Priscila Rosa

Los Alamos National Laboratory

Journal article

What causes the variation in superconducting properties of UTe2?

by Caitlin Sophia Kengle, Noah Schnitzer, Mitchell McCarty Bordelon, Sean Michael Thomas and Priscila Rosa

First online publication 11/11/2025

Journal of Magnetism and Magnetic Materials, 173650

Journal article Open access

Magnetic order and physical properties of the kagome metal UNb6⁢Sn6

by Zachary William Riedel, Wolfgang Josef Simeth, Caitlin Sophia Kengle, Sean Michael Thomas, Joe David Thompson, Allen Olaf Scheie, Filip Ronning, Christopher A. Lane, Jianxin Zhu and Priscila Rosa ... (11 authors)

First online publication 08/05/2025

Physical Review Materials, 9, 8, 084401

Journal article Open access

Unusual 5f magnetism in new kagome material UV6Sn6

by Sean Michael Thomas, Caitlin Sophia Kengle, Wolfgang Josef Simeth, Chan-young Lim, Zachary William Riedel, Kevin James Allen, Ashley Corene Schmidt, Michael Ruf, Seonggeon Gim and Joe David Thompson ... (18 authors)

First online publication 07/01/2025

npj Quantum Materials, 10, 1, 66

Journal article Open access

Anisotropic field-induced changes in the superconducting order parameter of UTe2

by Sangyun Lee, Andrew John Woods, Priscila Rosa, Sean Michael Thomas, Eric Dietzgen Bauer, Shizeng Lin and Roman Movshovich

First online publication 06/04/2025

Physical Review Research, 7, 2, L022053

Journal article Open access

Quantum Anomalies in Condensed Matter

by Michael Thompson Pettes, Shizeng Lin, Elizabeth Ann Peterson, Jianxin Zhu, Laurel Elaine Winter Stritzinger, Johanna Christine Palmstrom, Jinkyoung Yoo, Nicholas Steven Sirica, Prashant Padmanabhan and Priscila Rosa ... (12 authors)

First online publication 05/27/2025

Advanced Physics Research

Journal article Open access

Realizing a topological diode effect on the surface of a topological Kondo insulator

by Jiawen Zhang, Zhenqi Hua, Chengwei Wang, Michael Smidman, David Graf, Sean Michael Thomas, Priscila Rosa, Steffen Wirth, Xi Dai and Peng Xiong ... (13 authors)

First online publication 03/20/2025

Proceedings of the National Academy of Sciences, 122, 12, e2417709122

Journal article Open access

Electrodynamics of photo-carriers in multiferroic Eu0.75Y0.25MnO3

by Yue Huang, Rolando V Aguilar, Stuart Alan Trugman, Sang Wook Cheong, Long Yuan, M. C. Lee, Jianxin Zhu, Priscila Rosa, Rohit P. Prasankumar and Dmitry Anatolievitch Yarotski ... (13 authors)

First online publication 02/10/2025

Nanophotonics

Journal article Open access

Absence of bulk charge density wave order in the normal state of UTe2

by Wolfgang Josef Simeth, Caitlin Sophia Kengle, Priscila Rosa, Marc Janoschek, Jakub Vonka, Peter Abbamonte, Sonia Francoual and Johan Chang

First online publication 11/09/2024

Nature Communications, 15, 1, 9713

Journal article Open access Peer reviewed

Stabilization of U 5f2 configuration in UTe2 through U 6d dimers in the presence of Te2 chains

by Denise S. Christovam, Martin Sundermann, Andrea Marino, Daisuke Takegami, Johannes Falke, Paulius Dolmantas, Manuel Harder, Hlynur Gretarsson, Bernhard Keimer and Andrei Gloskovskii ... (21 authors)

Published 09/16/2024

Physical review research, 6, 3, 033299

We investigate the topological superconductor candidate UTe2 using high-resolution valence-band resonant inelastic x-ray scattering at the U M-4,M-5 edges. We observe atomiclike low-energy excitations that support the correlated nature of this unconventional superconductor. These excitations originate from the U 5 f(2) configuration, which is unexpected since the short Te2-Te2 distances exclude Te2 being 2-. By utilizing the photoionization cross-section dependence of the photoemission spectra in combination with band structure calculations, we infer that the stabilization of the U 5 f(2) configuration is due to the U 6d bonding states in the U dimers acting as a charge reservoir. Our results emphasize that the description of the physical properties should commence with a 5 f(2) ansatz.

Journal article Open access Peer reviewed

Mixed-valence state in the dilute-impurity regime of La-substituted SmB6

by M. Zonno, M. Michiardi, F. Boschini, G. Levy, K. Volckaert, D. Curcio, M. Bianchi, P. F. S. Rosa, Z. Fisk and Ph Hofmann ... (14 authors)

Published 09/02/2024

Nature communications, 15, 1, 7621 - 7

Homogeneous mixed-valence (MV) behaviour is one of the most intriguing phenomena of f -electron systems. Despite extensive efforts, a fundamental aspect which remains unsettled is the experimental determination of the limiting cases for which MV emerges. Here we address this question for SmB 6 , a prototypical MV system characterized by two nearly-degenerate Sm 2+ and Sm 3+ configurations. By combining angle-resolved photoemission spectroscopy (ARPES) and x-ray absorption spectroscopy (XAS), we track the evolution of the mean Sm valence, v S m , in the Sm x La 1− x B 6 series. Upon substitution of Sm ions with trivalent La, we observe a linear decrease of valence fluctuations to an almost complete suppression at x = 0.2, with v S m ~ 2; surprisingly, by further reducing x , a re-entrant increase of v S m develops, approaching the value of v i m p ~ 2.35 in the dilute-impurity limit. Such behaviour departs from a monotonic evolution of v S m across the whole series, as well as from the expectation of its convergence to an integer value for x → 0. Our ARPES and XAS results, complemented by a phenomenological model, demonstrate an unconventional evolution of the MV character in the Sm x La 1− x B 6 series, paving the way to further theoretical and experimental considerations on the concept of MV itself, and its influence on the macroscopic properties of rare-earth compounds in the dilute-to-intermediate impurity regime. This study reveals a non-monotonic evolution of the mixed-valence character in the Sm x La 1− x B 6 series, with near-complete suppression of valence fluctuations in the intermediate substitution regime, followed by a re-emergent mixed-valence behavior in the dilute-impurity limit.

Priscila Rosa

Los Alamos National Laboratory

Output list