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Effect of Interfaces on Dielectric Relaxation in La0.35Sr0.6MnO3 -YSZ 界面对La0.35Sr0.6MnO3 -YSZ介质弛豫的影响
Australian Journal of Physics Pub Date : 2000-10-15 DOI: 10.1071/PH00049
Xia Zheng-cai, Tang Chao-qun, Zhou Dong-xiang, Yang Jian-hui
{"title":"Effect of Interfaces on Dielectric Relaxation in La0.35Sr0.6MnO3 -YSZ","authors":"Xia Zheng-cai, Tang Chao-qun, Zhou Dong-xiang, Yang Jian-hui","doi":"10.1071/PH00049","DOIUrl":"https://doi.org/10.1071/PH00049","url":null,"abstract":"The perovskite structure material La 0.35 Sr 0.6 MnO 3 was sintered in air and the mixed ceramic of a 0.35 Sr 0.6 MnO 3 and 8 mol % Y 2 O 3 +ZrO 2 with a 1:1 mass rate was also sintered in air, both at 1530 K for 12 hour. The AC complex impedance spectra have been measured and the effect of the interface between La 0.35 Sr 0.6 MnO 3 and YSZ on dielectric relaxation properties of La 0.35 Sr 0.6 MnO 3 has been investigated. A schematic of diffusion phase formation and the equivalent circuits are proposed for explaining the results. In the complex impedance spectra, the first and second semicircles correspond to the grain-boundary and interface respectively. The results show that the dielectric relaxation properties and structure of the mixed ceramic are different to that of single phase La 0.35 Sr 0.6 MnO 3 . The interface has an important effect on the electric properties of the mixed ceramic and produces a dielectric relaxation in low frequency.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124712814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optical Multistability from a Squeezed Vacuum in the Presence of Quantum Interference 存在量子干涉的压缩真空中的光学多稳定性
Australian Journal of Physics Pub Date : 2000-10-15 DOI: 10.1071/PH99094
C. Du, Shiqun Li
{"title":"Optical Multistability from a Squeezed Vacuum in the Presence of Quantum Interference","authors":"C. Du, Shiqun Li","doi":"10.1071/PH99094","DOIUrl":"https://doi.org/10.1071/PH99094","url":null,"abstract":"The effect of a squeezed vacuum on the optical bistable and multistable behaviour of a system of N three-level atoms is investigated, where the quantum interference between the atomic transition paths is considered. It is shown that the squeezed vacuum can profoundly affect the output field of this system. A strong squeezed vacuum can lead to multistable behaviour, even in the case where the cooperation parameter C is so small that the input–output relationship curve is monotone in the absence of the squeezed vacuum. The optical multistability is most significant when the quantum interference is perfect. The bistability and multistability can be controlled by the squeezing photon number and the strength of the two-photon correlation.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123849255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ro-vibrational Transition Energies and Absorption Intensities of the 1A1 States of H2O, He2O2+ and He2S2+ H2O、He2O2+和He2S2+ 1A1态的反振动跃迁能和吸收强度
Australian Journal of Physics Pub Date : 2000-10-15 DOI: 10.1071/PH00027
J. M. H. Sudarko, E. I. Nagy-Felsobuki
{"title":"Ro-vibrational Transition Energies and Absorption Intensities of the 1A1 States of H2O, He2O2+ and He2S2+","authors":"J. M. H. Sudarko, E. I. Nagy-Felsobuki","doi":"10.1071/PH00027","DOIUrl":"https://doi.org/10.1071/PH00027","url":null,"abstract":"Variational ro–vibrational wave functions are calculated using an Eckart–Watson Hamiltonian, which has embedded an ab initio potential energy function. These wave functions, together with an ab initio dipole moment function, are employed to predict transition energies and absorption intensities. The radiative transition probability integrals are determined using a novel adaptation of the Harris–Engerholm–Gwinn integration scheme. The method and solution algorithm yields results in excellent agreement with previously determined experimental and theoretical electric dipole allowed transitions for the 1 A 1 ground state of H 2 O. The method has also been applied to the 1 A 1 states of the helide analogs of water, namely He 2 O 2+ and He 2 S 2+ , in order to predict their ro–vibrational transition energies and absorption intensities, thereby facilitating their possible interstellar detection.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125959109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Microwave Absorption in Layered Media: Application to Landmine Detection 层状介质中的微波吸收:在地雷探测中的应用
Australian Journal of Physics Pub Date : 2000-10-15 DOI: 10.1071/PH00001
J. Hermann
{"title":"Microwave Absorption in Layered Media: Application to Landmine Detection","authors":"J. Hermann","doi":"10.1071/PH00001","DOIUrl":"https://doi.org/10.1071/PH00001","url":null,"abstract":"The absorption of microwave radiation and subsequent thermal conduction by simple composite media, consisting of parallel layers with disparate thermal properties,is analysed.The solutions for a one-dimensional conduction model are used to investigate the time evolution and distribution of thermal energy within moisture-laden soils containing non-absorbing objects.The application of these results to the detection of landmines is discussed and evaluated.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123642146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Position Indeterminacy in Ortho-positronium Decay 正交正电子衰变中的位置不确定性
Australian Journal of Physics Pub Date : 2000-10-15 DOI: 10.1071/PH00028
F. Ruzzene
{"title":"Position Indeterminacy in Ortho-positronium Decay","authors":"F. Ruzzene","doi":"10.1071/PH00028","DOIUrl":"https://doi.org/10.1071/PH00028","url":null,"abstract":"Position indeterminacy contributions to the decay width of ortho-positronium (o-Ps)are calculated for lowest order. Contributions improve agreement between theory and the Ann Arbor group measurements, while suggesting a value larger than that of the Tokyo group.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"83 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120896932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Quenching of the 2D Metallic State by Aligning the Electron Spins 对准电子自旋对二维金属态的猝灭
Australian Journal of Physics Pub Date : 2000-08-15 DOI: 10.1071/PH00022
J. Thakur, D. Neilson
{"title":"Quenching of the 2D Metallic State by Aligning the Electron Spins","authors":"J. Thakur, D. Neilson","doi":"10.1071/PH00022","DOIUrl":"https://doi.org/10.1071/PH00022","url":null,"abstract":"We discuss the destabilisation of the electron 2D metallic state by an in-plane magnetic field. We demonstrate that such a field can destabilise the metallic state through spin polarisation which significantly enhances the exchange correlations between electrons. We find that the conducting phase of the fully spin polarised system is almost completely suppressed. We discuss this phenomenon within a memory function formalism which treats both disorder and exchange-correlation effects. We determine the shift in the position of the metal–insulator phase boundary as the system is polarised by an increasing parallel magnetic field.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125459530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum Measurement and Stochastic Processes in Mesoscopic Conductors 介观导体中的量子测量和随机过程
Australian Journal of Physics Pub Date : 2000-08-15 DOI: 10.1071/PH00003
G. Milburn
{"title":"Quantum Measurement and Stochastic Processes in Mesoscopic Conductors","authors":"G. Milburn","doi":"10.1071/PH00003","DOIUrl":"https://doi.org/10.1071/PH00003","url":null,"abstract":"In quantum measurement theory it is necessary to show how a, quantum source conditions a classical stochastic record of measured results. We discuss mesoscopic conductance using quantum stochastic calculus to elucidate the quantum nature of the measurement taking place in these systems. To illustrate the method we derive the current fluctuations in a two terminal mesoscopic circuit with two tunnel barriers containing a single quasi bound state on the well. The method enables us to focus on either the incoming/ outgoing Fermi fields in the leads, or on the irreversible dynamics of the well state itself. We show an equivalence between the approach of Buttiker and the Fermi quantum stochastic calculus for mesoscopic systems.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132513637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Absorptive Quantum Measurements via Coherently Coupled Quantum Dots 相干耦合量子点吸收量子测量
Australian Journal of Physics Pub Date : 2000-08-15 DOI: 10.1071/PH00034
G. Milburn, H. Sun, B. Upcroft
{"title":"Absorptive Quantum Measurements via Coherently Coupled Quantum Dots","authors":"G. Milburn, H. Sun, B. Upcroft","doi":"10.1071/PH00034","DOIUrl":"https://doi.org/10.1071/PH00034","url":null,"abstract":"We propose an absorptive measurement scheme via coupled quantum dots based on studies of the quantum dynamics of coherently coupled dots. The system is described through a Markov master equation that is related to a measurable quantity, the current. We analyse the measurement configuration and calculate the correlations and noise spectra beyond the adiabatic approximation.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129721467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
General Gauge Independence of Diamagnetism plus Paramagnetism 抗磁性和顺磁性的通用表独立性
Australian Journal of Physics Pub Date : 2000-08-15 DOI: 10.1071/PH99098
A. Stewart
{"title":"General Gauge Independence of Diamagnetism plus Paramagnetism","authors":"A. Stewart","doi":"10.1071/PH99098","DOIUrl":"https://doi.org/10.1071/PH99098","url":null,"abstract":"With the use of the generalised multipolar gauge, a completely general proof is obtained for a result asserted by J. H. Van Vleck in 1932 but never fully proved by him. Specifically it is demonstrated that the matrix elements of the magnetic moment operator are independent of the origin of the vector potential for electromagnetic fields that are non-uniform in space and non-constant in time. A general survey of the principles of the quantum mechanics of solid state and molecular magnetism is also given to set the problem in its context. Based on the multipolar gauge, a simple conversion of the interaction Hamiltonian from the form of A.p to E.r plus higher order terms is demonstrated.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"282 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116087667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Many-body Spin Interactions in Semiconductor Quantum Wires 半导体量子线中的多体自旋相互作用
Australian Journal of Physics Pub Date : 2000-08-15 DOI: 10.1071/PH00040
D. Reilly, L. Pfeiffer, G. R. Facer, K. West, A. Dzurak, B. E. Kane, R. Clarke, P. Stiles, J. O'Brien, N. Lumpkin
{"title":"Many-body Spin Interactions in Semiconductor Quantum Wires","authors":"D. Reilly, L. Pfeiffer, G. R. Facer, K. West, A. Dzurak, B. E. Kane, R. Clarke, P. Stiles, J. O'Brien, N. Lumpkin","doi":"10.1071/PH00040","DOIUrl":"https://doi.org/10.1071/PH00040","url":null,"abstract":"Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 × 2e 2 /h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra-low-disorder GaAs/AlGaAs quantum wires with nominal lengths l=0 and 2µm, fabricated from structures free of the disorder associated with modulation doping. In a direct comparision we observe structure near 0.7 × 2e 2 /h for l = 0, whereas thel = 2µm wires show structure evolving with increasing electron density to 0.5 × 2e 2 /h in zero magnetic field, the value expected for an ideal spin-split sub-band. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the 1D region.","PeriodicalId":170873,"journal":{"name":"Australian Journal of Physics","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127081047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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