Article
Materials Science, Multidisciplinary
K. Willa, R. Willa, F. Hardy, L. Wang, P. Schweiss, T. Wolf, C. Meingast
Summary: In this study, the influence of magnetic fields on the superconductivity and magnetostructural transition in Ba1-xKxFe2As2 was investigated. The results showed that the magnetic field suppresses the reentrance of the orthorhombic phase, indicating that the weakening of the superconducting order is the main cause.
Article
Multidisciplinary Sciences
Ye Yang, Fanghang Yu, Xikai Wen, Zhigang Gui, Yuqing Zhang, Fangyang Zhan, Rui Wang, Jianjun Ying, Xianhui Chen
Summary: Based on electrical transport and XRD measurements, as well as first-principles calculations, researchers discover a unique pressure-induced Mott transition from an antiferromagnetic Mott insulator to a ferromagnetic Weyl metal in the iron oxychalcogenide La2O3Fe2Se2 around 37 GPa without any structural change. The theoretical calculations indicate that this insulator-metal transition is mainly due to the increased bandwidth and reduced electron correlation under high pressure. Moreover, the high-pressure ferromagnetic Weyl metallic phase exhibits attractive electronic band structures with six pairs of Weyl points near the Fermi level, which can be easily manipulated by a magnetic field.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ashini S. Jayasinghe, You Lai, Wesley M. Potter, Cory J. Windorff, Ryan Baumbach, Thomas E. Albrecht-Schoenzart, Susan E. Latturner
Summary: The use of aluminum/gallium melts as a solvent and reducing agent in the synthesis of An(1.33)T(4)Al(8)Si(2) compounds was crucial in this study. Reactions with T = Co yielded hexagonal Gd1.33Fe4Si10-type quaternary phases for all An while reactions with T = Ni only produced these compounds with An = U and Np. Attempts to synthesize plutonium analogues were unsuccessful.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Dylan Bardgett, Renae N. Gannon, Danielle M. Hamann, Dennice M. Roberts, Sage R. Bauers, Ping Lu, David C. Johnson
Summary: The study investigated the phase formation sequence and crystal growth of binary Fe-Se compounds through preparing a series of Fe-Se ultrathin diffusion couples. It was found that the phase formation sequence at higher temperatures is governed by Se loss in the annealing process, consistent with what would be expected from the phase diagram. Additionally, films rich in Fe were crystallized during deposition providing a means to crystallographically aligned, iron-rich beta-FeSe for future research.
CHEMISTRY OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
M. Xu, J. Schmidt, M. A. Tanatar, R. Prozorov, S. L. Bud'ko, P. C. Canfield
Summary: Members of the CaK(Fe1-xCrx)(4)As-4 series were synthesized and characterized. The superconducting transition temperature decreases and magnetic transition appears with increasing Cr substitution. A temperature-composition (T-x) phase diagram is constructed, revealing a half-dome of superconductivity with the magnetic transition temperature rising as Cr substitution increases. The superconductivity of CaK(Fe1-xCrx)(4)As-4 is also studied as a function of magnetic field, showing changes related to Fermi surface changes associated with the magnetic ordering.
Article
Physics, Multidisciplinary
Jong Hyuk Kim, Mi Kyung Kim, Jae Min Hong, Hyun Jun Shin, Ki Won Jeong, Jin Seok Kim, Kyungsun Moon, Nara Lee, Young Jai Choi
Summary: In this study, the magnetic anisotropy of the non-collinear antiferromagnet EuCo2As2 was investigated using torque magnetometry and an easy-plane anisotropic model. The detailed spin configurations that evolve in the presence of rotating magnetic fields were visualized, providing an in-depth understanding of the anisotropic properties of noncollinear-type antiferromagnets.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Physical
Hansung Kim, In Won Yeu, Gyuseung Han, Gunwu Ju, Yun Joong Lee, Young-hun Shin, Jung-Hae Choi, Hyun Cheol Koo, Hyung-jun Kim
Summary: The study found that the evolution of surface morphology and underlying pyramidal defects in homoepitaxial GaAs (110) layers is closely related to the layer thickness and growth temperature, resulting in the formation of different shapes of three-dimensional surface islands, including triangular islands and starfish shapes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Fabian Grahlow, Eric Dorsch, Markus Stroebele, Carl P. Romao, Hans-Juergen Meyer
Summary: The synthesis of the previously undiscovered binary sulfide Nb4S3 using Nb3Br7S precursor has revealed it to be a polar metal, with metallic bands primarily occupied by electrons of niobium character. The unscreened electrostatic interactions between sulfur atoms in Nb4S3 allow for the coexistence of polarity and metallicity. These findings suggest that applied electric fields could potentially reverse the polarity of Nb4S3 thin films.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
M. Xu, J. Schmidt, E. Gati, L. Xiang, W. R. Meier, V. G. Kogan, S. L. Bud'ko, P. C. Canfield
Summary: In this study, the effects of Mn substitution on the superconducting and magnetic ground state of CaKFe4As4 were investigated. It was found that Mn substitution decreases the superconducting transition temperature and induces a magnetic transition. A temperature-composition phase diagram was constructed, and the influence of Mn substitution on the elastoresistivity and superconductivity under a magnetic field was also studied.
Article
Materials Science, Multidisciplinary
M. G. Kim, W. Ratcliff, D. M. Pajerowski, J-W Kim, J-Q Yan, J. W. Lynn, A. Goldman, A. Kreyssig
Summary: The magnetic ordering and structural distortion in PrFeAsO crystals, the basis compound for oxypnictide superconductors, were studied using high-resolution x-ray diffraction, neutron diffraction, and x-ray resonant magnetic scattering. The results revealed the tetragonal-to-orthorhombic phase transition, antiferromagnetic phase transitions of Fe and Pr moments at specific temperatures. The magnetic moments of Pr were found to align along the longer orthorhombic axis and order antiferromagnetically along the a axis, while showing ferromagnetic ordering along the b and c directions, indicating no reorientation of moments.
Article
Materials Science, Multidisciplinary
M. L. Amigo, Q. Stahl, A. Maljuk, A. U. B. Wolter, C. Hess, J. Geck, S. Wurmehl, S. Seiro, B. Buechner
Summary: BaFe2S3 is a quasi-one-dimensional antiferromagnetic insulator that becomes superconducting under hydrostatic pressure. The Fe content has been found to play a decisive role in optimizing the magnetic ordering temperature and superconducting properties. However, an excess of Fe may lead to the presence of magnetic secondary phases. Magnetic ordering temperature and resistivity anomaly temperature seem to correlate with the level of disorder in the samples rather than with the value of Fe excess delta.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Santanu Pakhira, M. A. Tanatar, Thomas Heitmann, David Vaknin, D. C. Johnston
Summary: The compound EuSn2As2 exhibits Dirac surface states and antiferromagnetism. The magnetic ground state is a collinear A-type antiferromagnetic structure, with strong magnetic scattering observed.
Article
Materials Science, Multidisciplinary
Klaus Zollner, Jaroslav Fabian
Summary: Van der Waals heterostructures incorporating bilayer graphene within WS2 or CGT layers were studied, revealing the tunability of electronic spin properties through adjustments in twist angles and magnetization directions. Effective models based on fit parameters of model Hamiltonians were used to investigate the behavior under different configurations, providing insights for potential applications in spin transport and relaxation studies.
Article
Chemistry, Physical
Chi Ho Wong, Rolf Lortz
Summary: In this study, we computed the superconducting transition temperature (Tc) of iron-based superconductors using two existing models and tested their validity for predicting the Tc of FeSe monolayers. Our results show that the model, which takes into account the amplifying effect of antiferromagnetism and electron-phonon coupling, agrees well with experimental data. Furthermore, we found that interfacial effects may contribute to the observed Tc enhancement in FeSe monolayers.
Article
Physics, Applied
T. Kobayashi, H. Ogawa, F. Nabeshima, A. Maeda
Summary: In this study, FeSe/STO films with a thickness of 5-30 nm were fabricated using pulsed laser deposition (PLD) technique. The grown films exhibit superconductivity with a higher onset Tc compared to bulk FeSe. The observed Tc values increase as the film thickness decreases, except for films thinner than 10 nm. These results indicate the realization of interface superconductivity in PLD-grown FeSe/STO.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Condensed Matter
Florian Wasser, Sabine Wurmehl, Saicharan Aswartham, Yvan Sidis, J. T. Park, Astrid Schneidewind, Bernd Buechner, Markus Braden
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2017)
Article
Multidisciplinary Sciences
Bingying Pan, Yao Shen, Die Hu, Yu Feng, J. T. Park, A. D. Christianson, Qisi Wang, Yiqing Hao, Hongliang Wo, Zhiping Yin, T. A. Maier, Jun Zhao
NATURE COMMUNICATIONS
(2017)
Article
Chemistry, Physical
Tong Chen, Youzhe Chen, Andreas Kreisel, Xingye Lu, Astrid Schneidewind, Yiming Qiu, J. T. Park, Toby G. Perring, J. Ross Stewart, Huibo Cao, Rui Zhang, Yu Li, Yan Rong, Yuan Wei, Brian M. Andersen, P. J. Hirschfeld, Collin Broholm, Pengcheng Dai
Article
Physics, Multidisciplinary
Masato Matsuura, Takahiko Sasaki, Satoshi Iguchi, Elena Gati, Jens Mueller, Oliver Stockert, Andrea Piovano, Martin Bohm, Jitae T. Park, Sananda Biswas, Stephen M. Winter, Roser Valenti, Akiko Nakao, Michael Lang
PHYSICAL REVIEW LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Jin Yeong Kim, Jaewoo Park, Junsu Ha, Minji Jung, Dirk Wallacher, Alexandra Franz, Rafael Balderas-Xicohtencatl, Michael Hirscher, Sung Gu Kang, Jitae T. Park, In Hwan Oh, Hoi Ri Moon, Hyunchul Oh
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Chemistry, Multidisciplinary
Minji Jung, Jaewoo Park, Raeesh Muhammad, Jin Yeong Kim, Veronika Grzimek, Margarita Russina, Hoi Ri Moon, Jitae T. Park, Hyunchul Oh
Summary: Kinetic-quantum-sieving-assisted H-2:D-2 separation in flexible porous materials is more effective than traditional methods like cryogenic distillation. Experimental observation shows significantly faster diffusion of deuterium compared to hydrogen in flexible pore structures, suggesting a new strategy for efficient isotope separation at higher temperatures. Further research is needed to explore this area in more depth.
ADVANCED MATERIALS
(2021)
Article
Physics, Condensed Matter
Die Hu, Yu Feng, Jitae T. Park, Hongliang Wo, Qisi Wang, Frederic Bourdarot, Alexandre Ivanov, Jun Zhao
Summary: In this study, polarized neutron scattering measurements were conducted on the low energy spin fluctuations of the iron-selenide superconductor Li0.8Fe0.2ODFeSe both below and above its superconducting transition temperature of T(c) = 41 K. The experiments confirmed the magnetic resonance mode near 21 meV, and found that the spin excitations were isotropic in spin space at 5 <= E, <= 29 meV in both the superconducting and normal states. The results suggest that the resonance mode in iron-based superconductors becomes isotropic when the effects of spin-orbit coupling and magnetic/nematic order are minimized, similar to what is observed in cuprate superconductors.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Multidisciplinary Sciences
Fengfeng Zhu, Lichuan Zhang, Xiao Wang, Flaviano Jose dos Santos, Junda Song, Thomas Mueller, Karin Schmalzl, Wolfgang F. Schmidt, Alexandre Ivanov, Jitae T. Park, Jianhui Xu, Jie Ma, Samir Lounis, Stefan Bluegel, Yuriy Mokrousov, Yixi Su, Thomas Brueckel
Summary: The study reports the realization of topological magnon insulators in CrXTe3 compounds, confirming the nontrivial nature of gap opening at the magnon band-crossing Dirac points and the emergence of corresponding in-gap topological edge states. This class of remarkable 2D materials is expected to lead to new technological applications in magnonics and topological spintronics.
Article
Physics, Multidisciplinary
Dongliang Gong, Ming Yi, Meng Wang, Tao Xie, Wenliang Zhang, Sergey Danilkin, Guochu Deng, Xinzhi Liu, Jitae T. Park, Kazuhiko Ikeuchi, Kazuya Kamazawa, Sung-Kwan Mo, Makoto Hashimoto, Donghui Lu, Rui Zhang, Pengcheng Dai, Robert J. Birgeneau, Shiliang Li, Huiqian Luo
Summary: This study presents a comprehensive investigation on the nematic fluctuations in a non-superconducting iron pnictide system, revealing the crucial role of the interplay between local spins and itinerant electrons on Fermi surfaces. The results indicate that the in-plane resistivity anisotropy highly depends on the Cr dopings and the type of charge carriers, and the orbital degree of freedom may behave differently from the spin degree of freedom.
FRONTIERS IN PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
A. S. Sukhanov, Y. V. Tymoshenko, A. A. Kulbakov, A. S. Cameron, V. Kocsis, H. C. Walker, A. Ivanov, J. T. Park, V. Pomjakushin, S. E. Nikitin, I. V. Morozov, I. O. Chernyavskii, S. Aswartham, A. U. B. Wolter, A. Yaresko, B. Buechner, D. S. Inosov
Summary: FeP is a special material with complex noncollinear spin order. By measuring the spin-excitation spectra, we found that the magnons in FeP have strong anisotropic dispersions. The dominant antiferromagnetic interactions between rigid ferromagnetic spin chains drive the magnetic frustration in FeP.
Article
Multidisciplinary Sciences
Panpan Liu, Mason L. Klemm, Long Tian, Xingye Lu, Yu Song, David W. Tam, Karin Schmalzl, J. T. Park, Yu Li, Guotai Tan, Yixi Su, Frederic Bourdarot, Yang Zhao, Jeffery W. Lynn, Robert J. Birgeneau, Pengcheng Dai
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Florian Wasser, Jitae T. Park, Saicharan Aswartham, Sabine Wurmehl, Yvan Sidis, Paul Steffens, Karin Schmalzl, Bernd Buechner, Markus Braden
NPJ QUANTUM MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
E. S. Klyushina, B. Lake, A. T. M. N. Islam, J. T. Park, A. Schneidewind, T. Guidi, E. A. Goremychkin, B. Klemke, M. Mansson
Article
Materials Science, Multidisciplinary
Haoran Man, Rui Zhang, J. T. Park, Xingye Lu, J. Kulda, A. Ivanov, Pengcheng Dai
Article
Materials Science, Multidisciplinary
E. S. Klyushina, A. T. M. N. Islam, J. T. Park, E. A. Goremychkin, E. Wheeler, B. Klemke, B. Lake
