80 citations · 367 across the 13 of their papers we have counts for
13 papers
Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMnAs
M. Ramazanoglu, A. Sapkota, Abhishek Pandey +8
BaMnAs is an antiferromagnetic insulator where a metal-insulator transition occurs with hole doping via the substitution of Ba with K. The metal-insulator transition ca…
Identification of the low-energy excitations in a quantum critical system
Tom Heitmann, Jagat Lamsal, Shannon Watson +4
We have identified low-energy magnetic excitations in a doped quantum critical system by means of polarized neutron scattering experiments. The presence of these excitations could…
On the extraction of paramagnon excitations from resonant inelastic X-ray scattering experiments
Jagat Lamsal, Wouter Montfrooij
Resonant X-ray scattering experiments on high-temperature superconductors and related cuprates have revealed the presence of intense paramagnon scattering at high excitation energi…
Neutron-scattering measurements of the spin excitations in LaFeAsO and Ba(FeCo)As: Evidence for a sharp enhancement of spin fluctuations by nematic order
Qiang Zhang, Rafael M. Fernandes, Jagat Lamsal +11
Inelastic neutron scattering was employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(FeCo)As. T…
Stripe Antiferromagnetic Spin Fluctuations in SrCoAs
W. Jayasekara, Y. Lee, Abhishek Pandey +12
Inelastic neutron scattering measurements of paramagnetic SrCoAs at T=5 K reveal antiferromagnetic (AFM) spin fluctuations that are peaked at a wavevector of $\textbf{Q…
Persistence of local-moment antiferromagnetic order in Ba(1-x)KxMn2As2
J. Lamsal, G. S. Tucker, T. W. Heitmann +7
BaMn2As2 is a local-moment antiferromagnetic insulator with a Néel temperature of 625 K and a large ordered moment of 3.9 Bohr magneton per Mn. Remarkably, this compound can be dri…
Effects of transition metal substitutions on the incommensurability and spin fluctuations in BaFe2As2 by elastic and inelastic neutron scattering
M. G. Kim, J. Lamsal, T. W. Heitmann +17
The spin fluctuation spectra from nonsuperconducting Cu-substituted, and superconducting Co-substituted, BaFe2As2 are compared quantitatively by inelastic neutron scattering measur…
Observation of spin glass state in weakly ferromagnetic SrFeCoO double perovskite
R. Pradheesh, Harikrishnan S. Nair, C. M. N. Kumar +7
We report the observation of spin glass state in the double perovskite oxide SrFeCoO prepared through sol-gel technique. Initial structural studies using x rays reveal…
Ba{1-x}KxMn2As2: An Antiferromagnetic Local-Moment Metal
Abhishek Pandey, R. S. Dhaka, J. Lamsal +9
The compound BaMn2As2 with the tetragonal ThCr2Si2 structure is a local-moment antiferromagnetic insulator with a Neel temperature TN = 625 K and a large ordered moment mu = 3.9 mu…
Cluster formation in quantum critical systems
Tom Heitmann, John Gaddy, Jagat Lamsal +1
The presence of magnetic clusters has been verified in both antiferromagnetic and ferromagnetic quantum critical systems. We review some of the strongest evidence for strongly dope…
Comment on "Evidence for a non Fermi liquid phase in Ge-substituted YbRhSi"
John Gaddy, Tom Heitmann, Jagat Lamsal +1
In a recent paper, Custers {\it et al.} \cite{custers} argue for the existence of a new metallic quantum critical phase at 0 K in the Ge-doped heavy-fermion system YbRhSi i…
Magnetic excitations in the spinel compound Li[MnLi]O (x= 0.2, 0.6, 0.8, 1.0): how a classical system can mimic quantum critical scaling
Thomas Heitmann, Alexander Schmets, John Gaddy +4
We present neutron scattering results on the magnetic excitations in the spinel compounds Li[MnLi]O (x= 0.2, 0.6, 0.8, 1.0). We show that the dominant exc…
The ground state of a quantum critical system
Wouter Montfrooij, Jagat Lamsal, Meigan Aronson +7
The competition between the tendency of magnetic moments to order at low temperatures, and the tendency of conduction electrons to shield these moments, can result in a phase trans…