SUPERCONDUCTOR SCIENCE & TECHNOLOGY
·
2024
·Vol. 37
·期 7
·075003
·
IF 3.7
Qing-Song Yang,Bin-Bin Ruan,Meng-Hu Zhou,Ya-Dong Gu,Kang Zhao,Yun-Qing Shi,Jun-Kun Yi,Le-Wei Chen,Ming-Wei Ma,Gen-Fu Chen,Zhi-An Ren
The hexagonal Mn5Si3-type compounds possess the capability to accommodate specific atoms in the interstices, thereby creating filled Mn5Si3-type structures. In Nb-based Mn5Si3-type system, interstitial atoms like carbon (C) or oxygen (O) have been identified to induce or enhance superconductivity. However, the compounds filled with nitrogen (N) are scarce, and the existence of a N-filled superconductor remains unknown. Here, we report the discovery of a novel ternary nitride superconductor, Nb5Ir3N, synthesized via incorporating N into the electride Nb5Ir3. The crystal structure of Nb5Ir3N conforms to the filled Mn5Si3-type, belonging to the P63/mcm space group (No. 193), with cell parameters a = b = 7.8398(2) Å and c = 5.1108(1) Å. Electrical resistivity and magnetic susceptibility demonstrate that Nb5Ir3N is a type-II superconductor with a Tc of 8.7 K. The estimated lower and upper critical fields are 11.0 mT and 12.16 T, respectively. Moreover, specific heat measurements confirm the bulk superconductivity with enhanced electron–phonon coupling in Nb5Ir3N, as demonstrated by the normalized specific heat jump ΔCe/γTc ∼ 1.59. First-principles calculations emphasize the strong spin–orbit coupling in Nb5Ir3N.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 136
·期 3
·
IF 2.7
Wang L. G.,Cui H.,Zhu C. M.,Wang R.,Yu G. B.,Su X. F.,Jiang X. L.,Jiang Y.
Some spinel chromium oxides with the chemical formula ACr 2 O 4 exhibit magnetic-induced multiferroicity due to the special spiral spin order. However, because of the relatively low temperature of the ordered spiral phase, this kind of multiferroicity generally displays a limited coexistence of magnetic and ferroelectric orders in a narrow temperature range. The Jahn–Teller (JT) effect, serving as a crucial link between charge and orbit degrees of freedom, can facilitate efficient modulation of multiferroic properties. In this work, Ni 1− x Cu x Cr 2 O 4 (0 ≤ x ≤ 0.2) series are synthesized by occupying the same Wyckoff site with two kinds of JT ions. The microstructure and JT distortion can be distinctly influenced by varying the doping level of Cu 2+ ions. Particularly, Ni 0.85 Cu 0.15 Cr 2 O 4 ( x = 0.15) presents the pronounced JT distortion, accompanied by observation of dielectric anomaly at ∼78 K, resulting from spin–orbit coupling. This implies that the JT effect can significantly promote the contribution of spin–orbit coupling in magnetoelectric correlation. Moreover, the magnetodielectric effect induced by intrinsic magnetoelectric coupling is confirmed in Ni 0.85 Cu 0.15 Cr 2 O 4 over a wide temperature range of 10–200 K, which is much higher than the Néel temperature of ∼85 K. It indicates that spin–orbit coupling based on the JT effect could overcome the constraint of magnetic order to achieve effective control on electric polarization performance under an applied magnetic field, thereby showing broad application prospects.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2021
·Vol. 9
·期 2
·740-747
·
IF 13.266
Ruiheng Pan,Kai Wang,Zhi-Gang Yu
The introduction of chiral organic ligands into hybrid organic–inorganic perovskites (HOIPs) results in chiral perovskites, which exhibit natural optical activities (NOAs) such as circularly polarized luminescence (CPL). CPL can be observed in achiral HOIPs under a magnetic field as well. Here, we systematically study the temperature- and magnetic field-dependence of both circular polarization and total intensity in chiral HOIPs. Pronounced CPL polarization is observed in polycrystalline films of chiral HOIPs, which can be further tuned by an applied magnetic field. The magnetic field also modifies the total intensity of CPL, giving rise to magneto-PL in chiral HOIPs, which is observable even at room temperature. The observed field and temperature-dependence of polarization can be well accounted for by a recently developed theory of chiral HOIPs, where the materials’ helicity gives rise to a novel spin–orbit coupling (SOC). The observed MPL can be quantitatively accounted for by the interplay of exciton fine structures and the magnetic field. Our study suggests that the magnetic field provides an effective means to manipulate both the polarization and intensity of CPL in chiral HOIPs, which can be exploited for novel device applications.
研究领域:
材料科学
·
光学
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Matter
·
2025
·
IF 17.5
Li Yang,Hao Wu,Fei Guo,Gaojie Zhang,Wenfeng Zhang,Haixin Chang
Electrical control of the anomalous Hall effect (AHE) provides an important gateway to reveal and regulate topological properties of spins. However, direct, immediate electrical tuning of the AHE in materials has been elusive, unfeasible, and rarely reported. Here, we demonstrate direct, immediate, nonlinear, electric current regulation of the AHE in a single, novel, van der Waals, room-temperature, ferromagnetic, ultrathin, two-dimensional (2D) crystal for intrinsic sensitivity of nodal electronic structures induced by 2D spin-orbit coupling (SOC) in a 2D quantum limit with an ultrasmall current (∼10 2 A cm −2 ). The multivalued electrical tuning of anomalous Hall resistance (R AHE ) ( R A H E 1 R A H E 2 ∗ 100 % ) is up to 584% and remains 126% at room temperature. The squared correlation between R AHE and longitudinal resistance indicates an SOC-dominated Berry curvature-induced AHE. This immediate-current AHE with distinct dependence on the dimension, crystal layer, and electronic topology provides unique quantum platforms for probing the essence of the dimension and for low-power spintronics and brain-like quantum devices.
研究领域:
凝聚态物理
·
量子材料
·
自旋电子学
✓ 已验证
产品关联
DOI
高影响因子
Magnetochemistry
·
2023
·Vol. 9
·期 11
·231
·
IF 2.7
Kai Wang,Liqin Yan,Youguo Shi,Baogen Shen,Lunhua He,Fangwei Wang,Jun Lu,Tongyun Zhao,Zunming Lu
Among the 5d transition metal iridates, Sr2IrO4, which has a layered chalcogenide structure, has received much attention due to its strong spin–orbit coupling (SOC), which produces Mott insulating states and anomalous physical behaviors. In this paper, the microscopic magnetism of Sr2IrO4is studied with electron spin resonance (ESR) measurements. The Lande factorgof the ferromagnetic resonance signal of Sr2IrO4shows anomalous behavior compared to typical ferromagnets. It gradually decreases, and the corresponding resonance fieldHrincreases, with decreasing temperature. The various physical parameters. including the saturated magnetic fieldHsderived fromM-H,Hr, ΔHpp, thegfactor and the intensityIextracted from ESR spectra, are analyzed in detail. Eventually, it is revealed that the anomalous behavior of theg-factor is induced by in-plane Dzyaloshinsky–Moriya interaction (DMI) rather than the SOC effect.
研究领域:
凝聚态物理
·
磁性材料
·
强关联电子系统
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自旋电子学
·
共振谱学
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Gaojie Zhang,Hao Wu,Li Yang,Zheng Chen,Wen Jin,Bichen Xiao,Wenfeng Zhang,Changsheng Song,Haixin Chang
Most methods for regulating physical and chemical properties of materials involve the breaking and formation of chemical bonds, which inevitably change local structures. Two-dimensional (2D) ferromagnets are critical for spintronic memory and quantum devices, but most of them maintain ferromagnetism at low temperature, and multiaspect control of 2D ferromagnetism at room temperature or above is still missing. Here, we report a nondestructive, van der Waals (vdW) interfacial magnetochemistry strategy for above-room-temperature, multiaspect 2D ferromagnetism regulation. By vdW coupling nonmagnetic MoS2, WSe2, or Bi1.5Sb0.5Te1.7Se1.3 with 2D vdW ferromagnet Fe3GaTe2, the Curie temperature is enhanced up to 400 K, best for 2D ferromagnets, with 26.8% tuning of room-temperature perpendicular magnetic anisotropy and an unconventional anomalous Hall effect up to 340 K. These phenomena originate from changes in magnetic exchange interactions and magnetic anisotropy energy by interfacial charge transfer and spin–orbit coupling. This work opens a pathway for engineering multifunctional 2D heterostructures by vdW interfacial magnetochemistry.
研究领域:
材料科学
·
凝聚态物理
·
自旋电子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Sheng'an Yang,Qingming Chen,Jin Hu,Yunrui Yang,Yan Gao,Ruidong Xu,Hui Zhang,Ji Ma
In the presence of magnetic field , reducing the loss in temperature coefficient of resistance ( TCR ) and increasing metal−insulator transition point ( T MI ) to room temperature are the most important concerns for the application of perovskite manganites in high−precision thermistors . Based on emerging evidence, relevant factor to address these problems lies in the interaction between Jahn−Teller (JT) distortion and magnetic field, which results in spin−orbital coupling (SOC) effect and significantly influences TCR and T MI . In this work, we studied the magnetic field induced SOC effect in polycrystalline La 1− x Ca x MnO 3 ( x = 0.225–0.45) materials synthesized via sol−gel technique. Compounds undergo the JT distortions with increasing Ca dopant content, and the most pronounced distortion of 0.0144 at x = 0.40 is correlated with a basal−plane distortion mode. All samples exhibit T MI values between 262 K and 288 K, indicating the enhancement of doping−induced double−exchange interaction. In the magnetic field of 1 T, SOC effect sufficiently suppresses the deterioration of TCR caused by deficient magnetization in La 0.6 Ca 0.4 MnO 3 to a value of 2.9%·K −1 at room temperature (287 K).
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 6
·期 3
·316-324
·
IF 6.482
Yuxuan Li,Keke Ding,Haozhong Wu,Qing Wan,Yao Ma,Yuhua Huang,Zhiming Wang,Weijie Zhang,Jianquan Hou,Ben Zhong Tang
Recently, research based on non-radiative decay processes leading to photodynamic therapy or photothermal therapy has become an attractive hotspot. Of particular importance is achieving better performance in photosensitive dye design. Herein, two comparable emitters (DEPZ-S and DEPZ-A) with the same electronic donor–acceptor segment were prepared, but their different symmetrical patterns caused different reactive oxygen species (ROS) generation capacity and photothermal conversion capacity, respectively, which indicates that their non-radiative decay channels could be switched between intersystem crossing (ISC) and thermal deactivation. Theoretical simulation exhibited coincident results, and their differentiated excited-state energy level distribution decided the non-radiative decay channels change: DEPZ-S with high intramolecular symmetry exhibited a larger spin–orbit coupling (SOC) matrix and smaller energy splitting (ΔEST) between singlet excited state and triplet excited state easily facilitating the ISC process, but asymmetric DEPZ-A with a narrow band gap (ΔES0S1) and big reorganization energy reduced the potential barrier of the thermal deactivation and increased its occurrence probability. After encapsulating two dyes with a hydrophilic polymer matrix to improve intake efficiency, both of them displayed good phototherapy treatment effect on bladder cancer cells through dynamic or thermal processes when light illuminated. This work provides a new strategy for tuning non-radiative decay channels via symmetric/asymmetric substituent effects to realize precise phototherapy.
研究领域:
生物医学
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材料科学
·
光化学
✓ 已验证
DOI
高影响因子
Chemical Science
·
2025
·
IF 7.4
Yibo Cui,Jiawei Lin,Kunjie Liu,Yuhe Shao,Dong Zhao,Zhongnan Guo,Jing Zhao,Zhiguo Xia,Quanlin Liu
Organic–inorganic metal halides with tunable and state room-temperature phosphorescence (RTP) properties in advanced luminescent materials have received broad interest. Herein, 2-(methylamino)pyridine (MAP), 2-[(methylamino)methyl]pyridine (MAMP), and 2-(2-methylaminoethyl)pyridine (MAEP) were designed and hybridized with Zn2+ and Cl−/Br−, yielding 11 hybrid materials. MAP-based compounds, with a narrow bandgap (3.57 eV), exhibit limited RTP due to inefficient intersystem crossing (ISC) and unstable triplet excitons. In contrast, MAMP (4.49 eV)- and MAEP (4.50 eV)-based compounds achieve enhanced RTP through bandgap alignment with Zn halides, enabling efficient energy transfer, ISC, and triplet exciton stabilization via strong hydrogen bonding and π-conjugation effects. Covalent bonding in MAMP and MAEP compounds provides greater rigidity and exciton stability than hydrogen-bonded systems, resulting in prolonged afterglow durations, while Br-bonding enhances ISC and spin–orbit coupling (SOC), and the weak interactions increase non-radiative decay, further reducing afterglow duration. Density functional theory calculations confirm the enhanced SOC in MAMP and MAEP compounds, further improving RTP efficiency. This work demonstrates the precise control of RTP properties, highlighting the potential in advanced anti-counterfeiting and emerging photonics applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Zhinan Jiang,Yonggang Yang,Yang Liu,Tiantian Guan,Chaochao Qin,Yufang Liu
The para -linked carbazole-biphenyl (CBP) is commonly utilized in phosphorescent organic light-emitting diodes. This study investigates the steric hindrance and heavy-atom effects in CBP derivatives through transient absorption spectroscopy. In contrast to CBP, CBP derivatives shows new triplet–triplet absorption signals and isosbestic points, accompanied by the decay of excited state absorption signal, which indicates the occurrence of intersystem crossing (ISC). The experimental ISC lifetimes for mCBP, CDBP, and CPB-2Br are 8 ns, 7.4 ns, and 0.103 ns respectively, aligning with the increased theoretical spin–orbit coupling constants (ξ) of S 1 → T 1 (0.032 cm −1 < 0.034 cm −1 < 1.26 cm −1 ). Notably, compared to CDBP (0.75 cm −1 , 0.3 μs), the lower ξ(T 1 , S 0 ) of mCBP (0.014 cm −1 ) extending the experimental triplet-exciton lifetimes (τ T ) to 1.97 μs. The τ T (1.92 μs) of CBP-2Br is prolonged due to the significantly reduced recombination energy (2073.52 cm −1 ). This study provides insights into prolonging the lifetime of halogen-free phosphorescent molecules.
研究领域:
材料科学
·
光物理学
✓ 已验证
DOI
PubMed
高影响因子
Frontiers of Physics
·
2022
·Vol. 18
·期 1
·1-10
·
IF 5.142
Xu Meng,Guo Lei,Chen Lei,Zhang Ying,Li Shuang-Shuang,Zhao Weiyao,Wang Xiaolin,Dong Shuai,Zheng Ren-Kui
Weak antilocalization (WAL) effect is commonly observed in low-dimensional systems, three-dimensional (3D) topological insulators and semimetals. Here, we report the growth of high-quality Ta 0.7 Nb 0.3 Sb 2 single crystals via the chemical vapor transport (CVT). Clear sign of the WAL effect is observed below 50 K, probably due to the strong spin—orbital coupling in 3D bulk. In addition, it is worth noting that a relatively large MR of 120% appears under 1 T magnetic field at T = 2 K. Hall measurements and two-band model fitting results reveal high carrier mobility (>1000 cm 2 · V −1 ·s− 1 in 2–300 K region), and off-compensation electron/hole ratio of ∼8:1. Due to the angular dependence of the WAL effect and the fermiology of the Ta 0.7 Nb 0.3 Sb 2 crystals, interesting magnetic-field-induced changes of the symmetry of the anisotropic magnetoresistance (MR) from two-fold (≤ 0.6 T) to four-fold (0.8–1.5 T) and finally to two-fold (≥ 2 T) are observed. This phenomenon is attributed to the mechanism shift from the low-field WAL dominated MR to WAL and fermiology co-dominated MR and finally to high-field fermiology dominated MR. All these signs indicate that Ta 0.7 Nb 0.3 Sb 2 may be a topological semimetal candidate, and these magnetotransport properties may attract more theoretical and experimental exploration of the (Ta,Nb)Sb 2 family.
研究领域:
凝聚态物理
·
材料科学
·
量子输运
·
拓扑物态
·
半导体物理
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Yajie Zhang,Chuan Huang,Xingyuan Liao,Saiyaer Sidike,Mingming Guo,Yichuan Zhang
Carbonized polymer dots (CPDs) have been studied extensively for room temperature phosphorescence (RTP) due to their low cost, good biocompatibility and crosslink-enhanced emission effect. Although considerable achievements have been reached in recent years, it is still a formidable task to prepare long-lived RTP CPDs. Herein, the Arg-CPDs was introduced into a rigid boric acid (BA) matrix to enhance the RTP lifetime of the Arg-CPDs@BA composites. The nitrogen-rich arginine framework integrated with phosphorus doping enhances spin-orbit coupling and accelerates the intersystem crossing and promotes the generation of triplet excitons. The formed C B covalent bond between Arg-CPDs and rigid B 2 O 3 matrix restricts the vibration and rotation of CPDs, thus inhibiting the non-radiative transition of the triplet excitons and making the composite exhibit a relatively long-lived RTP emission of 983 ms (18 s for naked eyes). It was nearly seven times longer than that of the matrix-free Arg-CPDs. Besides, the potential applications in anti-counterfeiting and white light-emitting diodes were demonstrated.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）