Mason Klemm

Thermoelectric evidence of the electronic structure changes from the charge density wave transition in FeGe

Kaila Jenkins, Yuan Zhu, Dechen Zhang, Guoxin Zheng et autres

Kagome metals provide a material platform for probing new correlated quantum phenomena due to the naturally incorporated linear dispersions, flat bands, and Van Hove singularities in their electronic structures. Among these quantum phenomena is the charge density wave (CDW), or the distortion …

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Spin excitation continuum from degenerate states in the mixed ferro-antiferromagnetic exchange system CeMgAl 11 O 19

Bin Gao, Chunxiao Liu, Mason Klemm, Shu Zhang et autres

In the search for unconventional magnetism, exotic quantum states are characterized by a lack of order and a broad spin excitation continuum approaching zero temperature. We study the two-dimensional triangular-lattice effective spin- 1 2 system CeMgAl 11 O 19 , which shows …

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Spin excitation continuum from degenerate states in the mixed ferro-antiferromagnetic exchange system CeMgAl ₁₁ O ₁₉

Bin Gao, T. Chen, Chunxiao Liu, Mason Klemm et autres

In the search for unconventional magnetism, exotic quantum states are characterized by a lack of order and a broad spin excitation continuum approaching zero temperature. We study the two-dimensional triangular-lattice effective spin-[Formula: see text] system CeMgAl₁₁O₁₉, which shows slight disorder but no …

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Probing the effective mass and fermi velocity of charges by momentum-resolved electron energy loss spectroscopy

Chih-Ying Huang, Somboon Fongchaiya, Hung Cj, Ta-Lei Chou et autres

The effective mass (m*) and Fermi velocity (vF) are two fundamental gauges of the electronic properties of materials and conventionally measured by magnetotransport characterizations. In this Review, we introduce momentum(q)-resolved electron energy loss spectroscopy (q-EELS) as an alternative method for probing m* …

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Interacting spin and charge density waves in the kagome metal FeGe

Mason Klemm, Tingjun Zhang, Barry Winn, Fankang Li et autres

Unveiling the interplay between spin density wave (SDW) and charge density wave (CDW) orders in correlated electron materials is important in obtaining a comprehensive understanding of their electronic, structural, and magnetic properties. Kagome lattice materials are interesting because their flat electronic bands, …

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Interacting spin and charge density waves in kagome metal FeGe

Mason Klemm, T. Zhang, Fankang Li, Feng Ye et autres

Unveiling the interplay between spin density wave (SDW) and charge density wave (CDW) orders in correlated electron materials is important to obtain a comprehensive understanding of their electronic, structural, and magnetic properties. Kagome lattice materials are interesting because their flat electronic bands, …

Disentangling the intertwined orders in a magnetic kagome metal

Ji Seop Oh, Ananya Biswas, Mason Klemm, Hengxin Tan et autres

Intertwined orders appear when multiple orders are strongly interacting, and kagome metals have emerged as new platforms to explore exotic phases. FeGe has been found to develop a charge density wave (CDW) order within magnetic phase, suggesting an intricate interplay of the …

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Microscopic Origins of the Long-Range Charge-Density Wave in Kagome FeGe

Saif Siddique, Mason Klemm, Qi Tang, Mehrdad T. Kiani et autres

Charge-density wave (CDW) is an electronic state characterized by modulations of the electron density and periodic lattice distortions [1]. Like other correlated electronic states, systems with CDWs exhibit strong electron-electron and electron-phonon interactions and hence CDW phases are often found near superconductivity …

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Correlation between complex spin textures and the magnetocaloric and Hall effects in Eu ( Ga 1 − x Al x ) 4 ( x = 0.9 , 1)

Kelly J. Neubauer, Kevin Allen, Jaime M. Moya, Mason Klemm et autres

Determining the electronic phase diagram of a quantum material as a function of temperature ($T$) and applied magnetic field ($H$) forms the basis for understanding the microscopic origin of transport properties, such as the anomalous Hall effect (AHE) and topological Hall effect …

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Vacancy-induced suppression of charge density wave order and its impact on magnetic order in kagome antiferromagnet FeGe

Mason Klemm, Saif Siddique, Y. H. Chang, Sijie Xu et autres

Two-dimensional (2D) kagome lattice metals are interesting because their corner sharing triangle structure enables a wide array of electronic and magnetic phenomena. Recently, post-growth annealing is shown to both suppress charge density wave (CDW) order and establish long-range CDW with the ability …

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Correlation between Complex Spin Textures and the Magnetocaloric and Hall Effects in Eu(Ga$_{1-x}$Al$_x$)$_4$ ($x$ = 0.9, 1)

Kelly J. Neubauer, Kevin Allen, Jaime M. Moya, Mason Klemm et autres

Determining the electronic phase diagram of a quantum material as a function of temperature (T) and applied magnetic field (H) forms the basis for understanding the microscopic origin of transport properties, such as the anomalous Hall effect (AHE) and topological Hall effect …

Decarbonization of Nitrogen Fertilizers, from Production to Runoff: A Policy Memo

Luis Delgado, Mason Klemm, Matías Federico Milia, Alyssa Rudelis et autres

Decarbonization of agriculture is critical to reshaping the U.S. economy as climate-resilient and less carbon-intensive. Decarbonizing nitrogen fertilizers specifically is increasingly important for the U.S. to achieve its climate targets while feeding a growing population in a changing climate, as around 5% …

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