arXiv: Strongly Correlated Electrons最新文献_第10页

Multiple magnetic ordering phenomena in multiferroic o−HoMnO3 多铁性o−HoMnO3中的多重磁有序现象

arXiv: Strongly Correlated Electrons Pub Date : 2020-08-04 DOI: 10.1103/physrevb.102.214423

Y. W. Windsor, Y. W. Windsor, M. Ramakrishnan, Laurenz Rettig, Laurenz Rettig, A. Alberca, T. Lippert, C. Schneider, U. Staub

{"title":"Multiple magnetic ordering phenomena in multiferroic \u0000o−HoMnO3","authors":"Y. W. Windsor, Y. W. Windsor, M. Ramakrishnan, Laurenz Rettig, Laurenz Rettig, A. Alberca, T. Lippert, C. Schneider, U. Staub","doi":"10.1103/physrevb.102.214423","DOIUrl":"https://doi.org/10.1103/physrevb.102.214423","url":null,"abstract":"Orthorhombic HoMnO3 is a multiferroic in which Mn antiferromagnetic order induces ferroelectricity. A second transition occurs within the multiferroic phase, in which a strong enhancement of the ferroelectric polarization occurs concomitantly to antiferromagnetic ordering of Ho 4f magnetic moments. Using the element selectivity of resonant X-ray diffraction, we study the magnetic order of the Mn 3d and Ho 4f moments. We explicitly show that the Mn magnetic order is affected by the Ho 4f magnetic ordering transition. Based on the azimuthal dependence of the (0 q 0) and (0 1-q 0) magnetic reflections, we suggest that the Ho 4f order is similar to that previously observed for Tb 4f in TbMnO3, which resembles an ac-cycloid. This is unlike the Mn order, which has already been shown to be different for the two materials. Using non-resonant diffraction, we show that the magnetically-induced ferroelectric lattice distortion is unaffected by the Ho ordering, suggesting a mechanism through which the Ho order affects polarization without affecting the lattice in the same manner as the Mn order.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84458049","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

Skyrmions in twisted van der Waals magnets 扭曲范德华磁体中的Skyrmions

arXiv: Strongly Correlated Electrons Pub Date : 2020-08-04 DOI: 10.1103/PHYSREVB.103.L140406

Muhammad Akram, O. Erten

引用次数: 22

Electronic structure and magnetism in infinite-layer nickelates RNiO2 (R=La−Lu) 无限层镍酸盐RNiO2 (R=La−Lu)的电子结构和磁性

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-29 DOI: 10.1103/physrevb.102.205130

Jesse Kapeghian, A. Botana

引用次数: 17

NMR study of the spin excitations in the frustrated antiferromagnet Yb(BaBO3)3 with a triangular lattice 具有三角形晶格的受挫反铁磁体Yb(BaBO3)3自旋激发的核磁共振研究

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-29 DOI: 10.1103/physrevb.102.045149

K. Zeng, Long Ma, Y. X. Gao, Z. Tian, L. Ling, L. Pi

引用次数: 6

Gapless state of interacting Majorana fermions in a strain-induced Landau level 应变诱导朗道水平下马约拉纳费米子相互作用的无间隙态

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-27 DOI: 10.1103/PHYSREVB.103.134427

A. Agarwala, S. Bhattacharjee, J. Knolle, R. Moessner

引用次数: 0

Fractionally Charged Anyon Generated by Topological Path Fusion in Magnetic Flux Lattice 磁通量晶格中拓扑路径融合产生的分数电荷任意子

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-23 DOI: 10.20944/preprints202007.0563.v1

Tieyan Si

{"title":"Fractionally Charged Anyon Generated by Topological Path Fusion in Magnetic Flux Lattice","authors":"Tieyan Si","doi":"10.20944/preprints202007.0563.v1","DOIUrl":"https://doi.org/10.20944/preprints202007.0563.v1","url":null,"abstract":"Anyon usually exists as collective excitation of two dimensional electron gas subjected to strong magnetic field, carrying fractional charges and exotic statistical character beyond fermion and boson. Fractional quantum Hall effect (FQHE) is the only experimental system showing solid evidence of anyon and a serial of fractional charges so far. Searching for new serial of fractional charges in FQHE or other physical system is still a challenge for both theoretical and experimental study. Here a topological fusion theory of propagating paths winding around a pair of fluxes is proposed to explore the physical origin of fractional charges. This topological path fusion theory not only generated all of the existed serial of fractional charges in FQHE and found the exact correspondence between FQHE and integral quantum Hall effect (IQHE), but also predicted new serial of fractional charges in FQHE. Further more, serial irrational charges like $2/(3+sqrt{2})$ in one dimensional lattice of magnetic fluxes as well as that in two dimensional lattice of magnetic fluxes, such as $(1+sqrt{2})$, are predicted. Even in three dimensional network of magnetic fluxes, a serial of fractionally charged anyon is predicted by this topological path fusion theory, which has exactly correspondence with the knot lattice model of anyon. In fact, in a multi-connected space time without magnetic field, this topological path fusion theory still holds, revealing an universal existence of fractional charge and mass in quantum material with strong confinement of particles (such as photonic crystal with porous nano-structures) and paving a new way for topological quantum computation.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"180 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72872053","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

Study of magnetization relaxation in molecular spin clusters using an innovative kinetic Monte Carlo method 用一种创新的动力学蒙特卡罗方法研究分子自旋簇中的磁化弛豫

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-22 DOI: 10.1103/PhysRevB.103.214424

S. Haldar, S. Ramasesha

{"title":"Study of magnetization relaxation in molecular spin clusters using an innovative kinetic Monte Carlo method","authors":"S. Haldar, S. Ramasesha","doi":"10.1103/PhysRevB.103.214424","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.214424","url":null,"abstract":"Modeling blocking temperature in molecular magnets has been a long standing problem in the field of molecular magnetism. We investigate this problem using a kinetic Monte Carlo (kMC) approach on an assembly of 100,000 spin chains, each of six identical spins with nearest neighbour anisotropic exchange interactions. Each spin is also anisotropic with an axial anisotropy. The site spin on these short chains take values $1$, $3/2$ or $2$. Using eigenstates of these short chains as the states of Markov chain, we carry out a kMC simulation starting with an initial state in which all chains are completely spin polarized and assembled so as to experience ferromagnetic spin dipolar interaction with each other. From these simulations we obtain the relaxation time $tau_r$ as a function of temperature and the associated blocking temperature. We study this for different exchange anisotropy, on-site anisotropy and strength of dipolar interactions. The magnetization relaxation times show non-Arrhenius behaviour for weak on-site interactions. The energy barrier to magnetization relaxation increases with increase in on-site anisotropy, exchange anisotropy and strength of spin dipolar interactions; more strongly on the last parameter. In all cases the barrier saturates at large on-site anisotropy. The barrier also increases with site spin. The large barrier observed in rare-earth single ion magnets can be attributed to large dipolar interactions due to short intermolecular distances, owing to the small size as well as large spin on the molecules.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86386416","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

Crystalline and magnetic structures, magnetization, heat capacity, and anisotropic magnetostriction effect in a yttrium-chromium oxide 氧化钇铬的晶体和磁性结构、磁化、热容量和各向异性磁致伸缩效应

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-17 DOI: 10.1103/physrevmaterials.4.094409

Yinghao Zhu, Yingxun Fu, Bao Tu, Tao Li, J. Miao, Qian Zhao, Si Wu, J. Xia, Pengfei Zhou, A. Huq, W. Schmidt, D. Ouyang, Zikang Tang, Zhubing He, Hai-Feng Li

{"title":"Crystalline and magnetic structures, magnetization, heat capacity, and anisotropic magnetostriction effect in a yttrium-chromium oxide","authors":"Yinghao Zhu, Yingxun Fu, Bao Tu, Tao Li, J. Miao, Qian Zhao, Si Wu, J. Xia, Pengfei Zhou, A. Huq, W. Schmidt, D. Ouyang, Zikang Tang, Zhubing He, Hai-Feng Li","doi":"10.1103/physrevmaterials.4.094409","DOIUrl":"https://doi.org/10.1103/physrevmaterials.4.094409","url":null,"abstract":"We have studied a nearly stoichiometric insulating Y$_{0.97(2)}$Cr$_{0.98(2)}$O$_{3.00(2)}$ single crystal by performing measurements of magnetization, heat capacity, and neutron diffraction. Albeit that the YCrO$_3$ compound behaviors like a soft ferromagnet with a coersive force of $sim$ 0.05 T, there exist strong antiferromagnetic (AFM) interactions between Cr$^{3+}$ spins due to a strongly negative paramagnetic Curie-Weiss temperature, i.e., -433.2(6) K. The coexistence of ferromagnetism and antiferromagnetism may indicate a canted AFM structure. The AFM phase transition occurs at $T_textrm{N} =$ 141.5(1) K, which increases to $T_textrm{N}$(5T) = 144.5(1) K at 5 T. Within the accuracy of the present neuron-diffraction studies, we determine a G-type AFM structure with a propagation vector textbf{k} = (1 1 0) and Cr$^{3+}$ spin directions along the crystallographic emph{c} axis of the orthorhombic structure with space group emph{Pnma} below $T_textrm{N}$. At 12 K, the refined moment size is 2.45(6) $mu_textrm{B}$, $sim$ 82% of the theoretical saturation value 3 $mu_textrm{B}$. The Cr$^{3+}$ spin interactions are probably two-dimensional Ising like within the reciprocal (1 1 0) scattering plane. Below $T_textrm{N}$, the lattice configuration (emph{a}, emph{b}, emph{c}, and emph{V}) deviates largely downward from the Gr$ddot{textrm{u}}$neisen law, displaying an anisotropic magnetostriction effect and a magnetoelastic effect. Especially, the sample contraction upon cooling is enhanced below the AFM transition temperature. There is evidence to suggest that the actual crystalline symmetry of YCrO$_3$ compound is probably lower than the currently assumed one. Additionally, we compared the $t_{2textrm{g}}$ YCrO$_3$ and the $e_textrm{g}$ La$_{7/8}$Sr$_{1/8}$MnO$_3$ single crystals for a further understanding of the reason for the possible symmetry lowering.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89516910","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: 11

Anisotropic fractal magnetic domain pattern in bulk Mn1.4PtSn 块状Mn1.4PtSn的各向异性分形磁畴图

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-15 DOI: 10.1103/physrevb.102.174447

A. Sukhanov, B. E. Z. Cespedes, P. Vir, A. Cameron, A. Heinemann, N. Martin, G. Chaboussant, V. Kumar, P. Milde, Lukas M. Eng, Claudia Felser, D. Inosov

{"title":"Anisotropic fractal magnetic domain pattern in bulk \u0000Mn1.4PtSn","authors":"A. Sukhanov, B. E. Z. Cespedes, P. Vir, A. Cameron, A. Heinemann, N. Martin, G. Chaboussant, V. Kumar, P. Milde, Lukas M. Eng, Claudia Felser, D. Inosov","doi":"10.1103/physrevb.102.174447","DOIUrl":"https://doi.org/10.1103/physrevb.102.174447","url":null,"abstract":"The tetragonal compound Mn$_{1.4}$PtSn with the $D_{2d}$ symmetry recently attracted attention as the first known material that hosts magnetic antiskyrmions, which differ from the so far known skyrmions by their internal structure. The latter have been found in a number of magnets with the chiral crystal structure. In previous works, the existence of antiskyrmions in Mn$_{1.4}$PtSn was unambiguously demonstrated in real space by means of Lorentz transmission electron microscopy on thin-plate samples ($sim$100~nm thick). In the present study, we used small-angle neutron scattering and magnetic force microscopy to perform reciprocal- and real-space imaging of the magnetic texture of bulk Mn$_{1.4}$PtSn single-crystals at different temperatures and in applied magnetic field. We found that the magnetic texture in the bulk differs significantly from that of thin-plate samples. Instead of spin helices or an antiskyrmion lattice, we observe an anisotropic fractal magnetic pattern of closure domains in zero field above the spin-reorientation transition temperature, which transforms into a set of bubble domains in high field. Below the spin-reorientation transition temperature the strong in-plane anisotropy as well as the fractal self-affinity in zero field is gradually lost, while the formation of bubble domains in high field remains robust. The results of our study highlight the importance of dipole-dipole interactions in thin-plate samples for the stabilization of antiskyrmions and identify criteria which should guide the search for potential (anti)skyrmion host materials. Moreover, they provide consistent interpretations of the previously reported magnetotransport anomalies of the bulk crystals.","PeriodicalId":8511,"journal":{"name":"arXiv: Strongly Correlated Electrons","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73494643","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

Analysis of Magnetoacoustic Quadrupole Resonance and Application to Probe Quadrupole Degrees of Freedom in Quantum Magnets 磁声四极共振分析及其在量子磁体中四极自由度探测中的应用

arXiv: Strongly Correlated Electrons Pub Date : 2020-07-15 DOI: 10.7566/JPSJ.89.084702

M. Matsumoto, M. Koga

引用次数: 1