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Ga Vacancy Defects in β-Ga2O3: Recent Advances and Open Questions β-Ga2O3中Ga空位缺陷的研究进展及有待解决的问题
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-28 DOI: 10.1007/s00723-026-01864-6
H. J. von Bardeleben, U. Gerstmann
{"title":"Ga Vacancy Defects in β-Ga2O3: Recent Advances and Open Questions","authors":"H. J. von Bardeleben,&nbsp;U. Gerstmann","doi":"10.1007/s00723-026-01864-6","DOIUrl":"10.1007/s00723-026-01864-6","url":null,"abstract":"<div><p>Among the intrinsic defects in the wide band-gap β-Ga<sub>2</sub>O<sub>3</sub> semiconductor, the Ga vacancy defects are often invoked to explain the observed electrical compensation in n-type conductive substrates and thin films. In β-Ga<sub>2</sub>O<sub>3</sub>, we have two nonequivalent Ga sites characterized by tetrahedral and octahedral coordinated oxygen first neighbors and thus in principle at least two distinct Ga vacancy defects which both have been predicted to be deep acceptors. Vacancy defects are generally generated in a controlled way by particle irradiation (electrons, protons, ions) and ion implantation. Indeed, Ga vacancy-related defects with spin <i>S</i> = 1/2 and <i>S</i> = 1 have been detected and investigated by electron paramagnetic resonance spectroscopy after such treatments. More recently, Ga vacancies with modified properties have also been evidenced after high-temperature annealing. In this review, we will discuss the experimental and computational results concerning these defects and show some still unresolved questions.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Time-Domain Low Field 1H NMR Study of Water Confined in Hierarchical Mesoporous ZSM-5 Zeolites 分级介孔ZSM-5沸石中水的时域低场1H NMR研究
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-28 DOI: 10.1007/s00723-026-01870-8
Marina G. Shelyapina, Dmitry Mizyulin, Kirill B. Nerinovski, Konstantin V. Tyutyukin, Azamat Samadov, Rosario I. Yocupicio‑Gaxiola, Irina A. Zvereva, Vitalii Petranovskii
{"title":"Time-Domain Low Field 1H NMR Study of Water Confined in Hierarchical Mesoporous ZSM-5 Zeolites","authors":"Marina G. Shelyapina,&nbsp;Dmitry Mizyulin,&nbsp;Kirill B. Nerinovski,&nbsp;Konstantin V. Tyutyukin,&nbsp;Azamat Samadov,&nbsp;Rosario I. Yocupicio‑Gaxiola,&nbsp;Irina A. Zvereva,&nbsp;Vitalii Petranovskii","doi":"10.1007/s00723-026-01870-8","DOIUrl":"10.1007/s00723-026-01870-8","url":null,"abstract":"<div><p>Hierarchical mesoporous ZSM-5 zeolites were prepared via alkaline desilication and pillaring, and characterized by a combination of XRD, N<sub>2</sub> adsorption, <sup>29</sup>Si MAS NMR, SEM, and low-field 1D and 2D (<i>T</i><sub>1</sub>–<i>T</i><sub>2</sub> correlation) <sup>1</sup>H NMR relaxation of confined water. Alkaline treatment resulted in a progressive desilication, increased mesopore volume, and the formation of surface defects, whereas pillaring produced more ordered mesoporosity. The <i>T</i><sub>1</sub>–<i>T</i><sub>2</sub> correlation maps revealed distinct relaxation regimes reflecting the strength of the water–surface interactions. The samples with different mesopore organization exhibit very different surface relaxivities and <i>T</i><sub>1</sub>/<i>T</i><sub>2</sub>: as compared with the parent microporous zeolite, the samples with disordered mesoporosity introduced via the alkaline treatment show higher surface relaxivities but lower <i>T</i><sub>1</sub>/<i>T</i><sub>2</sub>, whereas the pillared sample, oppositely, exhibits surface relaxivities close to that of the parent sample and essentially higher <i>T</i><sub>1</sub>/<i>T</i><sub>2</sub> ratio. The decoupling of <i>T</i><sub>1</sub> and <i>T</i><sub>2</sub> points out on a complex water dynamics in the pillared zeolite with ordered micro- and mesoporosity.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnon Laser 马侬姑娘激光
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-26 DOI: 10.1007/s00723-026-01863-7
Yury M. Bunkov, Georgy A. Knyazev, Aleksey N. Kuzmichev, Petr M. Vetoshko
{"title":"Magnon Laser","authors":"Yury M. Bunkov,&nbsp;Georgy A. Knyazev,&nbsp;Aleksey N. Kuzmichev,&nbsp;Petr M. Vetoshko","doi":"10.1007/s00723-026-01863-7","DOIUrl":"10.1007/s00723-026-01863-7","url":null,"abstract":"<div><p>This article presents the spatial transport of magnon Bose-Einstein condensate (mBEC) from their excitation region. It is shown that at a magnon density sufficient to BEC formation, a flow of coherent magnons is formed, analogous to the spatial flow of atoms in the BEC state, known as an atomic laser. We successfully reproduced the magnon laser effect, which is largely analogous to an atomic laser. However, unlike an atomic laser, a magnon laser also generates coherent polariton radiation, which we also observed. This new mechanism of coherent radiation and transport opens up new prospects for quantum applications.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EPR Spectroscopy of Traces of Fossilized Carbonaceous Matter in Agates of the Tevinskoye Deposit (Northern Kamchatka, Russia) 俄罗斯堪察加北部Tevinskoye矿床玛瑙中碳质化石的EPR光谱分析
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-26 DOI: 10.1007/s00723-026-01869-1
R. I. Mashkovtsev, G. A. Palyanova
{"title":"EPR Spectroscopy of Traces of Fossilized Carbonaceous Matter in Agates of the Tevinskoye Deposit (Northern Kamchatka, Russia)","authors":"R. I. Mashkovtsev,&nbsp;G. A. Palyanova","doi":"10.1007/s00723-026-01869-1","DOIUrl":"10.1007/s00723-026-01869-1","url":null,"abstract":"<div><p>Agate pebble samples were collected at the Tevinskoye deposit (northern Kamchatka Peninsula, Russia). Simple organic radicals trapped in the microcrystalline portions of the sample, consisting predominantly of chalcedony, were studied using EPR spectroscopy. Traces of fossilized carbonaceous matter were discovered in agate for the first time. Due to the free rotation of the radicals in untreated samples, only isotropic EPR spectra associated with ĊH<sub>3</sub>, R1 ĊH<sub>2</sub>, R2 ĊH<sub>2</sub>, and CO<sub>2</sub><sup>−</sup> were observed. The EPR spectra changed upon grinding or heating of the agate samples. The carbon radical Ċ, localized in complex organic molecules, was detected after stepwise annealing of the samples at temperatures above 300 °C. Changes in the <i>g</i>-factor, linewidth, and resonance line shapes of the carbon radical depending on the annealing temperature were investigated and discussed.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterization of Hexafluorobenzene Long-Term Gamma Radiolysis Product by 19F and 13C MAS NMR 用19F和13C MAS核磁共振表征六氟苯长期γ辐射裂解产物
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-23 DOI: 10.1007/s00723-026-01868-2
S. G. Vasil’ev, Y. M. Shulga, E. N. Kabachkov, P. P. Kushch, G. A. Kichigina, D. P. Kiryukhin, M. V. Zhidkov
{"title":"Characterization of Hexafluorobenzene Long-Term Gamma Radiolysis Product by 19F and 13C MAS NMR","authors":"S. G. Vasil’ev,&nbsp;Y. M. Shulga,&nbsp;E. N. Kabachkov,&nbsp;P. P. Kushch,&nbsp;G. A. Kichigina,&nbsp;D. P. Kiryukhin,&nbsp;M. V. Zhidkov","doi":"10.1007/s00723-026-01868-2","DOIUrl":"10.1007/s00723-026-01868-2","url":null,"abstract":"<div><p>A solid product was obtained during a long-term gamma irradiation of liquid hexafluorobenzene in a glass tube under oxygen-free conditions. Complete conversion into a solid was achieved at a total dose of 2.6 10<sup>7</sup> Gy and there was no significant gas yield. The XPS data show that the product is similar in elemental composition to the parent hexafluorobenzene and the contact angle measurements demonstrate hydrophobicity of the material. Obtained NMR data suggest that the material predominantly consists of perfluoropolystyrene units and short fluoroalkyl fragments present in much smaller amounts.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ODMR-Based Resonant Spin Inertia: A Sensitive Technique for Studying Spin Relaxation 基于odmr的共振自旋惯性：一种研究自旋弛豫的灵敏技术
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-20 DOI: 10.1007/s00723-026-01858-4
Vasilii V. Belykh
{"title":"ODMR-Based Resonant Spin Inertia: A Sensitive Technique for Studying Spin Relaxation","authors":"Vasilii V. Belykh","doi":"10.1007/s00723-026-01858-4","DOIUrl":"10.1007/s00723-026-01858-4","url":null,"abstract":"<div><p>We describe the principle and applications of the resonant spin inertia technique that is based on optically detected magnetic resonance. It combines optical pumping and Faraday/Kerr rotation probing in a single laser beam and measures spin resonance and the spin inertia effect induced by a modulated radiofrequency field. This method is sensitive, technically simple, and applicable to a wide range of material systems. It provides access to the basic spin properties, including the longitudinal spin relaxation time <span>(T_1)</span>, which can be measured selectively for different spin resonances present in the system. We demonstrate the application of the technique to rare-earth Ce<span>(^{3+})</span> ions in a YAG matrix, (In,Ga)As/GaAs quantum dots, and lead halide perovskite nanocrystals. The technique allowed to measure <span>(T_1)</span> in these systems, ranging from microseconds to milliseconds, and to reveal peculiarities of spin relaxation for charge carriers as well as for spatially indirect excitons.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00723-026-01858-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Application of Advanced EPR Methods to Study Molecular Macrosystems, Containing Electron Spins 先进EPR方法在含电子自旋分子宏观系统研究中的应用
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-19 DOI: 10.1007/s00723-026-01861-9
Elena Bagryanskaya
{"title":"The Application of Advanced EPR Methods to Study Molecular Macrosystems, Containing Electron Spins","authors":"Elena Bagryanskaya","doi":"10.1007/s00723-026-01861-9","DOIUrl":"10.1007/s00723-026-01861-9","url":null,"abstract":"<div><p>This review highlights the research achievements recognized by Zavoisky Award 2023. It summarizes results obtained over the past fifteen years using pulsed electron paramagnetic resonance (EPR) spectroscopy, conducted at the N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry (NIOCh SB RAS) in collaboration with Institute of Russian Academy of Sciences and international partners. A central focus is the development and application of highly stable nitroxide- and triarylmethyl (TAM) radical-based spin labels and probes, synthesized at NIOCH SB RAS, to address a range of fundamental biophysical problems. The last trends in development of pulse dipolar EPR spectroscopy and its application to study biomolecules are also shortly considered.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SPIRiT Regularization: Parallel MRI with a Combination of Sensitivity Encoding and Linear Predictability SPIRiT正则化：结合灵敏度编码和线性可预测性的并行MRI
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-19 DOI: 10.1007/s00723-026-01862-8
Nicholas Dwork, Alex McManus, Stephen Becker, Gennifer T. Smith
{"title":"SPIRiT Regularization: Parallel MRI with a Combination of Sensitivity Encoding and Linear Predictability","authors":"Nicholas Dwork,&nbsp;Alex McManus,&nbsp;Stephen Becker,&nbsp;Gennifer T. Smith","doi":"10.1007/s00723-026-01862-8","DOIUrl":"10.1007/s00723-026-01862-8","url":null,"abstract":"<div><p>This manuscript presents a novel combination of technologies that yield images of improved quality for accelerated Magnetic Resonance Imaging (MRI). Two established methods for accelerating MRI include <i>parallel imaging</i> and <i>compressed sensing</i>. Two types of parallel imaging include <i>linear predictability</i>, which assumes that the Fourier samples are linearly related, and <i>sensitivity encoding</i>, which incorporates <i>a priori</i> knowledge of the sensitivity maps. In this work, we combine compressed sensing with both types of parallel imaging using a novel regularization term: <i>SPIRiT regularization</i>. For a given number of samples, the images reconstructed with SPIRiT regularization are improved over those reconstructed without it. We demonstrate these improvements on data of a knee, a brain, and an ankle.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ODMR Caused by Multimode Andreev Reflection in Silicon Nanostructures 硅纳米结构中多模Andreev反射引起的ODMR
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-18 DOI: 10.1007/s00723-026-01860-w
N. T. Bagraev, L. E. Klyachkin, A. M. Malyarenko
{"title":"ODMR Caused by Multimode Andreev Reflection in Silicon Nanostructures","authors":"N. T. Bagraev,&nbsp;L. E. Klyachkin,&nbsp;A. M. Malyarenko","doi":"10.1007/s00723-026-01860-w","DOIUrl":"10.1007/s00723-026-01860-w","url":null,"abstract":"<div><p>We study the processes of persistent nondissipative carrier transport in silicon nanostructures containing the dipole boron centers with the negative correlation energy (negative-U). Recording electroluminescence spectra caused by the multiple Andreev reflection (MAR) under the gate voltage conditions stimulating MAR spin-flip transitions between chains of the dipole negative-U boron centers allows to study the stability of nondissipative transport and use MAR to develop new approaches to multimode ODMR measured by the electroluminescence spectra. Spin-dependent transitions of single carriers between chains of the negative-U dipole centers are also revealed by changes in the residual magnetic field because of the Overhauser effect that results from the hyperfine interactions with the <sup>29</sup>Si nuclei of the silicon lattice. To achieve this, the electromagnetic induction method is used to study the interrelationship between the influence of the negative-U correlation gap and the residual magnetic field on the MAR characteristics.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Translational and Reorientational Mobility of Ions in the “BMPyrrTFSI–LithiumTFSI” System According to NMR Data 基于核磁共振数据的“BMPyrrTFSI-LithiumTFSI”体系中离子的平移和重定向迁移率
IF 1.3 4区 物理与天体物理
Applied Magnetic Resonance Pub Date : 2026-07-16 DOI: 10.1007/s00723-026-01859-3
Konstantin V. Tyutyukin, Alexandr V. Ievlev, Oscar Cabeza, Luis M. Varela, Vladimir V. Chizhik
{"title":"Translational and Reorientational Mobility of Ions in the “BMPyrrTFSI–LithiumTFSI” System According to NMR Data","authors":"Konstantin V. Tyutyukin,&nbsp;Alexandr V. Ievlev,&nbsp;Oscar Cabeza,&nbsp;Luis M. Varela,&nbsp;Vladimir V. Chizhik","doi":"10.1007/s00723-026-01859-3","DOIUrl":"10.1007/s00723-026-01859-3","url":null,"abstract":"<div><p>A detailed NMR study of translational and reorientation mobility in mixtures of [BMPyrrTFSI] with [LiTFSI] (0; 0.1 and 1.5 mol/kg) was carried out in the temperature range of 278 K ≤ T ≤ 333 K. To realize the NMR advantage, the resonances of the <sup>1</sup>H, <sup>13</sup>C, <sup>7</sup>Li, and <sup>19</sup>F nuclei were registered. The diffusion data clearly indicate a strong correlation of the translational motion of all ions in the studied objects at all used temperatures. On the basis of the data obtained, the activation energies, <span>({E}_{a})</span>, for translational motion have also been calculated. The energy barriers for the translational diffusion of the IL cations and anions are close, but for the movement of the Li<sup>+</sup> cations, the activation energy <span>({E}_{a})</span> is significantly greater. It follows that the lithium cation moves together with the solvate shell of a certain number of anions. To investigate the local mobility, the temperature dependences of the spin–lattice relaxation rates in the studied systems were measured. A comparison of the activation energy values calculated from diffusion and NMR-relaxation data indicates that the energy barriers for the translational motion of ions in the system under study are much higher than for local reorientation processes. The data obtained confirm the conclusion that there is a strong solvate shell (big <span>({tau}_{c})</span>) around lithium cations.</p></div>","PeriodicalId":469,"journal":{"name":"Applied Magnetic Resonance","volume":"57 8","pages":""},"PeriodicalIF":1.3,"publicationDate":"2026-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148459111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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