R. Birgeneau

activity

20042026

most citedWidespread spin polarization effects in photoemission from topological insulators

119 citations · 894 across the 24 of their papers we have counts for

collaborators

24 papers

cond-mat.mtrl-sci2026

High-Temperature ferromagnetism from site-selective filling in (Fe,Ni) $_{6 - δ}$ GeTe $_{2}$

Tyler L. Werner, Jonathan T. Reichanadter, Xiang Chen +23

The discovery of high-temperature ferromagnetism in the metallic van der Waals (vdW) system Fe $_{N}$ GeTe $_{2}$ has brought two-dimensional (2D) magnets into technologically relevant te…

cond-mat.str-el2026

Stacking-dependent anisotropic altermagnetism in V $_{1/3}$ NbS $_{2}$

Chris J. Lygouras, Nathan Prouse, Jack H. Drouin +14

We report profound impacts of the stacking sequence of triangular lattices of magnetic transition metal ions intercalated between the layers of the van der Waals material NbS $_{2}$ .…

cond-mat.str-el2025★ 1 cited

Dichotomy of flat bands in the van der Waals ferromagnet Fe $_{5}$ GeTe $_{2}$

Han Wu, Jianwei Huang, Chaowei Hu +28

Quantum materials with bands of narrow bandwidth near the Fermi level represent a promising platform for exploring a diverse range of fascinating physical phenomena, as the high de…

cond-mat.str-el2024★ 2 cited

Antiferromagnetic order in a layered magnetic topological insulator MnBi $_{2}$ Se $_{4}$ probed by resonant soft x-ray scattering

Xiang Chen, Alejandro Ruiz, Alexander J. Bishop +9

The quasi-two-dimensional magnetic topological insulator MnBi $_{2}$ Se $_{4}$ , stabilized via non-equilibrium molecular beam epitaxy, is investigated by resonant soft x-ray scattering. K…

cond-mat.str-el2019★ 15 cited

Intertwined magnetic and nematic orders in semiconducting KFe $_{0.8}$ Ag $_{1.2}$ Te $_{2}$

Yu Song, Huibo Cao, B. C. Chakoumakos +5

Superconductivity in the iron pnictides emerges from metallic parent compounds exhibiting intertwined stripe-type magnetic order and nematic order, with itinerant electrons suggest…

cond-mat.supr-con2018★ 14 cited

Spectral Evidence for Emergent Order in Ba $_{1 - x}$ Na $_{x}$ Fe $_{2}$ As $_{2}$

M. Yi, A. Frano, D. H. Lu +21

We report an angle-resolved photoemission spectroscopy study of the iron-based superconductor family, Ba $_{1 - x}$ Na $_{x}$ Fe $_{2}$ As $_{2}$ . This system harbors the recently discovered doub…

cond-mat.str-el2016★ 34 cited

Spin waves and magnetic exchange interactions in the spin ladder compound RbFe $_{2}$ Se $_{3}$

Meng Wang, Ming Yi, Shangjian Jin +9

We report an inelastic neutron scattering study of the spin waves of the one-dimensional antiferromagnetic spin ladder compound RbFe $_{2}$ Se $_{3}$ . The results reveal that the products…

cond-mat.supr-con2015★ 2 cited

Structural and antiferromagnetic properties of Ba(Fe $_{1 - x - y}$ Co $_{x}$ Rh $_{y}$ ) $_{2}$ As $_{2}$ compounds

M. G. Kim, T. W. Heitmann, S. R. Mulcahy +2

We present a systematic investigation of the electrical, structural, and antiferromagnetic properties for the series of Ba(Fe $_{1 - x - y}$ Co $_{x}$ Rh $_{y}$ ) $_{2}$ As $_{2}$ compounds wit…

cond-mat.supr-con2015★ 13 cited

Mott localization in a pure stripe antiferromagnet Rb $_{1 - δ}$ Fe $_{1.5 - σ}$ S $_{2}$

Meng Wang, Ming Yi, Huibo Cao +8

A combination of neutron diffraction and angle-resolved photoemission spectroscopy measurements on a pure antiferromagnetic stripe Rb $_{1 - δ}$ Fe $_{1.5 - σ}$ S $_{2}$ is reported. A neutro…

cond-mat.supr-con2015★ 21 cited

Bandwidth and Electron Correlation-Tuned Superconductivity in Rb $_{0.8}$ Fe $_{2}$ (Se $_{1 - z}$ S $_{z}$ ) $_{2}$

M. Yi, Meng Wang, A. F. Kemper +8

We present a systematic angle-resolved photoemission spectroscopy study of the substitution-dependence of the electronic structure of Rb $_{0.8}$ Fe $_{2}$ (Se $_{1 - z}$ S $_{z}$ ) $_{2}$ (z = 0…

cond-mat.supr-con2014★ 19 cited

Two spatially separated phases in semiconducting Rb $_{0.8}$ Fe $_{1.5}$ S $_{2}$

Meng Wang, Wei Tian, P. Valdivia +4

We report neutron scattering and transport measurements on semiconducting Rb $_{0.8}$ Fe $_{1.5}$ S $_{2}$ , a compound isostructural and isoelectronic to the well-studied $A_{0.8}$ Fe$_{y}…

cond-mat.supr-con2014★ 17 cited

Neutron Scattering Measurements of Spatially Anisotropic Magnetic Exchange Interactions in Semiconducting K0.85Fe1.54Se2 (TN=280 K)

Jun Zhao, Yao Shen, R. J. Birgeneau +7

We use neutron scattering to study the spin excitations associated with the stripe antiferromagnetic (AFM) order in semiconducting K $_{0.85}$ Fe $_{1.54}$ Se $_{2}$ ( $T_{N}$ = $280$ K). We s…

cond-mat.str-el2013★ 7 cited

Spin polarization of Ru in superconducting Ba(Fe $_{0.795}$ Ru $_{0.205}$ ) $_{2}$ As $_{2}$ studied by x-ray resonant magnetic scattering

M. G. Kim, J. Soh, J. Lang +8

We have employed the x-ray resonant magnetic scattering (XRMS) technique at the Ru $L_{2}$ edge of the Ba(Fe $_{1 - x}$ Ru $_{x}$ ) $_{2}$ As $_{2}$ ( $x = 0.205$ ) superconductor. We show that prono…

cond-mat.str-el2013★ 63 cited

Lifetimes of antiferromagnetic magnons in two and three dimensions: experiment, theory, and numerics

S. P. Bayrakci, D. A. Tennant, Ph. Leininger +5

A high-resolution neutron spectroscopic technique is used to measure momentum-resolved magnon lifetimes in the prototypical two- and three-dimensional antiferromagnets Rb2MnF4 and…

cond-mat.supr-con2012★ 90 cited

Neutron-Diffraction Measurements of an Antiferromagnetic Semiconducting Phase in the Vicinity of the High-Temperature Superconducting State of K $_{x}$ Fe $_{2 - y}$ Se $_{2}$

Jun Zhao, Huibo Cao, E. Bourret-Courchesne +2

The recently discovered K-Fe-Se high temperature superconductor has caused heated debate regarding the nature of its parent compound. Transport, angle-resolved photoemission spectr…

cond-mat.supr-con2011★ 3 cited

A neutron scattering study of the under-doped Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ , x=0.09 and 0.17 self-flux grown single crystals and the universality of the tricritical point

C. R. Rotundu, W. Tian, K. C. Rule +4

We present a combination of elastic neutron scattering measurements in zero and 14.5 T and magnetization measurements in zero and 14 T on under-doped superconducting Ba $_{1 - x}$ K$_{…

cond-mat.supr-con2011★ 105 cited

Effect of uniaxial strain on the structural and magnetic phase transitions in BaFe $_{2}$ As $_{2}$

Chetan Dhital, Z. Yamani, Wei Tian +5

We report neutron scattering experiments probing the influence of uniaxial strain on both the magnetic and structural order parameters in the parent iron pnictide compound, BaFe$_2…

cond-mat.mtrl-sci2011★ 119 cited

Widespread spin polarization effects in photoemission from topological insulators

Chris Jozwiak, Yulin Chen, Alexei V. Fedorov +11

High resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi $_{2}$ Se $_{3}$ using a recently develope…

cond-mat.supr-con2011★ 51 cited

First and second order magnetic and structural transitions in BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$

C. R. Rotundu, R. J. Birgeneau

We present here high resolution magnetization measurements on high-quality BaFe $_{2 (1 - x)}$ Co $_{2 x}$ As $_{2}$ , 0 $\leq$ x $\leq$ 0.046 as-grown single crystals. The results confirm the e…

cond-mat.supr-con2011★ 113 cited

Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations

Jinsheng Wen, Guangyong Xu, Genda Gu +2

In this review, we present a summary of the results on single crystal growth of two types of iron-chalcogenide superconductors, Fe(1+y)Te(1-x)Se(x) (11), and A(x)Fe(2-y)Se(2) (A= K…

cond-mat.supr-con2010★ 18 cited

Antiferromagnetic Critical Fluctuations in BaFe $_{2}$ As $_{2}$

Stephen D. Wilson, Z. Yamani, C. R. Rotundu +7

Magnetic correlations near the magneto-structural phase transition in the bilayer iron pnictide parent compound, BaFe $_{2}$ As $_{2}$ , are measured. In close proximity to the antiferroma…

cond-mat.supr-con2009★ 33 cited

Universal magnetic and structural behaviors in the iron arsenides

Stephen D. Wilson, C. R. Rotundu, Z. Yamani +4

Commonalities among the order parameters of the ubiquitous antiferromagnetism present in the parent compounds of the iron arsenide high temperature superconductors are explored. Ad…

cond-mat.supr-con2009★ 61 cited

Phase diagram of the PrFeAsO $_{1 - x}$ F $_{x}$ superconductor

C. R. Rotundu, D. T. Keane, B. Freelon +5

The electronic phase diagram of PrFeAsO $_{1 - x}$ F $_{x}$ (0 $\leq$ x $\leq$ 0.225) has been determined using synchrotron X-ray powder diffraction, magnetization and resistivity measureme…

cond-mat.str-el2004★ 93 cited

Field-induced transition between magnetically disordered and ordered phases in underdoped La(2-x)SrxCuO4

B. Khaykovich, S. Wakimoto, R. J. Birgeneau +5

We report the observation of a magnetic-field-induced transition between magnetically disordered and ordered phases in slightly under-doped La(2-x)SrxCuO4 with x=0.144. Static inco…

High-Temperature ferromagnetism from site-selective filling in (Fe,Ni)6−δ​GeTe2​

Stacking-dependent anisotropic altermagnetism in V1/3​NbS2​

Dichotomy of flat bands in the van der Waals ferromagnet Fe5​GeTe2​

Antiferromagnetic order in a layered magnetic topological insulator MnBi2​Se4​ probed by resonant soft x-ray scattering

Intertwined magnetic and nematic orders in semiconducting KFe0.8​Ag1.2​Te2​

Spectral Evidence for Emergent Order in Ba1−x​Nax​Fe2​As2​

Spin waves and magnetic exchange interactions in the spin ladder compound RbFe2​Se3​

Structural and antiferromagnetic properties of Ba(Fe1−x−y​Cox​Rhy​)2​As2​ compounds

Mott localization in a pure stripe antiferromagnet Rb1−δ​Fe1.5−σ​S2​

Bandwidth and Electron Correlation-Tuned Superconductivity in Rb0.8​Fe2​(Se1−z​Sz​)2​

Two spatially separated phases in semiconducting Rb0.8​Fe1.5​S2​