Pulsed Field Science Highlights
Smart Non-Linear Transport Technique Expands the Frontier of Superconductor Research
Superconductors conduct large amounts of electricity without losses. They are also used to create very large magnetic fields, for example in MRI machines, to study materials and medicine. Here, researchers developed a fast, new "smart" technique to measure how much current a superconductor can carry using very high pulsed magnetic fields.
Magnetoelectric coupling at a transition between two spin states
Materials with magnetoelectric coupling - a combination of magnetic and electric properties - have potential applications in low-power magnetic sensing, new computational devices and high-frequency electronics. Here, researchers find a new class of magnetoelectric materials controlled by spin state switching.
Record-Breaking Magnetoresistance measured in Natural Graphite
Researchers demonstrate a new record magnetoresistance in graphene by improving the contacting method, which helps improve our understanding of the material and can be useful in future sensors, compasses and other applications.
Extreme re-entrant superconductivity
Studies of uranium ditelluride in high magnetic fields show superconductivity switching off at 35 T, but reoccurring at higher magnetic fields between 40 and 65 T.
Emergent states of matter in chemically doped quantum magnets
Research on doped SrCu2(BO3)2 shows anomalies in the magnetization.
Spin-lattice and electron–phonon coupling in 3d/5d hybrid Sr3NiIrO6
In Sr3NiIrO6 vibrations in the crystal lattice (phonons) play an important role in its intriguing magnetic properties that result in a very high coercive field of 55 T. Using a combination of pulsed and DC magnetic fields coupled with magnetization and far-infrared spectroscopy, researchers were able to conclusively link the phonons to the magnetic behavior.
Unusual “Spin Liquid” quantum state found in TbInO3
Using intense pulsed magnetic fields and measurements at low temperatures, MagLab users have found evidence of a long-sought “spin liquid” in terbium indium oxide (TbInO3)
In-House Fabrication of Outsert Coil 1 for the 100T Pulsed Magnet
Pulsed magnets are designed to operate near their structural limits to be able to generate extremely high magnetic fields. The coils have a limited life expectancy and thus need to be replaced on occasion. Fabrication of these large coils are now being done at the MagLab where advanced nondestructive examinations can be performed. Because of more rigorous quality controls and improvements in high-strength conductors and reinforcement materials, the lifetime of these coils can be extended.
Destruction of Weyl nodes and a new state in tantalum arsenide above 80 teslas
Weyl metals such as tantalum arsenide (TaAs) are predicted to have novel properties arising from a chirality of their electron spins. Scientists induced an imbalance between the left- and right-handed spin states, resulting in a topologically protected current. This was the first time this phenomenon, known as the chiral anomaly, has been observed.
Phase diagram of URu2–xFexSi2 in high magnetic fields
Scientists used high magnetic fields and low temperatures to study crystals of URu2–xFexSi2. Using these conditions, they explored an intriguing state of matter called the "hidden order phase" that exhibits emergent behavior. Emergent behavior occurs when the whole is greater than the sum of its parts, meaning the whole has exciting properties that its parts do not possess; it is an important concept in philosophy, the brain and theories of life. This data provide strict constraints on theories of emergent behavior.
Exciton states in a new monolayer semiconductor
Analogous to the unique spectral fingerprint of any atom or molecule, researchers have measured the spectrum of optical excitations in monolayer tungsten diselenide (WSe2), which is a member of a new family of ultrathin semiconductors that are just one atomic layer thick.
New magnetic topological semimetal has energy-saving potential
Researchers discover that Sr1-yMn1-zSb2 (y,z < 0.1) is a so-called Weyl material that holds great promise for building devices that require far less power.
Selective mass enhancement close to a quantum critical point
This finding sheds light on the role of quasiparticle mass enhancement near a quantum critical point in one of the leading families of high-temperature superconductors.
Connection between superconductivity and insulator-metal transition
The finding in fullerides opens a new way of exploring the role electron interactions play in high-temperature superconductivity
Tunable, 2D semiconductors could be tomorrow's nano-sensors
Scientists discovered how to tune the optical properties of atomically-thin semiconductors, which will aid the design of future microscopic light sensors.
New technique for identifying Weyl materials
The work gives physicists a new tool for exploring and understanding a class of materials that could lead to faster electronics.
Upper critical field of iron-based superconductor discovered
Scientists discovered how strong of a magnetic field was necessary to suppress superconductivity in a thin film of iron-selenium.
New properties revealed in atomically-thin semiconductors
Scientists begin to fill in the blanks on transition metal dichalcogenides.
Colossal magnetoelectric coupling probed to 90 teslas
Ni3TeO6 provides a new approach to coupling magnetism to ferroelectricity with a record large response. We measured this material's magnetic and electric properties across an extended range of temperature and magnetic field and compared with theoretical calculations to extract a model that describes the underlying reason for a large magnetoelectric coupling. High magnetic fields were key to establishing the magnetic Hamiltonian. This work is motivating the discovery of further 3d-4d oxide materials with large magnetoelectric couplings.
Quasiparticle mass enhancement approaching optimal doping in a high-Tc superconductor
Using magnetic fields of over 90 T, the effective mass in the high-Tc superconductor YBa2Cu3O6+x was shown to be strongly enhanced as the material is doped toward optimal Tc.
