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  1. Artikel ; Online: Ambipolar Superconductivity with Strong Pairing Interaction in Monolayer 1T'-MoTe

    Tang, Fangdong / Wang, Peipei / Wang, Qixing / Gan, Yuan / Lyu, Jian / Mi, Xinrun / He, Mingquan / Zhang, Liyuan / Smet, Jurgen H

    Nano letters

    2023  Band 23, Heft 16, Seite(n) 7516–7523

    Abstract: Gate tunable two-dimensional (2D) superconductors offer significant advantages in studying superconducting phase transitions. Here, we address superconductivity in exfoliated 1T'- ... ...

    Abstract Gate tunable two-dimensional (2D) superconductors offer significant advantages in studying superconducting phase transitions. Here, we address superconductivity in exfoliated 1T'-MoTe
    Sprache Englisch
    Erscheinungsdatum 2023-08-04
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c02033
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Buch ; Online: The microscopic origin of the spin-induced linear and quadratic magnetoelectric effects

    Pi, Maocai / Xu, Xifan / He, Mingquan / Chai, Yisheng

    2021  

    Abstract: Understanding of the intimate cross-coupling between electric and magnetic degrees of freedom in solids usually requires sophisticated models and time-consuming calculation methods. Instead of macroscopic symmetry analysis, we present a simple but ... ...

    Abstract Understanding of the intimate cross-coupling between electric and magnetic degrees of freedom in solids usually requires sophisticated models and time-consuming calculation methods. Instead of macroscopic symmetry analysis, we present a simple but general approach to explore the microscopic mechanism of magnetoelectric (ME) effects in magnetic ordered materials based on local spin and lattice symmetry analysis. Our methods are successfully applied to Cr$_2$O$_3$ and orthorhombic RMnO$_3$ with linear and quadratic ME effects, respectively. We revealed all the possible microscopic origins of every non-zero ME coefficients that cannot be easily fulfilled by other theoretical methods. Moreover, the contribution from each mechanism can be located down to specific spins or spin pairs. Our theoretical approach is capable of providing a detailed guide to explore rich spin-induced magnetoelectrics with strong ME effects.

    Comment: 3 figures
    Schlagwörter Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Thema/Rubrik (Code) 530
    Erscheinungsdatum 2021-10-07
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Artikel: Enhanced electrochemical performance in an aluminium doped δ-MnO₂ supercapacitor cathode: experimental and theoretical investigations

    Wan, Jing / Ji, Peiyuan / Li, Bangxing / Xi, Yi / Gu, Xiao / Huang, Li / He, Mingquan / Hu, Chenguo

    Chemical communications. 2022 Jan. 6, v. 58, no. 4

    2022  

    Abstract: One of the biggest challenges faced by the layered manganese oxide MnO₂ used as a supercapacitor cathode is the capacity fading caused by chemo-mechanical degradation and/or structural transformation occurring in the discharging/charging process. Here, ... ...

    Abstract One of the biggest challenges faced by the layered manganese oxide MnO₂ used as a supercapacitor cathode is the capacity fading caused by chemo-mechanical degradation and/or structural transformation occurring in the discharging/charging process. Here, based on systematical experimental measurements and theoretical calculations, we show that both the stability and rate performance of the δ-MnO₂ supercapacitor cathode can be significantly enhanced by Al doping. Compared with pure δ-MnO₂, Al doping (δ-Al₀.₀₆MnO₂) clearly improves the specific capacitance (7% enhancement at 0.1 mA cm⁻²) and cycling stability (12% enhancement after 5000 cycles) simultaneously. These improvements can be attributed to the enhanced electronic transport and formation of more active sites, which are introduced by Al doping. Additionally, our calculations demonstrate that the doped systems (Al atoms located at Mn or O sites) show smaller surface energies than that of pure δ-MnO₂, which hinders side reactions or structure transformations and leads to a better cycling lifetime. Our work gives a comprehensive understanding of the impacts on the performance of δ-MnO₂ introduced by Al doping, and provides a feasible scheme to study the electrochemical mechanism of metal-doped δ-MnO₂.
    Schlagwörter aluminum ; capacitance ; cathodes ; electrochemical capacitors ; electrochemistry ; manganese monoxide
    Sprache Englisch
    Erscheinungsverlauf 2022-0106
    Umfang p. 589-592.
    Erscheinungsort The Royal Society of Chemistry
    Dokumenttyp Artikel
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d1cc06198d
    Datenquelle NAL Katalog (AGRICOLA)

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  4. Artikel ; Online: Colossal c-Axis Response and Lack of Rotational Symmetry Breaking within the Kagome Planes of the CsV_{3}Sb_{5} Superconductor.

    Frachet, Mehdi / Wang, Liran / Xia, Wei / Guo, Yanfeng / He, Mingquan / Maraytta, Nour / Heid, Rolf / Haghighirad, Amir-Abbas / Merz, Michael / Meingast, Christoph / Hardy, Frédéric

    Physical review letters

    2024  Band 132, Heft 18, Seite(n) 186001

    Abstract: The kagome materials AV_{3}Sb_{5} (A=K, Rb, Cs) host an intriguing interplay between unconventional superconductivity and charge-density waves. Here, we investigate CsV_{3}Sb_{5} by combining high-resolution thermal-expansion, heat-capacity, and ... ...

    Abstract The kagome materials AV_{3}Sb_{5} (A=K, Rb, Cs) host an intriguing interplay between unconventional superconductivity and charge-density waves. Here, we investigate CsV_{3}Sb_{5} by combining high-resolution thermal-expansion, heat-capacity, and electrical resistance under strain measurements. We directly unveil that the superconducting and charge-ordered states strongly compete, and that this competition is dramatically influenced by tuning the crystallographic c axis. In addition, we report the absence of additional bulk phase transitions within the charge-ordered state, notably associated with rotational symmetry breaking within the kagome planes. This suggests that any breaking of the C_{6} invariance occurs via different stacking of C_{6}-symmetric kagome patterns. Finally, we find that the charge-density-wave phase exhibits an enhanced A_{1g}-symmetric elastoresistance coefficient, whose large increase at low temperature is driven by electronic degrees of freedom.
    Sprache Englisch
    Erscheinungsdatum 2024-05-17
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.132.186001
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: Enhanced electrochemical performance in an aluminium doped δ-MnO

    Wan, Jing / Ji, Peiyuan / Li, Bangxing / Xi, Yi / Gu, Xiao / Huang, Li / He, Mingquan / Hu, Chenguo

    Chemical communications (Cambridge, England)

    2022  Band 58, Heft 4, Seite(n) 589–592

    Abstract: One of the biggest challenges faced by the layered manganese oxide ... ...

    Abstract One of the biggest challenges faced by the layered manganese oxide MnO
    Sprache Englisch
    Erscheinungsdatum 2022-01-06
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d1cc06198d
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel ; Online: First-principles study of vanadium carbides as electrocatalysts for hydrogen and oxygen evolution reactions.

    Wan, Jing / Wang, Congcong / Tang, Qian / Gu, Xiao / He, Mingquan

    RSC advances

    2019  Band 9, Heft 64, Seite(n) 37467–37473

    Abstract: Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), while a satisfactory understanding of the underlying mechanisms still remains a challenge. ... ...

    Abstract Vanadium carbides have attracted much attention as highly active catalysts in both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), while a satisfactory understanding of the underlying mechanisms still remains a challenge. Herein we apply first-principles calculations to systematically analyze the crystal structures, electronic properties, free energies during the HER and OER processes, surface energies and crystal formation energies of the three types of vanadium carbides,
    Sprache Englisch
    Erscheinungsdatum 2019-11-15
    Erscheinungsland England
    Dokumenttyp Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/c9ra06539c
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel ; Online: Electronic Nematicity in URu_{2}Si_{2} Revisited.

    Wang, Liran / He, Mingquan / Hardy, Frédéric / Aoki, Dai / Willa, Kristin / Flouquet, Jacques / Meingast, Christoph

    Physical review letters

    2020  Band 124, Heft 25, Seite(n) 257601

    Abstract: The nature of the hidden-order (HO) state in URu_{2}Si_{2} remains one of the major unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray diffraction, and elastoresistivity data have suggested that the HO phase transition at T_{ ... ...

    Abstract The nature of the hidden-order (HO) state in URu_{2}Si_{2} remains one of the major unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray diffraction, and elastoresistivity data have suggested that the HO phase transition at T_{HO}≈ 17.5  K is driven by electronic nematic effects. Here, we search for thermodynamic signatures of this purported structural instability using anisotropic thermal expansion, Young's modulus, elastoresistivity, and specific-heat measurements. In contrast to the published results, we find no evidence of a rotational symmetry breaking in any of our data. Interestingly, our elastoresistivity measurements, which are in full agreement with published results, exhibit a Curie-Weiss divergence, which we however attribute to a volume and not to a symmetry-breaking effect. Finally, clear evidence for thermal fluctuations is observed in our heat-capacity data, from which we estimate the HO correlation length.
    Sprache Englisch
    Erscheinungsdatum 2020-07-08
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.257601
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel ; Online: Two-Dimensional Quantum Hall Effect and Zero Energy State in Few-Layer ZrTe

    Tang, Fangdong / Wang, Peipei / He, Mingquan / Isobe, Masahiko / Gu, Genda / Li, Qiang / Zhang, Liyuan / Smet, Jurgen H

    Nano letters

    2021  Band 21, Heft 14, Seite(n) 5998–6004

    Abstract: Topological matter plays a central role in today's condensed matter research. Zirconium pentatelluride ( ... ...

    Abstract Topological matter plays a central role in today's condensed matter research. Zirconium pentatelluride (ZrTe
    Sprache Englisch
    Erscheinungsdatum 2021-07-12
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.1c00958
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: Large Magneto-Transverse and Longitudinal Thermoelectric Effects in the Magnetic Weyl Semimetal TbPtBi.

    Wang, Honghui / Zhou, Zizhen / Ying, Jianjun / Xiang, Ziji / Wang, Rui / Wang, Aifeng / Chai, Yisheng / He, Mingquan / Lu, Xu / Han, Guang / Pan, Yu / Wang, Guoyu / Zhou, Xiaoyuan / Chen, Xianhui

    Advanced materials (Deerfield Beach, Fla.)

    2022  , Seite(n) e2206941

    Abstract: Magnetic topological semimetals provide new opportunities for power generation and solid-state cooling based on thermoelectric (TE) effect. The interplay between magnetism and nontrivial band topology prompts the magnetic topological semimetals to yield ... ...

    Abstract Magnetic topological semimetals provide new opportunities for power generation and solid-state cooling based on thermoelectric (TE) effect. The interplay between magnetism and nontrivial band topology prompts the magnetic topological semimetals to yield strong transverse TE effect, while the longitudinal TE performance is usually poor. Herein, it is demonstrated that the magnetic Weyl semimetal TbPtBi has high value for both transverse and longitudinal thermopower with large power factor (PF). At 300 K and 13.5 Tesla, the transverse thermopower and PF reach up to 214 µV K
    Sprache Englisch
    Erscheinungsdatum 2022-10-27
    Erscheinungsland Germany
    Dokumenttyp Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202206941
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Buch ; Online: Electronic nematicity in URu2Si2 revisited

    Wang, Liran / He, Mingquan / Hardy, Frederic / Aoki, Dai / Willa, Kristin / Flouquet, Jacques / Meingast, Christoph

    2020  

    Abstract: The nature of the hidden-order (HO) state in URu2Si2 remains one of the major unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray diffraction and elastoresistivity data have suggested that the HO phase transition at THO = 17.5 ... ...

    Abstract The nature of the hidden-order (HO) state in URu2Si2 remains one of the major unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray diffraction and elastoresistivity data have suggested that the HO phase transition at THO = 17.5 K is driven by electronic nematic effects. Here, we search for thermodynamic signatures of this purported structural instability using anisotropic thermal-expansion, Young\'s modulus, elastoresistivity and specific-heat measurements. In contrast to the published results, we find no evidence of a rotational symmetry-breaking in any of our data. Interestingly, our elastoresistivity measurements, which are in full agreement with published results, exhibit a Curie-Weiss divergence, which we however attribute to a volume and not to a symmetry-breaking effect. Finally, clear evidence for thermal fluctuations is observed in our heat-capacity data, from which we estimate the HO correlation length.

    Comment: 4 Figures, 5 pages
    Schlagwörter Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Thema/Rubrik (Code) 612
    Erscheinungsdatum 2020-05-03
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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