Physica B-condensed Matter最新文献

{"title":"A self-powered UV photodetector based on a β-Ga2O3/p-GaN p-n heterojunction fabricated via magnetron sputtering","authors":"Jiaxin Liu ,&nbsp;Guojiao Xiang ,&nbsp;Xian Zhang ,&nbsp;Shuaikang Wei ,&nbsp;Zhiang Yue ,&nbsp;Meibo Xin ,&nbsp;Fujing Dong ,&nbsp;Xiaosheng Guo ,&nbsp;Minyi Huang ,&nbsp;Yang Zhao ,&nbsp;Hui Wang","doi":"10.1016/j.physb.2024.416685","DOIUrl":"10.1016/j.physb.2024.416685","url":null,"abstract":"<div><div>In recent years, self-powered ultraviolet photodetectors have attracted significant attention worldwide, driven by the growing demand in both military and civilian sectors. In this study, β-Ga₂O₃ thin films with controllable quality were grown using the magnetron sputtering method. Furthermore, a self-powered UV photodetector based on a β-Ga₂O₃/p-GaN heterojunction was successfully fabricated. The photodetector exhibited a responsivity of R₂₅₄ = 0.11 A/W and R₃₆₅ = 0.04 A/W under 254 nm and 365 nm illumination, respectively, with fast response times under zero bias (rise/decay times of 0.74/0.5 s and 0.73/0.24 s). It demonstrated excellent switching characteristics at 0 V bias and varied photocurrent gains under different applied biases. This work validates the controlled growth method for β-Ga₂O₃ thin films and provides an effective approach for developing self-powered UV detectors with low dark current and high stability.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416685"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Effect of O vacancy and different-valence interstitial H on the magnetic and optical properties of β-Ga2O3: Mo5+/6+","authors":"Xia Liu,&nbsp;Shu-min Wen,&nbsp;Ding-du Chen,&nbsp;Wei Wang,&nbsp;Er-jun Zhao","doi":"10.1016/j.physb.2024.416680","DOIUrl":"10.1016/j.physb.2024.416680","url":null,"abstract":"<div><div>There are some reports about the research on Mo-doped β-Ga₂O₃. However, the effects of resulting from diverse valence states Mo doping and coexistence of O vacancy and interstitial H on the magneto-optical properties of β-Ga₂O₃ have been neglected. So, the magneto-optical properties of Mo-doped β-Ga₂O₃ with different valence states were studied by using GGA + U approach. The influence of O vacancy and interstitial H in different valence states on the system properties is also considered. The electronic structure, magnetic properties, and optical properties of all the systems are studied and analyzed. The findings indicate that except for O vacancy, the bandgaps of all doping systems become narrower. Among all the doping systems, the Mo⁵⁺ doping system exhibits magnetic properties, and the Ga₄₇O₇₂Mo₁⁶⁺H₁¹⁺ system demonstrates the largest electric dipole moment and the strongest carrier activity. Within the wavelength range of 210–280 nm, Ga₄₇O₇₂Mo₁⁵⁺H₁⁰ manifests the highest absorption intensity and the most significant redshift.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416680"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"The effect of resonance on qudit dynamics","authors":"L.E. Reichl","doi":"10.1016/j.physb.2024.416642","DOIUrl":"10.1016/j.physb.2024.416642","url":null,"abstract":"<div><div>When the wave nature of particles plays a role in their scattering dynamics, quasi-bound states in the positive energy continuum can have a huge impact on their dynamics. This effect has been observed in nuclear scattering processes and molecular reaction dynamics. We here examine the effect of quasibound state formation in a quantum gate, and its impact on the dynamics of qudits that pass through the quantum gate. The analysis is performed using reaction matrix (R-matrix) theory, with Dirichlet boundary conditions. R-matrix theory obtains results much more efficiently than more computationally demanding methods such as mode matching techniques, tight binding Green’s function methods, or finite element methods.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416642"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Irreversible remagnetisation processes in nano- and microstructured Nd-Fe-B alloys at low temperatures","authors":"D.S. Neznakhin ,&nbsp;A.M. Bartashevich ,&nbsp;A.S. Volegov ,&nbsp;S.V. Andreev ,&nbsp;N.V. Kudrevatykh","doi":"10.1016/j.physb.2024.416688","DOIUrl":"10.1016/j.physb.2024.416688","url":null,"abstract":"<div><div>The low temperature magnetisation jumps have been observed and studied in nano- and microstructured alloys based on the Nd₂Fe₁₄B phase. “Barkhausen-like” jumps can be explained in terms of the two-stage trigger/propagation model. Magnetisation jumps cause the internal parts of the sample to heat up to a critical temperature. This is a temperature at which no magnetisation jumps are observed on the remagnetisation curve. Magnetisation jumps can be activated in some samples by their local heating with electric current pulses. When magnetic alloy powder was placed in a nonmagnetic matrix, increasing the average distance between ferromagnetic particles, the number of magnetisation jumps decreased. The remagnetisation mechanism in alloys changes from a two-stage trigger/propagation process, which occurs in the nanostructured samples, to a thermal activation process, which occurs in the microstructured samples. The increase in grain size leads to a decrease in the critical temperature value at which magnetisation jumps can be observed.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416688"},"PeriodicalIF":2.8,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Iron telluride Fe1.1Te doped with TiS2 and NbS2: Appearance of superconducting state coexisting with antiferromagnetism","authors":"E. Kislov ,&nbsp;A.P. Yesina ,&nbsp;N.V. Selezneva ,&nbsp;E.M. Sherokalova ,&nbsp;A.S. Volegov ,&nbsp;D.K. Kuznetsov ,&nbsp;N.V. Baranov","doi":"10.1016/j.physb.2024.416682","DOIUrl":"10.1016/j.physb.2024.416682","url":null,"abstract":"<div><div>The effect of titanium or niobium disulfides doping of iron telluride has been studied for the first time by means of x-ray diffraction analysis, electrical resistivity and magnetization measurements. It has been revealed that an increase in the dopant content in the Fe_1.1Te(<em>T</em>S₂)_<em>y</em> (<em>T</em> = Ti, Nb) systems (<em>y</em> = 0, 0.04, 0.08, 0.1, 0.2) is accompanied by the additional phase separation and leads to a decrease in the crystal lattice parameters of the tetragonal phase, partial suppression of antiferromagnetic ordering and an appearance of superconductivity. In doped samples a transition to the superconducting state has been detected upon cooling below <em>T</em>_c^onset ∼9 K coexisting with antiferromagnetism. Superconductivity is suggested to exhibit a granular character due to inhomogeneity of the samples and the small volume fraction of superconducting phase. The difference in the superconducting transitions for both dopant types may be associated with different morphologies and compositions of resulting phases.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416682"},"PeriodicalIF":2.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Demonstration of bipolar resistive memory fabricated using an ultra-thin BaTiOx resistive switching layer with a thickness of ∼5 nm","authors":"Chih-Chieh Hsu ,&nbsp;Wen-Chin Wu ,&nbsp;Zheng-Kai Xiao ,&nbsp;Wun-Ciang Jhang ,&nbsp;Zi-Rong Qiu ,&nbsp;Sungjun Kim","doi":"10.1016/j.physb.2024.416681","DOIUrl":"10.1016/j.physb.2024.416681","url":null,"abstract":"<div><div>In this study, a high-performance non-volatile bipolar resistive random-access memory (RRAM), which was fabricated using an ultra-thin barium titanate (BaTiO_x, BTO) film as a resistive switching (RS) layer, was demonstrated. The BTO RS layers, whose thicknesses were only about 5 nm, were prepared using radio-frequency sputtering under different oxygen flow rates. Introduction of oxygen was used to modify the chemical compositions of the BTO films. Copper was used as the top electrode material to realize a Cu/BTO/n⁺-Si electrochemical metallization memory, where the resistance switching was triggered by electrochemical reaction of Cu electrode. The RRAM could repeatedly and consistently switch between a high-resistance state and a low-resistance state over 300 cycles. A large memory window of 10⁵ and a long data retention time of &gt;1.5 × 10⁴ s both at room temperature and 85 °C were observed. Moreover, the Cu/BTO/n⁺-Si RRAM showed high switching speeds of 60–70 ns.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416681"},"PeriodicalIF":2.8,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"High-Q triple-mode quasi-bound states in the continuum in an asymmetric dielectric metamaterial","authors":"Xiangjin Chen ,&nbsp;Huan Jiang ,&nbsp;Bingying Chen ,&nbsp;Huilin Mo ,&nbsp;Chaobiao Zhou","doi":"10.1016/j.physb.2024.416679","DOIUrl":"10.1016/j.physb.2024.416679","url":null,"abstract":"<div><div>Bound states in the continuum (BICs) in metamaterials have attracted much attention due to their high efficiency in field enhancing. In this paper, we numerically demonstrated the triple-mode symmetry-protected BICs (SP-BICs) in an all-dielectric microtube metamaterial. By moving the hollows transversely and longitudinally in microtubes, three SP-BICs are transformed into high quality-factor (Q-factor) quasi-BICs (q-BICs), which are supported by asymmetric magnetic toroidal dipole electric hexapolar resonances respectively. The maximum Q-factor of q-BICs enabled by asymmetric magnetic toroidal dipole reaches 67647. This high Q-factor triple-mode q-BICs in all-dielectric microtube metamaterial has great potential in the applications of sensing, laser generation, and nonlinear optics.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416679"},"PeriodicalIF":2.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Temperature and frequency effect on charge transport in Pr0.5Ca0.5MnO3","authors":"Kamran Shahzad ,&nbsp;Matiullah Shah ,&nbsp;M. Rahim ,&nbsp;Khurram Shehzad ,&nbsp;M. Nadeem ,&nbsp;K. Mehmood ,&nbsp;M. Atif ,&nbsp;Anas Ramzan ,&nbsp;Uzma Ghazanfar ,&nbsp;B. Maryam ,&nbsp;Q. Ain","doi":"10.1016/j.physb.2024.416665","DOIUrl":"10.1016/j.physb.2024.416665","url":null,"abstract":"<div><div>The polycrystalline ceramic manganite Pr_0.5Ca_0.5MnO₃ has been synthesized with conventional solid-state reaction route and its structural, magnetic and electrical behavior was explored experimentally in terms of change in thermoelectric and magnetic properties around a specific temperature. Structural investigation through XRD confirms that sample is single phase. Magnetic study reveals that the sample is charge ordered manganite (CO ≈ 250 K). The Magnetic behavior show alignment of Mn spins due to ferromagnetic behavior at 148 K (T_C). Furthermore, in M(H) curve, a non-linear conduct was observed around 220 K and magnetic moment alignment is argued with respect to temperature. The response of applied frequency, using impedance spectroscopy, was studied for change in relaxation progressions. Equivalent circuit model (RQ) was implemented for getting impedance values. These impedance values helped us for determining the resistance and capacitance of grain and grain boundaries. Using calculated electrical features for a range of temperatures confirmed a variation in the conduction system at T_C = 148 K, using small polaronic hopping model (SPH) and in light of Mott's variable range hopping model (MVRH). With MVRH, it is also discussed that carriers would hop to large distance with the help of activation energy below T_C and above this these carriers are being facilitated by various trap centers via SPH. Dispersion around 148 K in dielectric relaxation and one sort of polarization is close to relaxation calculated from grain boundaries.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416665"},"PeriodicalIF":2.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Influence of substrate temperature and Mn/Y co-doping concentration on the morphological, structural and optical properties of CuO nanostructured film deposited by the spray pyrolysis method","authors":"Balen Hussein ,&nbsp;Arife Gencer Imer ,&nbsp;Murat Aycibin","doi":"10.1016/j.physb.2024.416674","DOIUrl":"10.1016/j.physb.2024.416674","url":null,"abstract":"<div><div>In this work, the effect of substrate temperature (ST) during deposition and dopant amount of Mn (1,3,5, and 7 %) and Y(3 %), (Mn/Y), on the physical properties of copper oxide (CuO) the nanostructured film were analyzed using different diagnostic tools. The pure and (Mn, Y) co-doped CuO thin films were deposited by the spray pyrolysis method, which is effective and easy to apply for any substrate. Deposited pure and (Mn,Y) co-doped CuO nanostructured films were investigated by X-ray diffraction (XRD), UV–Vis spectroscopy, and Field emission scanning electron microscopy (FESEM) techniques to analyze the influence of ST and co-doping on the structural, morphological, and optical properties of prepared films. The FESEM is used to visualize nanostructures on the surface of the film. Also, it is observed that the surface morphology of CuO film changes from a spherical-like to a nanocloumnar-like structure with increasing substrate temperature. The XRD diffractograms confirm the monoclinic crystal structure of CuO, in polycrystalline nature for all deposited films. UV–Vis spectra suggest changing the optical absorbance and the band gap of the pure and Mn/Y co-doped CuO nanostructured films. In the first investigation of this study, the better substrate temperature was obtained as 400 °C according to results. In the second part, the effect of Y and Mn doping with different content was analyzed for the CuO film deposited at the chosen ST of 400 °C. There is no observable crystalline structure variation in the XRD pattern, but the size of nanostructure and dislocation density are varied with Mn/Y co-doping. FESEM micrographs confirm the impact of the co-doping concentration on the size, shape, and surface properties of CuO nanostructured film. In addition, the optical band gap increases with Mn doping up to 3 % of Mn content and it was determined as 2.69 eV for the sample 3Mn/Y@CuO nanostructured film. The obtained results suggest that the substrate temperature has an important impact on the physical properties of the spray deposited CuO nanostructured film, and the structural, optical, and surface properties of the CuO nanostructured films may be engineered by Mn/Y doping concentration.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"696 ","pages":"Article 416674"},"PeriodicalIF":2.8,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"The effect of Yb content on the dielectric properties of TlIn0,99Yb0,01S2 thin films","authors":"Meriem Bikirova ,&nbsp;Sahin Yakut ,&nbsp;Deniz Bozoglu ,&nbsp;Kemal Ulutas ,&nbsp;Pakize Ismailova ,&nbsp;Ayten Hacıyeva ,&nbsp;Anar Hasanov ,&nbsp;Deniz Deger","doi":"10.1016/j.physb.2024.416673","DOIUrl":"10.1016/j.physb.2024.416673","url":null,"abstract":"<div><div>This paper investigated the impact of ytterbium content on the dielectric properties of TlInS₂ and TlIn_(0,99₎Yb_(0,₀₁₎S₂ thin films with varying thicknesses. The dielectric properties of the thin films were analyzed using dielectric spectroscopy across a frequency range of 1 Hz to 1 MHz and a temperature range of 213 K–373 K. The XRD analysis was used to obtain the structural information of TlInS₂ and TlIn_(0,99₎Yb_(0,0₁₎S₂ thin films. A comprehensive dielectric analysis of TlInS₂ and TlIn_(0,99₎Yb_(0,0₁₎S₂ thin films was presented. Using the Cole-Cole equation, It demonstrated that the thin films are electrically heterogeneous structures displaying a non-Debye behavior depending on temperature. The finding indicates that the free volume increases with increasing thicknesses due to the presence of Yb with a greater atomic radius than TlIn_(0,99₎Yb_(0,0₁₎S₂ thin films. This study shows that even a small amount of Yb significantly impacts the dielectric properties of both films with the same thicknesses, thereby expanding its potential technological applications.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416673"},"PeriodicalIF":2.8,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142661751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}