3O16(Bi4V2O10.66). In the low-temperatur…
PHA*: Finding the Shortest Path with A* in An Unknown Physical Environment
A. Ben-Yair, A. Felner, S. Kraus +2
We address the problem of finding the shortest path between two points in an unknown real physical environment, where a traveling agent must move around in the environment to explo…
Spin pseudo-gap and interplane coupling in Y_2Ba_4Cu_7O_{15}: a ^{63}Cu nuclear spin-spin relaxation study
R. Stern, M. Mali, J. Roos +1
We report measurements of the Gaussian contribution, T_{2G}, to the plane ^{63}Cu nuclear spin--spin relaxation time in the YBa_2Cu_3O_7 and YBa_2Cu_4O_8 blocks of normal and super…