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Physica B+C最新文献

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On the effect of Landau damping in a relativistic electron acoustic plasma 朗道阻尼对相对论性电子声等离子体的影响
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90308-7
A.Roy Chowdhury, Govinda Pakira, S.N. Paul
{"title":"On the effect of Landau damping in a relativistic electron acoustic plasma","authors":"A.Roy Chowdhury,&nbsp;Govinda Pakira,&nbsp;S.N. Paul","doi":"10.1016/0378-4363(88)90308-7","DOIUrl":"10.1016/0378-4363(88)90308-7","url":null,"abstract":"<div><p>We have considered the effect of damping generated due to streaming electrons in a relativistic electron plasma. It is observed that due to the relativistic effect the amplitude of the soliton gets smaller and it becomes more widened. But for a high-temperature electron plasma, the effect is not considerable. The KdV equation with the damping term is solved via the Bogoliubov-Krylov perturbation theory, whence the amplitude and width of the soliton are expressed in terms of the parameters of the plasma. Lastly we discuss how higher order effects can be incorporated.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 518-526"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90308-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90960705","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: 10
Evidence for Cu3+ in YBa2Cu3O7−δ from ESR measurements: A reassessment 来自ESR测量的YBa2Cu3O7−δ中Cu3+的证据:重新评估
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90306-3
M.D. Sastry
{"title":"Evidence for Cu3+ in YBa2Cu3O7−δ from ESR measurements: A reassessment","authors":"M.D. Sastry","doi":"10.1016/0378-4363(88)90306-3","DOIUrl":"10.1016/0378-4363(88)90306-3","url":null,"abstract":"<div><p>Blank et al. [Physica 145B (1987) 222] in a recent letter reported Q-band ESR measurements on YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−δ</sub> suggesting the presence of 10 to 15% of Cu<sup>3+</sup>. It is shown in this article that their assignment of the ESR line at <em>g</em>=2.08 to Cu<sup>3+</sup> is incorrect. Further it is pointed out that the assignment of this line to low-spin Cu<sup>4+</sup> cannot be ruled out.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 513-514"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90306-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75660304","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
Anti-ferromagnetic correlations in UPt3 UPt3中的反铁磁相关
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90303-8
P. Frings , B. Renker , C. Vettier
{"title":"Anti-ferromagnetic correlations in UPt3","authors":"P. Frings ,&nbsp;B. Renker ,&nbsp;C. Vettier","doi":"10.1016/0378-4363(88)90303-8","DOIUrl":"10.1016/0378-4363(88)90303-8","url":null,"abstract":"<div><p>We report on polarised as well as unpolarised neutron scattering experiments on two single-crystalline samples of UPt<sub>3</sub> from different sources. Previously reported magnetic intensity, probably due to anti-ferromagnetic correlations with relatively high characteristic energies (of the order of 5–8 meV) along the <em>c</em>-axis of the hexagonal structure, was observed in both samples. However, the ratio of the magnetic intensity to the phonon intensity was found to be a factor of five less than suggested by other authors. The magnetic character of the observed scattering was unambiguously proved by means of polarised neutron scattering. Furthermore, we observed in both samples a temperature-dependent quasi-elastic response for <em>Q</em>-values in the neighbourhood of the magnetic satellite positions for the anti-ferromagnetically ordered compounds U<sub>0.95</sub>Th<sub>0.05</sub>Pt<sub>3</sub> and U(Pt<sub>0.95</sub>Pd<sub>0.05</sub>)<sub>3</sub>. This indicates anti-ferromagnetic correlations in the basal plane along the <em>a</em><sup>∗</sup>-axis in pure UPt<sub>3</sub>. Moreover, we observed in only one of the samples long-range anti-ferromagnetic order with an ordered moment of the order of 0.01μ<sub>B</sub> and a Néel temperature of about 5 K.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 499-502"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90303-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85605514","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: 15
Voltage-dependent scaling of the quantum resistance in 1D disordered systems 一维无序系统中量子电阻的电压依赖缩放
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90304-X
D. Lenstra, R.T.M. Smokers
{"title":"Voltage-dependent scaling of the quantum resistance in 1D disordered systems","authors":"D. Lenstra,&nbsp;R.T.M. Smokers","doi":"10.1016/0378-4363(88)90304-X","DOIUrl":"10.1016/0378-4363(88)90304-X","url":null,"abstract":"<div><p>We have studied the voltage-dependent scaling of the resistance in a 1D disordered system by using a new Landauer-type resistance formula. The scaling behaviour at high voltage is significantly different from the scaling law due to Anderson et al. [Phys. Rev. B 22 (1980) 3519]. The finite voltage difference between both ends of the wire leads to much better statistical behaviour (in ensemble sense) of the resistance due to self-averaging over energy. Numerical results obtained for a simple model system illustrate the typical behaviour that is expected to be of conceptual importance for real systems.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 503-508"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90304-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75853011","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
Cyclotron resonance linewidth in a two-dimensional electron gas due to phonon scattering 二维电子气体中声子散射引起的回旋共振线宽
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90302-6
P.K. Basu, C.K. Sarkar, S. Kundu
{"title":"Cyclotron resonance linewidth in a two-dimensional electron gas due to phonon scattering","authors":"P.K. Basu,&nbsp;C.K. Sarkar,&nbsp;S. Kundu","doi":"10.1016/0378-4363(88)90302-6","DOIUrl":"10.1016/0378-4363(88)90302-6","url":null,"abstract":"<div><p>Cyclotron resonance linewidths due to scattering by acoustic phonons via deformation potential and piezoelectric interaction have been calculated for a two-dimensional electron gas formed in heterojunctions. The finite extent of the wave function along the direction of quantisation and screening due to free carriers are considered. The calculated linewidth for scattering due to deformation potential acoustic phonons show a <span><math><mtext>B</mtext><msup><mi></mi><mn><mtext>1</mtext><mtext>2</mtext></mn></msup></math></span> variation with magnetic field. The field dependence of the linewidth due to piezoelectric phonon scattering is however weaker.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 494-498"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90302-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78036053","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
Enthalpies of formation of liquid and solid binary alloys based on 3d metals 基于三维金属的液态和固态二元合金的生成焓
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90296-3
A.K. Niessen, A.R. Miedema, F.R. de Boer, R. Boom
{"title":"Enthalpies of formation of liquid and solid binary alloys based on 3d metals","authors":"A.K. Niessen,&nbsp;A.R. Miedema,&nbsp;F.R. de Boer,&nbsp;R. Boom","doi":"10.1016/0378-4363(88)90296-3","DOIUrl":"10.1016/0378-4363(88)90296-3","url":null,"abstract":"<div><p>Continuing the papers on alloys of Sc, Ti, V, Cr, Mn and Fe we review in the present paper, on the basis of the model developed by Miedema and co-workers, experimental and predicted enthalpies of formation of ordered binary intermetallic compounds of Co with arbitrary metal partners. The enthalpy effects are also reviewed for liquid Co alloys.</p><p>The predicted values agree quite satisfactorily with the available experimental data for binary systems of Co with a transition metal. In the binary systems where Co is alloyed with a non-transition metal larger differences are sometimes observed.</p><p>Since Co with other transition metals may often form solid solutions the enthalpy of forming solid solutions is dealt with in a concise way distinguishing between magnetic and non-magnetic matrix metals.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 401-432"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90296-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86027735","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: 162
Theory of FeCl2 metamagnet FeCl2超磁体理论
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90300-2
Z. Onyszkiewicz, A. Wierzbicki
{"title":"Theory of FeCl2 metamagnet","authors":"Z. Onyszkiewicz,&nbsp;A. Wierzbicki","doi":"10.1016/0378-4363(88)90300-2","DOIUrl":"10.1016/0378-4363(88)90300-2","url":null,"abstract":"<div><p>Two-sublattice collinear Heisenberg-Ising (<em>S</em> = 1) metamagnets with uniaxial three-ion anisotropy are investigated. Thermodynamical properties of this model are examined in the approximation including Gaussian fluctuations of the molecular field. The complete phase diagrams are obtained numerically. The theoretical results fitted for the FeCl<sub>2</sub> metamagnet are compared with experimental ones.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 475-482"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90300-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83000334","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
Mass attenuation coefficients of beta particles in 4π geometry 4π几何中β粒子的质量衰减系数
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90311-7
R. Nathuram, G. Subrahmanian, S.R. Thontadarya
{"title":"Mass attenuation coefficients of beta particles in 4π geometry","authors":"R. Nathuram,&nbsp;G. Subrahmanian,&nbsp;S.R. Thontadarya","doi":"10.1016/0378-4363(88)90311-7","DOIUrl":"10.1016/0378-4363(88)90311-7","url":null,"abstract":"<div><p>The mass attenuation coefficients μ/ϱ of beta particles of end point energy <em>E</em><sub>0</sub> ranging from 0.16–2.3 MeV are determined adopting a 4π geometrical configuration, where the source is sandwiched between thin foils of aluminium as absorbers and the sandwich is kept in a 4π gas flow proportional counter for measuring transmitted beta particles. An empirical relation connecting μ/ϱ and <em>E</em><sub>0</sub> is determined in such a geometrical configuration for the first time. The estimated values of μ/ϱ in this geometry are discussed and compared with published values, obtained by employing various other types of geometry.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 547-551"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90311-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84713638","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
Analytic subject index 分析主题索引
Physica B+C Pub Date : 1988-08-01 DOI: 10.1016/0378-4363(88)90314-2
{"title":"Analytic subject index","authors":"","doi":"10.1016/0378-4363(88)90314-2","DOIUrl":"https://doi.org/10.1016/0378-4363(88)90314-2","url":null,"abstract":"","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 574-585"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90314-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137058729","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
Does measurement reverse the direction of intrinsic time? 测量会改变固有时间的方向吗?
Physica B+C Pub Date : 1988-07-01 DOI: 10.1016/0378-4363(88)90182-9
Iwo Bialynicki-Birula
{"title":"Does measurement reverse the direction of intrinsic time?","authors":"Iwo Bialynicki-Birula","doi":"10.1016/0378-4363(88)90182-9","DOIUrl":"10.1016/0378-4363(88)90182-9","url":null,"abstract":"<div><p>A new interpretation of the formula for transition probabilities in quantum theory is proposed, based on the relativistic version of the Feynman path integral. According to this interpretation both the transition amplitude and its complex conjugate are treated on equal footing. They differ only in having opposite directions of the intrinsic time. It is conjectured that both processes, the one that corresponds to the amplitude and the one that corresponds to the complex conjugate amplitude, are equally real and that they both take place in space-time. Every time a measurement occurs, the direction of the intrinsic time is reversed. In this formulation the dilemma faced by Schrödinger in 1926, which sign of i to choose in the wave equation, does not arise.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 1","pages":"Pages 302-305"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90182-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75875280","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
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