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Search Publications by: Nicholas Butch (Fed)

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Displaying 1 - 25 of 96

Pair Wave Function Symmetry in UTe2 from Zero-Energy Surface State Visualization

May 29, 2025
Author(s)
Qiangqiang Gu, Shuqiu Wang, Joseph Carroll, Kuanysh Zhussupbekov, Christopher Broyles, Sheng Ran, Nicholas Butch, Jarryd Horn, Shanta Saha, Johnpierre Paglione, Xiaolong Liu, J. Davis, Dung-Hai Lee
Although nodal spin-triplet topological superconductivity appears probable in uranium ditelluride (UTe2), its superconductive order parameter Δk remains unestablished. In theory, a distinctive identifier would be the existence of a superconductive

Robust Nodal Behavior in the Thermal Conductivity of Superconducting UTe2

April 25, 2025
Author(s)
Ian Hayes, Tristin E. Metz, Corey Frank, Shanta R. Saha, Nicholas Butch, Vivek Mishra, P. Hirschfeld, Johnpierre Paglione
The superconducting state of the heavy-fermion metal UTe2 has attracted considerable interest because of evidence of spin-triplet Cooper pairing and nontrivial topology. Progress on these questions requires identifying the presence or absence of nodes in

Odd-Parity Quasiparticle Interference in the Superconductive Surface State of UTe2

March 22, 2025
Author(s)
Shuqiu Wang, Kuanysh Zhussupbekov, Joseph Carroll, Bin Hu, Xiaolong Liu, Emile Pangburn, Adeline Crepieux, Cathrine Pepin, Christopher Broyles, Sheng Ran, Nicholas Butch, Shanta Saha, Johnpierre Paglione, Cristina Bena, J. Davis, Qiangqiang Gu
Although no known material exhibits intrinsic topological superconductivity, wherein spin-triplet odd-parity electron pairing occurs, UTe2 is now the leading representative of this class. Conventionally, the parity of the superconducting order parameter

Tuning a magnetic energy scale with pressure and field in UTe2

January 8, 2025
Author(s)
Hyunsoo Kim, I-Lin Liu, Wen-Chen Lin, Yun Eo, Sheng Ran, Nicholas Butch, Johnpierre Paglione
When a fragile ordered state is suppressed to zero temperature, a quantum phase transition occurs, which is often marked by the appearance of unconventional superconductivity. While the quantum critical point can be hidden, the influence of the quantum

Connection between f-electron correlations and magnetic excitations in UTe2

January 4, 2025
Author(s)
Thomas Halloran, Peter Czajka, Gicela Saucedo Salas, Corey Frank, Jose Rodriguez Rivera, Daniel Mazzonne, Jakob Lass, Nicholas Butch
Abstract The detailed anisotropic dispersion of the low-temperature, low-energy magnetic excitations of the candidate spin-triplet superconductor UTe 2 is revealed using inelastic neutron scattering. The magnetic excitations emerge from the Brillouin zone

Synthesis and Characterization of the Novel Breathing Pyrochlore Compound Ba3Tm2Zn5O11

December 6, 2024
Author(s)
Lalit Yadav, Rabindranath Bag, Ramesh Dhakal, Stephen Winter, Jeffrey Rau, Alexander Kolesnikov, Andrey Podlesnyak, Craig Brown, Nicholas Butch, David Graf, Michel Gingras, Sara Haravifard
In this study, a novel material from the rare-earth based breathing pyrochlore family, Ba3Tm2Zn5O11, was successfully synthesized. Powder x-ray diffraction and high-resolution powder neutron diffraction confirmed phase purity and the F ¯43m breathing

Field-Angle Evolution of the Superconducting and Magnetic Phases of UTe2 around the b Axis

November 27, 2024
Author(s)
Sylvia Lewin, Josephine Yu, Corey Frank, David Graf, Patrick Chen, Sheng Ran, Yun Eo, Johnpierre Paglione, S. Raghu, Nicholas Butch
We experimentally determine the bounds of the magnetic-field-induced superconducting and magnetic phases near the crystalline b axis of uranium ditelluride (UTe2). By measuring the magnetoresistance as a function of rotation angle and field strength in

Itinerant A-Type Antiferromagnet Order in Co1/4TaSe2

October 11, 2024
Author(s)
H. C. Mandujano, Gicela Saucedo Salas, Tianyu Li, Peter Zavalij, Alicia Manjon-Sanz, Nicholas Butch, Efrain Rodriguez
We present the magnetic behavior and resulting transport properties of TaSe2 when intercalated by magnetically active cobalt cations. Acting as the layered host, TaSe2 is a transition metal dichalcogenide (TMD) that adopts the 2H-polytype. We find through

Absence of a Bulk Signature of a Charge Density Wave in Hard X-ray Measurements of UTe2

October 9, 2024
Author(s)
Caitlin Kengle, Dipanjan Chaudhuri, Xuefei Guo, Thomas Johnson, Simon Bettler, Wolfgang Simeth, Matthew Krogstad, Zahir Islam, Sheng Ran, Shanta Saha, Johnpierre Paglione, Nicholas Butch, Eduardo Fradkin, Vidya Madhavan, Peter Abbamonte
The long-sought pair density wave (PDW) is an exotic phase of matter in which charge density wave (CDW) order is intertwined with the amplitude or phase of coexisting, superconducting order. Originally predicted to exist in copper-oxides, circumstantial

Absence of a Bulk Thermodynamic Phase Transition to a Density Wave Phase in UTe2

October 9, 2024
Author(s)
Florian Theuss, Avi Shragai, Gael Grissonnanche, Luciano Peralta, Gregorio de la Fuente Simarro, Ian Hayes, Shanta Saha, Yun Eo, Alonso Suarez, Andrea Capa Salinas, Ganesh Pokharel, Stephen Wilson, Nicholas Butch, Johnpierre Paglione, B. Ramshaw
Competing and intertwined orders are ubiquitous in strongly correlated electron systems, such as the charge, spin, and superconducting orders in the high-Tc cuprates. Recent scanning tunneling microscopy (STM) measurements provide evidence for a charge

Single-Component Superconductivity in UTe2 at Ambient Pressure

July 1, 2024
Author(s)
Florian Theuss, Avi Shragai, Gael Grissonnanche, Ian Hayes, Shanta Saha, Yun Eo, Alonso Suarez, Tatsuya Shishidou, Nicholas Butch, Johnpierre Paglione, B. Ramshaw
The microscopic mechanism of Cooper pairing in a superconductor leaves its fingerprint on the symmetry of the order parameter. UTe2 has previously been inferred to have a multi-component order parameter, in part due to the apparent presence of a two-step

Inelastic Neutron Scattering Study of Field Dependence of Magnetic Excitations in CoTiO3

May 28, 2024
Author(s)
Bo Yuan, Ezekiel Horsley, M. B. Stone, Nicholas Butch, Guangyong Xu, Guo-Jiun Shu, J. P. Clancy, Young-June Kim
We report field-dependent high-resolution inelastic neutron scattering (INS) measurements on the honeycomb lattice magnet, CoTiO3, to study the evolution of its magnon excitations across a spin reorientation transition driven by an in-plane magnetic field

Inhomogeneous High Temperature Melting and Decoupling of Charge Denisty Waves in Spin-Triplet Superconductor UTe2

May 25, 2024
Author(s)
Alexander LaFleur, Hong Li, Corey Frank, Muxian Xu, Siyu Cheng, Ziqiang Wang, Nicholas Butch, Ilija Zeljkovic
Charge, spin and Cooper-pair density waves have now been widely detected in exotic superconductors. Understanding how these density waves emerge — and become suppressed by external parameters—is a key research direction in condensedmatter physics. Here we

Skyrmion Lattice Formation and Destruction Mechanisms Probed with TR-SANS

April 30, 2024
Author(s)
W. L. N. C. Liyanage, Nan Tang, Rebecca Dally, Lizabeth J. Quigley, C. Buchanan, Guo-Jiun Shu, Nicholas Butch, Kathryn Krycka, Markus Bleuel, Julie A. Borchers, Debeer-Schmitt Lisa, Dustin Gilbert
Magnetic skyrmions are topologically protected, nanoscale whirls of the spin configuration that tend to form hexagonally ordered arrays. As a topologically non-trivial structure, the nucleation and annihilation of the skyrmion, as well as the interaction

Orphan high field superconductivity in non-superconducting uranium ditelluride.

April 20, 2024
Author(s)
Corey Frank, Sylvia Lewin, Gicela Saucedo Salas, Peter Czajka, Ian Hayes, Hyeok Yoon, Tristin Metz, Johnpierre Paglione, John Singleton, Nicholas Butch
Reentrant superconductivity is an uncommon phenomenon in which the destructive effects of magnetic field on superconductivity are mitigated, allowing a zero-resistance state to survive under conditions that would otherwise destroy it. Typically, the

Orphan High Field Superconductivity in Non-Superconducting Uranium Ditelluride

April 19, 2024
Author(s)
Corey Frank, Sylvia Lewin, Gicela Saucedo Salas, Peter Czajka, Ian Hayes, Hyeok Yoon, Tristin Metz, Johnpierre Paglione, John Singleton, Nicholas Butch
Reentrant superconductivity is an uncommon phenomenon in which the destructive effects of magnetic field on superconductivity are mitigated, allowing a zero-resistance state to survive under conditions that would otherwise destroy it. Typically, the

Resonant Ultrasound Spectroscopy for Irregularly Shaped Samples and Its Application to Uranium Ditelluride

February 9, 2024
Author(s)
Florian Theuss, Gregorio de la Fuente Simarro, Avi Shragai, Gael Grissonnanche, Ian Hayes, Shanta Saha, Tatsuya Shishidou, Taishi Chen, Satoru Nakatsuji, Sheng Ran, Michael Weinert, Nicholas Butch, Johnpierre Paglione, B. Ramshaw
Resonant ultrasound spectroscopy (RUS) is a powerful technique for measuring the full elastic tensor of a given material in a single experiment. Previously, this technique was limited to regularly-shaped samples such as rectangular parallelepipeds, spheres

Charge Order Evolution of Superconducting BaNi2As2 Under High Pressure

November 2, 2023
Author(s)
John Collini, Daniel Campbell, Daniel Sneed, Prathum Saraf, Christoper Eckberg, Jason Jeffries, Nicholas Butch, Johnpierre Paglione
BaNi2As2, a nonmagnetic superconductor counterpart to BaFe2As2, has been shown to develop nematic order, multiple charge orders, and a dramatic sixfold enhancement of superconductivity via isovalent chemical substitution of Sr for Ba. Here we present high

A Review of UTe2 at High Magnetic Fields

November 1, 2023
Author(s)
Sylvia Lewin, Corey Frank, Sheng Ran, Johnpierre Paglione, Nicholas Butch
ranium ditelluride (UTe2) is recognized as a host material to unconventional spin-triplet superconductivity, but it also exhibits a wealth of additional unusual behavior at high magnetic fields. One of the most prominent signatures of the unconventional

Single-Component Superconductivity in UTe2 at Ambient Pressure

July 21, 2023
Author(s)
Florian Theuss, Avi Shragai, Gael Grissonnanche, Ian Hayes, Shanta Saha, Yun Eo, Alonso Suaraz, Tatsuya Shishidou, Nicholas Butch, Johnpierre Paglione, B. Ramshaw
The microscopic mechanism of Cooper pairing in a superconductor leaves its fingerprint on the symmetry of the order parameter. UTe2 has been inferred to have a multi-component order parameter that entails exotic effects like time reversal symmetry breaking

Detection of a Pair Density Wavestate in UTe2

June 28, 2023
Author(s)
Qiangqiang Gu, Joseph Carroll, Shuqiu Wang, Sheng Ran, Christopher Broyles, Hasan Siddiquee, Nicholas Butch, Shanta Saha, Johnpierre Paglione, J. Davis, Xiaolong Liu

Melting of the Charge Density Wave by Generation of Pairs of Topological Defects in UTe2

June 14, 2023
Author(s)
Anuva Aishwarya, Julian May-Mann, Avior Almoalem, Sheng Ran, Shanta Saha, Johnpierre Paglione, Nicholas Butch, Eduardo Fradkin, Vidya Madhavan
Topological defects are singularities in an ordered phase that can have a profound effect on phase transitions and serve as a window into the order parameter. Examples of topological defects include dislocations in charge density waves and vortices in a

Ubiquitous Spin Freezing in the Superconducting State of UTe2

February 1, 2023
Author(s)
Shyam Sundar, Nasrin Azari, Mariah Goeks, Shayan Gheidi, Mae Abedi, Michael Yakovlev, Sarah Dunsiger, John Wilkinson, Stephen Blundell, Tristin Metz, Ian Hayes, Shanta Saha, Sangyun Lee, Andrew Woods, Roman Movshovich, Sean Thomas, Nicholas Butch, Priscila Rosa, Johnpierre Paglione, Jeff Sonier
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