High-field THz ESR measurements of one-dimensional frustrated spin system using magnetically aligned powder sample

High-field THz ESR measurements of one-dimensional frustrated spin system using magnetically aligned powder sample | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article High-field THz ESR measurements of one-dimensional frustrated spin system using magnetically aligned powder sample Susumu Okubo, Yoko Kitahara, Shigeo Hara, Takahiro Sakurai, Hitoshi Ohta, and 7 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7789509/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 23 Oct, 2025 Read the published version in Applied Magnetic Resonance → Version 1 posted 7 You are reading this latest preprint version Abstract Terahertz electron spin resonance (THz ESR) measurements of the S = 1/2 frustrated J 1 - J 2 chain material NaCuMoO 4 (OH) were conducted on a quasi-single-crystal (QSC) sample in a pulsed high magnetic field. The QSC sample was fabricated by modulating the rotation of powder sample in a static magnetic field, resulting in three-dimensional alignment. This paper presents the fabrication method for the QSC sample which was confirmed by the Laue pattern obtained by X-ray diffraction, and the degree of orientation indicated by the anisotropic spectrum of ESR. The THz ESR measurements on the QSC sample of NaCuMoO 4 (OH) were performed from 0.06 THz to 1.56 THz, and we observed ESR spectra for the single axis ( b -axis) above the saturation field. We demonstrate that the fabrication of magnetically aligned samples allows the observation of sharp single-axis absorption, even in the THz ESR range, which is challenging for a powder samples with a broad linewidth. Furthermore, we establish that this method is an effective approach for investigating magnetic anisotropy, even in antiferromagnetic powder samples. Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 23 Oct, 2025 Read the published version in Applied Magnetic Resonance → Version 1 posted Editorial decision: Revision requested 08 Oct, 2025 Reviews received at journal 07 Oct, 2025 Reviewers agreed at journal 07 Oct, 2025 Reviewers invited by journal 07 Oct, 2025 Editor assigned by journal 07 Oct, 2025 Submission checks completed at journal 07 Oct, 2025 First submitted to journal 06 Oct, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7789509","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":526385625,"identity":"84a56433-ca3b-4388-a3b7-64de45ea6140","order_by":0,"name":"Susumu Okubo","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAzklEQVRIiWNgGAWjYFACNgZmBgYbAwYJuMgBorSkka7lMLIWAkC+vS1NuqDivDG/dPMBZh4GO3kGxrP4rTE4c+yY9Iwzt80k5xxLAGpJNmxgOJeAX4tEeps0b9ttG4MbOea/eRiYgcrPGOB32AywlnNALfkfgLbUE9bCcCPtGFDLATOgLQxALYcJawH6Jdl6xplkY6BfDBjnGBw3bCPkF2CIGd4uqLAz7JdufsDwpqJanl+CQIihWwqMJ4kzpOgAA/4ekrWMglEwCkbB8AYArPs+nhsci0gAAAAASUVORK5CYII=","orcid":"","institution":"Kobe University","correspondingAuthor":true,"prefix":"","firstName":"Susumu","middleName":"","lastName":"Okubo","suffix":""},{"id":526385626,"identity":"8a8f2941-4cec-4f50-ad2d-97e94e06cfcb","order_by":1,"name":"Yoko Kitahara","email":"","orcid":"","institution":"Kobe University","correspondingAuthor":false,"prefix":"","firstName":"Yoko","middleName":"","lastName":"Kitahara","suffix":""},{"id":526385627,"identity":"c47aa05e-6159-438e-b0be-ad51d1a9318b","order_by":2,"name":"Shigeo Hara","email":"","orcid":"","institution":"Kobe University","correspondingAuthor":false,"prefix":"","firstName":"Shigeo","middleName":"","lastName":"Hara","suffix":""},{"id":526385628,"identity":"98b7aec5-150d-4077-add8-685c9237bdc9","order_by":3,"name":"Takahiro Sakurai","email":"","orcid":"","institution":"The University of Osaka","correspondingAuthor":false,"prefix":"","firstName":"Takahiro","middleName":"","lastName":"Sakurai","suffix":""},{"id":526385629,"identity":"3f5b1bd5-9042-439e-9a9b-0188ee55bee6","order_by":4,"name":"Hitoshi Ohta","email":"","orcid":"","institution":"Kobe University","correspondingAuthor":false,"prefix":"","firstName":"Hitoshi","middleName":"","lastName":"Ohta","suffix":""},{"id":526385630,"identity":"447491d4-86b0-413b-bcf8-460a829ddec8","order_by":5,"name":"Mitsuru Akaki","email":"","orcid":"","institution":"The University of Osaka","correspondingAuthor":false,"prefix":"","firstName":"Mitsuru","middleName":"","lastName":"Akaki","suffix":""},{"id":526385631,"identity":"e8907024-7cbd-4b17-91c3-03b4f5831be0","order_by":6,"name":"Masayuki Hagiwara","email":"","orcid":"","institution":"The University of Osaka","correspondingAuthor":false,"prefix":"","firstName":"Masayuki","middleName":"","lastName":"Hagiwara","suffix":""},{"id":526385632,"identity":"7bbc3196-9dce-498d-8d7a-292060789416","order_by":7,"name":"Fumiko Kimura","email":"","orcid":"","institution":"Kyoto University","correspondingAuthor":false,"prefix":"","firstName":"Fumiko","middleName":"","lastName":"Kimura","suffix":""},{"id":526385633,"identity":"8bd52aae-41db-47e0-a5c5-4940880e2c05","order_by":8,"name":"Tsunehisa Kimura","email":"","orcid":"","institution":"Kyoto University","correspondingAuthor":false,"prefix":"","firstName":"Tsunehisa","middleName":"","lastName":"Kimura","suffix":""},{"id":526385634,"identity":"d997a38d-d915-4099-8fd2-6e98f5b53ee4","order_by":9,"name":"Kazuhiro Nawa","email":"","orcid":"","institution":"Tohoku University","correspondingAuthor":false,"prefix":"","firstName":"Kazuhiro","middleName":"","lastName":"Nawa","suffix":""},{"id":526385635,"identity":"997cbca4-ad5a-4828-893b-7539a97bebe4","order_by":10,"name":"Yoshihiko Okamoto","email":"","orcid":"","institution":"The University of Tokyo","correspondingAuthor":false,"prefix":"","firstName":"Yoshihiko","middleName":"","lastName":"Okamoto","suffix":""},{"id":526385636,"identity":"2f979502-346f-4846-9777-11902937f594","order_by":11,"name":"Zenji. 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The QSC sample was fabricated by modulating the rotation of powder sample in a static magnetic field, resulting in three-dimensional alignment. This paper presents the fabrication method for the QSC sample which was confirmed by the Laue pattern obtained by X-ray diffraction, and the degree of orientation indicated by the anisotropic spectrum of ESR. The THz ESR measurements on the QSC sample of NaCuMoO\u003csub\u003e4\u003c/sub\u003e(OH) were performed from 0.06 THz to 1.56 THz, and we observed ESR spectra for the single axis (\u003cem\u003eb\u003c/em\u003e-axis) above the saturation field. We demonstrate that the fabrication of magnetically aligned samples allows the observation of sharp single-axis absorption, even in the THz ESR range, which is challenging for a powder samples with a broad linewidth. 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