A5079405764- Rare-earth and actinide compounds
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Radioactive element chemistry and processing
- Quantum many-body systems
- Theoretical and Computational Physics
- Topological Materials and Phenomena
- Inorganic Chemistry and Materials
- Catalysis and Oxidation Reactions
- Nuclear Materials and Properties
- Advanced Chemical Physics Studies
- Advanced Physical and Chemical Molecular Interactions
University of Cambridge
2023-2025
The heavy fermion paramagnet UTe
The unconventional superconductor UTe <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msub> <mml:mrow/> <mml:mn>2</mml:mn> </mml:msub> </mml:math> exhibits numerous signatures of spin-triplet superconductivity—a rare state matter which could enable quantum computation protected against decoherence. possesses a complex phase landscape comprising two magnetic field-induced superconducting phases, metamagnetic transition to field-polarized...
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mtext>UTe</a:mtext><a:mn>2</a:mn></a:msub></a:math> is a spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, enabling quantum oscillation measurements to probe its Fermi surface and effective carrier masses. It has been reported that <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Below a critical temperature <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:msub> <mml:mi>T</mml:mi> <mml:mi>c</mml:mi> </mml:msub> </mml:math> , superconductors transport electrical charge without dissipative energy losses. The application of magnetic field <mml:mi>B</mml:mi> generally acts to suppress up some strength at which <mml:mrow> <mml:mo stretchy="false">→</mml:mo> </mml:mrow> 0 K. Here, we investigate field–induced...
The metallic oxide RuO$_2$ had emerged as a promising altermagnet candidate, owing to reports of this material hosting antiferromagnetic ordering accompanied by spin-split electronic band structure characteristic time-reversal symmetry-breaking. However, recent studies have robustly questioned orthodoxy. In particular, surface-sensitive probes detected unusual surface states that may exhibit several characteristics expected for an altermagnet, challenging the determination intrinsic magnetic...
Quantum critical phenomena are widely studied across various materials families, from high-temperature superconductors to magnetic insulators. They occur when a thermodynamic phase transition is suppressed zero temperature as function of some tuning parameter such pressure or field. This generally yields point instability—a so-called quantum point—at which the driven exclusively by fluctuations. Here, we show that heavy fermion metamagnet <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
The spin-triplet superconductor UTe$_2$ exhibits a myriad of exotic physical phenomena, including the possession three distinct superconducting phases at ambient pressure for magnetic field $\mu_0 H \leq$ 40~T aligned in certain orientations. However, contradictory reports between studies performed on specimens varying quality have severely impeded theoretical efforts to understand microscopic properties this material. Here, we report high measurements new generation ultraclean crystals...
The phase landscape of UTe$_2$ features a remarkable diversity superconducting phases under applied pressure and magnetic field. Recent quantum oscillation studies at ambient have revealed the quasi-2D Fermi surface this material. However, pressure-dependence remains an open question. Here we track evolution as function up to 19.5 kbar by measuring interference oscillations. We find that in sufficient field suppress both superconductivity low pressures incommensurate antiferromagnetism...
The heavy fermion material UTe$_2$ possesses a rich phase diagram with multiple superconducting phases, several of which exhibit characteristics odd-parity pairing. Here, we report on the pressure dependence signatures transition in temperature dependent ac magnetic susceptibility $\chi(T)$ high quality single crystals. We resolve at low pressures $<$ 0.3 GPa. At higher pressure, however, second feature emerges $\chi(T)$, is located thermodynamic boundary between two separate states...
The heavy fermion paramagnet UTe$_2$ exhibits numerous characteristics of spin-triplet superconductivity. Efforts to understand the microscopic details this exotic superconductivity have been impeded by uncertainty regarding underlying electronic structure. Here we directly probe Fermi surface measuring magnetic quantum oscillations in pristine quality crystals. We find an angular profile oscillatory frequency and amplitude that is characteristic a quasi-2D surface, which well described two...
Quantum critical phase boundaries (QCPBs) -- where a continuous transition occurs at zero temperature have been found to nucleate novel electronic states in number of strongly correlated materials. Emergent phases, such as unconventional superconductivity, frequently occur close proximity QCPB. However, the antagonism between magnetic field and superconductivity generally suppresses superconductive phases modest ranges, except notable cases high-$T_\text{c}$ cuprates. Here we show that heavy...
UTe$_2$ is a promising spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, thereby enabling quantum oscillation measurements to probe the Fermi surface of this material. The dimensionality sections triplet can important implications regarding topological properties superconductivity. For example, has been proposed possess chiral superconducting order parameter, could result in formation topologically protected...