Article
Materials Science, Multidisciplinary
Changming Yue, Shintaro Hoshino, Akihisa Koga, Philipp Werner
Summary: The study found that local orbital fluctuations are significantly enhanced in the superconducting state of A(3)C(60) fulleride superconductors, providing the pairing glue and supporting the spin/orbital freezing theory of unconventional superconductivity. Additionally, the results are consistent with the experimentally observed universal relation between the gap energy and local susceptibility in a wide range of unconventional superconductors.
Article
Physics, Multidisciplinary
Amrit Raj Pokharel, Vladimir Grigorev, Arjan Mejas, Tao Dong, Amir A. Haghighirad, Rolf Heid, Yi Yao, Michael Merz, Matthieu Le Tacon, Jure Demsar
Summary: BaNi2As2, a non-magnetic analogue, exhibits an unconventional charge-density-wave (CDW) order and competes with superconductivity. Time-resolved optical spectroscopy reveals the existence of several CDW amplitude modes and their exceptional resilience against perturbations. This study provides important insights into the electronic instability mechanism of non-magnetic pnictides.
COMMUNICATIONS PHYSICS
(2022)
Article
Multidisciplinary Sciences
R. Fittipaldi, R. Hartmann, M. T. Mercaldo, S. Komori, A. Bjorlig, W. Kyung, Y. Yasui, T. Miyoshi, L. A. B. Olde Olthof, C. M. Palomares Garcia, V. Granata, I. Keren, W. Higemoto, A. Suter, T. Prokscha, A. Romano, C. Noce, C. Kim, Y. Maeno, E. Scheer, B. Kalisky, J. W. A. Robinson, M. Cuoco, Z. Salman, A. Vecchione, A. Di Bernardo
Summary: The study reveals the presence of unconventional magnetism at the surface of Sr2RuO4 in its normal state, attributed to orbital loop currents forming at the reconstructed surface, which can potentially influence electron pairing with broken time reversal symmetry.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
A. Nag, A. Nocera, S. Agrestini, M. Garcia-Fernandez, A. C. Walters, Sang-Wook Cheong, S. Johnston, Ke-Jin Zhou
Summary: This study unveils the hidden quadrupolar constituent in Y2BaNiO5 and demonstrates its unique collective dispersion using Ni L-3-edge resonant inelastic x-ray scattering.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Yu-Te Hsu, Mate Hartstein, Alexander J. Davies, Alexander J. Hickey, Mun K. Chan, Juan Porras, Toshinao Loew, Sofia Taylor, Hsu Liu, Alexander G. Eaton, Matthieu Le Tacon, Huakun Zuo, Jinhua Wang, Zengwei Zhu, Gilbert G. Lonzarich, Bernhard Keimer, Neil Harrison, Suchitra E. Sebastian
Summary: A study on ultrapure single crystals of underdoped YBa2Cu3O6+x reveals an unconventional quantum vortex matter ground state with characteristics such as vanishing electrical resistivity, magnetic hysteresis, and nonohmic electrical transport. This requires a new model of the pseudogap ground state to explain the quantum oscillations hosted by the bulk quantum vortex matter state.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
D. Pelc, R. J. Spieker, Z. W. Anderson, M. J. Krogstad, N. Biniskos, N. G. Bielinski, B. Yu, T. Sasagawa, L. Chauviere, P. Dosanjh, R. Liang, D. A. Bonn, A. Damascelli, S. Chi, Y. Liu, R. Osborn, M. Greven
Summary: This research uncovers universal structural fluctuations in La2-xSrxCuO4 and Tl2Ba2CuO6+delta, two cuprate superconductors, and reveals their impact on macroscopic properties. These findings contribute to our understanding of the physics of cuprate superconductors.
SCIENTIFIC REPORTS
(2022)
Review
Physics, Multidisciplinary
Michael Smidman, Oliver Stockert, Emilian M. Nica, Yang Liu, Huiqiu Yuan, Qimiao Si, Frank Steglich
Summary: This Colloquium surveys apparently conflicting results from multiple experimental studies on the heavy-fermion metal CeCu2Si2. Different theoretical scenarios, including isotropic and anisotropic two-band s-wave superconductivity, as well as an effective two-band d-wave model, are addressed to understand the particular gap structure. Lessons learned from CeCu2Si2 are expected to contribute to uncovering Cooper-pair states in other unconventional, fully gapped superconductors with strongly correlated carriers.
REVIEWS OF MODERN PHYSICS
(2023)
Article
Multidisciplinary Sciences
Dorri Halbertal, Simon Turkel, Christopher J. Ciccarino, Jonas B. Hauck, Nathan Finney, Valerie Hsieh, Kenji Watanabe, Takashi Taniguchi, James Hone, Cory Dean, Prineha Narang, Abhay N. Pasupathy, Dante M. Kennes, D. N. Basov
Summary: The electronic and structural properties of atomically thin materials can be tuned by assembling them with an interlayer twist. In this study, the authors reveal surprising optical and electronic contrast in twisted double trilayer graphene and analyze the energetics of the unconventional lattice relaxation process. They demonstrate that this relaxation is non-local, leading to an energy gain in one domain of the moire lattice that is paid for by a relaxation in the other.
NATURE COMMUNICATIONS
(2022)
Review
Physics, Condensed Matter
D. Aoki, J-P Brison, J. Flouquet, K. Ishida, G. Knebel, Y. Tokunaga, Y. Yanase
Summary: This article reviews the recent experimental and theoretical progress on the novel spin-triplet superconductor UTe2 and discusses its rich phase diagrams, unconventional behaviors, and the interplay between its normal and superconducting properties in different conditions.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Engineering, Electrical & Electronic
Soumyadip Halder, Mona Garg, Nikhlesh Singh Mehta, Anamika Kumari, Rajesh Sharma, Tanmoy Das, Suvankar Chakraverty, Goutam Sheet
Summary: The conducting interfaces of perovskite oxides are important for various quantum phenomena and potential applications in superconducting nano-electronic devices. We discovered two-dimensional superconductivity below Tc approximately 250 mK at the interfaces between the Mott-insulator LaVO3 and the band-insulator SrTiO3. Our findings suggest the existence of an unconventional order parameter, supported by spectroscopic measurements of Andreev reflection.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
Yi Zhang, Kun Jiang, Fuchun Zhang, Jian Wang, Ziqiang Wang
Summary: Researchers propose a novel approach to achieve emergent quasi-one-dimensional TSCs in unconventional superconductors through naturally embedded quantum structures like atomic line defects. The mixed-parity spin pairing of neighboring electrons at the line defect results in nontrivial topological invariants, creating TSCs with robust Majorana zero modes.
Article
Physics, Multidisciplinary
Peng-Liang Leng, Xiang-Yu Cao, Qiang Ma, Lin-Feng Ai, Yu-Da Zhang, Jing-Lei Zhang, Fa-Xian Xiu
Summary: In this study, we observed an unconventional nonreciprocal voltage transition phenomenon in topological insulator Ag2Te nanobelts. This voltage transition increases from nearly zero to giant values under the influence of external magnetic fields, while remaining unchanged under different direct currents. We propose a possible explanation mechanism based on the development of edge channels.
CHINESE PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
C. D. Dashwood, A. H. Walker, M. P. Kwasigroch, L. S. I. Veiga, Q. Faure, J. G. Vale, D. G. Porter, P. Manuel, D. D. Khalyavin, F. Orlandi, C. V. Colin, O. Fabelo, F. Krueger, R. S. Perry, R. D. Johnson, A. G. Green, D. F. McMorrow
Summary: The transition in the layered-ruthenate material Ca3Ru2O7 is driven by a lattice strain that tunes the electronic bandwidth. External strain can stimulate the development of internal strain, lowering the electronic energy. These findings are important for understanding the driving force behind coupled phase transitions and controlling them.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Daniel Pecak, Tomasz Sowinski
Summary: This study investigates attractively interacting two-component mixtures of fermionic particles confined in a one-dimensional harmonic trap and systematically explores the properties of balanced and imbalanced systems with finite-temperature effects. Specific non-classical pairing correlations are analyzed using single- and two-particle density distributions, and it is shown that imbalanced systems gradually transition into a standard Bardeen-Cooper-Schrieffer system characterized by zero net momentum of resulting pairs.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Yu-Xiao Jiang, Jia-Xin Yin, M. Michael Denner, Nana Shumiya, Brenden R. Ortiz, Gang Xu, Zurab Guguchia, Junyi He, Md Shafayat Hossain, Xiaoxiong Liu, Jacob Ruff, Linus Kautzsch, Songtian S. Zhang, Guoqing Chang, Ilya Belopolski, Qi Zhang, Tyler A. Cochran, Daniel Multer, Maksim Litskevich, Zi-Jia Cheng, Xian P. Yang, Ziqiang Wang, Ronny Thomale, Titus Neupert, Stephen D. Wilson, M. Zahid Hasan
Summary: The study reveals an unconventional chiral charge order in KV3Sb5, a material with both a topological band structure and a superconducting ground state, using high-resolution scanning tunnelling microscopy. A 2 x 2 superlattice structure is observed in the experiment, along with an energy gap opening and charge modulation across the Fermi level.
Article
Materials Science, Multidisciplinary
Soon-Gil Jung, Duong Pham, Jung Min Lee, Yoonseok Han, Won Nam Kang, Tuson Park
Summary: Surface damage induced by low energy ion irradiation can significantly enhance the critical current density (J(c)) and irreversible magnetic field (H-irr) of MgB2 thin films. This improvement is attributed to the introduction of additional point defects and atomic lattice displacement, leading to a change in the pinning mechanism from weak collective pinning to strong plastic pinning.
CURRENT APPLIED PHYSICS
(2021)
Article
Clinical Neurology
Takafumi Hattori, Kazuhiro Shimo, Yuto Niwa, Yuji Tokiwa, Takako Matsubara
Summary: Pain and joint deformity are common symptoms of hip osteoarthritis, but there is no significant association between pain intensity and radiographic severity. Central sensitization may play a role in the joint pain of patients with hip OA, even with less severe joint deformity.
JOURNAL OF PAIN RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Soon-Gil Jung, Jung Min Lee, Tae-Ho Park, Tian Le, Xin Lu, Chan Young Lee, Sunmog Yeo, Han-Yong Choi, Won Nam Kang, Tuson Park
Summary: The study reveals the occurrence of quantum breakdown of superconductivity in MgB2 bilayers induced by magnetic fields, indicating that the disruption of quantum phase coherence is the cause of QBS.
NPG ASIA MATERIALS
(2021)
Article
Physics, Condensed Matter
Y. Haga, P. Opletal, Y. Tokiwa, E. Yamamoto, Y. Tokunaga, S. Kambe, H. Sakai
Summary: Single crystals of the unconventional superconductor UTe2 have been grown under different conditions, resulting in different superconducting transition temperatures and normal state properties. The stoichiometry of the samples has been accurately characterized, with the superconducting samples being nearly stoichiometric and the non-superconducting sample deviating significantly. The superconducting UTe2 exhibits partially gapped large density of states in the normal state, while the non-superconducting sample is characterized by a relatively large electronic specific heat.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Yoshinori Haga, Yoshifumi Tokiwa, Petr Opletal, Hiroki Fujibayashi, Katsuki Kinjo, Shunsaku Kitagawa, Kenji Ishida, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: Te-125 NMR experiments in UTe2 reveal slow electronic dynamics in the paramagnetic state, which are associated with the growth of long-range electronic correlations at low temperatures. The experiments also show that disorder or defects disturb the long-range electronic correlations, leading to an inhomogeneous electronic state.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Dai Aoki, Hironori Sakai, Petr Opletal, Yoshifumi Tokiwa, Jun Ishizuka, Youichi Yanase, Hisatomo Harima, Ai Nakamura, Dexin Li, Yoshiya Homma, Yusei Shimizu, Georg Knebel, Jacques Flouquet, Yoshinori Haga
Summary: This study reports the first observation of the de Haas-van Alphen (dHvA) effect in the novel spin-triplet superconductor UTe2. The researchers found that UTe2 has two types of cylindrical Fermi surfaces with strong corrugation, and the angular dependence of the dHvA frequencies is in good agreement with the calculated results.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Multidisciplinary Sciences
Kazuhiro Shimo, Sho Ogawa, Yuto Niwa, Yuji Tokiwa, Ayaka Dokita, Sho Kato, Takafumi Hattori, Takako Matsubara
Summary: The study investigates the threshold changes of different nerve fibers (A beta, A delta, and C) due to somatosensory stimulation. Non-noxious stimulation showed a significant increase only in A beta fibers, while noxious stimulation increased pain thresholds in both A delta and C fibers and sensory thresholds in A beta fibers. These findings suggest that nociceptive inputs selectively suppress nociceptive stimuli.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
H. Sakai, P. Opletal, Y. Tokiwa, E. Yamamoto, Y. Tokunaga, S. Kambe, Y. Haga
Summary: The molten salt flux method was used to synthesize single crystals of the spin-triplet superconductor UTe2. Under optimized growth conditions with excess uranium, the obtained single crystals exhibited the highest superconducting transition temperature (Tc = 2.1 K) reported for this compound. The results suggest that the increase in Tc in UTe2 can be achieved by reducing uranium vacancies and suppressing Te volatilization.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Clinical Neurology
Takafumi Hattori, Satoshi Ohga, Kazuhiro Shimo, Yuto Niwa, Yuji Tokiwa, Takako Matsubara
Summary: This study found an association between pain sensitization and response to exercise therapy in knee osteoarthritis patients, providing clinically predictive values for pressure pain threshold (PPT) and temporal summation of pain (TSP) in predicting the outcome of exercise.
JOURNAL OF PAIN RESEARCH
(2022)
Article
Clinical Neurology
Yuto Niwa, Kazuhiro Shimo, Satoshi Ohga, Yuji Tokiwa, Takafumi Hattori, Takako Matsubara
Summary: The study compared the effects of different exercise intensities on pain sensitivity and found that low and moderate-intensity exercises can increase pressure pain threshold and reduce temporal summation of pain, while high-intensity exercise only reduced temporal summation of pain in certain muscle groups. There were no significant differences in pain sensitivity changes between exercise intensities, except for relative pressure pain threshold change in the quadriceps.
JOURNAL OF PAIN RESEARCH
(2022)
Article
Physics, Multidisciplinary
Petr Opletal, Hironori Sakai, Yoshinori Haga, Yoshifumi Tokiwa, Etsuji Yamamoto, Shinsaku Kambe, Yo Tokunaga
Summary: We studied the physical properties of a single crystal of uranium telluride U7Te12. It was found that U7Te12 crystallizes in a hexagonal structure with three different crystallographic uranium sites. The paramagnetic moments were estimated to be approximately 1 µB per uranium site assuming a uniform moment on all the sites. A ferromagnetic phase transition occurred at TC = 48 K, with a sharp increase in in-plane magnetization while the out-of-plane component did not increase significantly. Further below TC under field-cooling conditions, the out-of-plane component increased rapidly around T* = 26 K, while the in-plane component showed little change at T*. Specific heat measurement indicated a crossover suggesting a reorientation of ordering moments or successive magnetic ordering of the multiple uranium sites.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Harim Jang, Vuong Thi Anh Hong, Jihyun Kim, Xin Lu, Tuson Park
Summary: The origin of the partial suppression of the electronic density states in the pseudogap behavior in high-Tc superconductivity has been controversial. This study investigates the quasiparticle scattering spectroscopy of the quantum critical superconductor CeCoIn5 and reveals the presence of a pseudogap with energy Ag. The results suggest that the pseudogap in CeCoIn5 is controlled by Kondo hybridization instead of being involved in the formation of superconducting Cooper pairs.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Zi-Yu Cao, Harim Jang, Seokmin Choi, Jihyun Kim, Suyoung Kim, Jian-Bo Zhang, Anir S. Sharbirin, Jeongyong Kim, Tuson Park
Summary: From point-contact spectroscopy (PCS) measurements, it is discovered that the applied pressure induces superconductivity in yttrium with two superconducting gaps at 48.6 GPa. The analysis of PCS spectra suggests that the larger gap is 3.63 meV and the smaller gap is 0.46 meV. Both gaps collapse on a single curve when scaled against reduced temperature, following the prediction from BCS theory. The successful application of PCS in yttrium shows its potential for future research on pressure-induced high-Tc superconductors.
NPG ASIA MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Vuong Thi Anh Hong, Harim Jang, Soon-Gil Jung, Yoonseok Han, Jin Hee Kim, Rahmatul Hidayati, Jong-Soo Rhyee, Tuson Park
Summary: This study reports the fully gapped pairing symmetry of high-entropy alloy superconductors and directly observes it using Andreev reflection spectroscopy. The superconducting energy gap follows the BCS theory, but the ratio of the gap to Tc is higher than the theoretical prediction, indicating that this superconductor belongs to the class of moderately coupled nodeless superconductors.
Article
Materials Science, Multidisciplinary
Dongwon Shin, Soon-Gil Jung, Sehun Seo, Jongmin Lee, Sanghan Lee, Jin Hee Kim, Jong-Soo Rhyee, Woo Seok Choi, Tuson Park
Summary: This study investigates the scaling behavior between Hall resistivity (pxy) and longitudinal resistivity (pxx) in FeSe0.7Te0.3 (FST) thin films, and explores the influence of different beta values on the vortex liquid state in FST thin films.
