Condensed Matter最新文献_第10页

Optimization of La2−xSrxCuO4 Single Crystal Film Growth via Molecular Beam Epitaxy 分子束外延法优化La2−xSrxCuO4单晶薄膜生长

IF 1.7

Condensed Matter Pub Date : 2023-01-20 DOI: 10.3390/condmat8010013

Xi He, Xiaotao Xu, Xiaoyan Shi, I. Božović

{"title":"Optimization of La2−xSrxCuO4 Single Crystal Film Growth via Molecular Beam Epitaxy","authors":"Xi He, Xiaotao Xu, Xiaoyan Shi, I. Božović","doi":"10.3390/condmat8010013","DOIUrl":"https://doi.org/10.3390/condmat8010013","url":null,"abstract":"Atomic layer-by-layer molecular beam epitaxy (ALL-MBE) combined with ozone is one of the best methods to fabricate single-crystal thin films of complex oxides. Cuprate such as La2−xSrxCuO4 (LSCO) is a representative complex-oxide high-temperature superconductor (HTS) material. Our group utilizes this method to produce high-quality single-crystal HTS films with atomically smooth surfaces and interfaces. In addition, ALL-MBE enables us to engineer multilayer heterostructures with atomic precision. This allows the fabrication of tunnel junctions, various nanostructures, and other HTS devices of interest for superconducting electronics. We have synthesized over three thousand LSCO thin films in the past two decades. These films’ structural and electronic properties have been studied and characterized by various methods. Here, we distill the extensive experience we accumulated into a step-by-step protocol to fabricate atomically perfect LSCO films. The recipe includes substrate preparation, ozone generation and distillation, source calibration, the in situ monitoring of the film synthesis, post-growth annealing, and ex situ characterization. It discloses a reproducible way to fabricate single-crystal LSCO films for basic research and HTS electronic applications.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43381004","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

Acknowledgment to the Reviewers of Condensed Matter in 2022 对2022年凝聚态物质评审员的致谢

IF 1.7

Condensed Matter Pub Date : 2023-01-17 DOI: 10.3390/condmat8010010

引用次数: 0

Second-Neighbor Hopping Effects in the Two-Dimensional Attractive Hubbard Model 二维吸引Hubbard模型中的第二邻居跳跃效应

IF 1.7

Condensed Matter Pub Date : 2023-01-17 DOI: 10.3390/condmat8010011

Rodrigo A. Fontenele, Nathan Vasconcelos, N. Costa, T. Paiva, R. R. dos Santos

{"title":"Second-Neighbor Hopping Effects in the Two-Dimensional Attractive Hubbard Model","authors":"Rodrigo A. Fontenele, Nathan Vasconcelos, N. Costa, T. Paiva, R. R. dos Santos","doi":"10.3390/condmat8010011","DOIUrl":"https://doi.org/10.3390/condmat8010011","url":null,"abstract":"The emergence of superconductivity (SC) in lattice models, such as the attractive Hubbard one, has renewed interest since the realization of cold-atom experiments. However, reducing the temperature in these experiments is a bottleneck; therefore, investigating how to increase the energy scale for SC is crucial to cold atoms. In view of this, we examine the effects of next-nearest-neighbor hoppings (t′) on the pairing properties of the attractive Hubbard model in a square lattice. To this end, we analyze the model through unbiased Quantum Monte Carlo simulations for fixed density n=0.87, and perform finite-size scaling analysis to the thermodynamic limit. As our main result, we notice that the existence of further hopping channels leads to an enhancement of the pairing correlations, which, in turn, increases the ground-state order parameter Δ. Finally, at finite temperatures, for t′/t≠0, this enhancement of pairing correlations leads to an increase in the critical temperature Tc. That is, the fine-tuning of second-neighbor hoppings increases the energy scales for SC, and may be a route by which cold-atom experiments can achieve such a phase and to help us further understand the nature of this phenomenon.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44978504","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

Detection of Surface States in Quantum Materials ZrTe2 and TmB4 by Scanning Tunneling Microscopy 扫描隧道显微镜检测量子材料ZrTe2和TmB4的表面态

IF 1.7

Condensed Matter Pub Date : 2023-01-16 DOI: 10.3390/condmat8010009

M. V. Ale Crivillero, J. Souza, Vicky Hasse, M. Schmidt, N. Shitsevalova, S. Gabáni, K. Siemensmeyer, K. Flachbart, S. Wirth

{"title":"Detection of Surface States in Quantum Materials ZrTe2 and TmB4 by Scanning Tunneling Microscopy","authors":"M. V. Ale Crivillero, J. Souza, Vicky Hasse, M. Schmidt, N. Shitsevalova, S. Gabáni, K. Siemensmeyer, K. Flachbart, S. Wirth","doi":"10.3390/condmat8010009","DOIUrl":"https://doi.org/10.3390/condmat8010009","url":null,"abstract":"Scanning Tunneling Microscopy and Spectroscopy (STM/S), with its exceptional surface sensitivity and exquisite energy resolution, is well suited for the investigation of surface states down to atomic length scales. As such, it became an essential tool to probe the surface states of materials, including those with non-trivial topology. One challenge, however, can be the preparation of clean surfaces which allow the study of preferably unchanged surface properties with respect to the bulk amount. Here, we report on the STM/S of two materials, ZrTe2 and TmB4. The former cleaves easily and defects can be examined in detail. However, our STS data can only qualitatively be compared to the results of band structure calculations. In the case of TmB4, the preparation of suitable surfaces is highly challenging, and atomically flat surfaces (likely of B-termination) were only encountered rarely. We found a large density of states (DOS) at the Fermi level EF and a mostly featureless differential conductance near EF. Further efforts are required to relate our results to the electronic structure predicted by ab initio calculations.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45694293","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

Experimental and Theoretical Investigation of High-Resolution X-ray Absorption Spectroscopy (HR-XAS) at the Cu K-Edge for Cu2ZnSnSe4 Cu2ZnSnSe4在Cu K边缘的高分辨X射线吸收光谱的实验与理论研究

IF 1.7

Condensed Matter Pub Date : 2023-01-13 DOI: 10.3390/condmat8010008

Wei Xu, Yujun Zhang, K. Ishii, H. Wadati, Yingcai Zhu, Z.H. Guo, Qianshun Diao, Zhen Hong, Haijiao Han, Lidong Zhao

引用次数: 0

Is Nematicity in Cuprates Real? Cuprates中的Nematicity是真的吗？

IF 1.7

Condensed Matter Pub Date : 2023-01-10 DOI: 10.3390/condmat8010007

I. Božović, Xi He, A. Bollinger, R. Caruso

引用次数: 1

Thermodynamics in Stochastic Conway’s Game of Life 随机Conway生命游戏中的热力学

IF 1.7

Condensed Matter Pub Date : 2023-01-09 DOI: 10.3390/condmat8020047

K. Pomorski, Dariusz Kotula

引用次数: 2

Magnetic Studies of Iron-Doped Probable Weyl Semimetal WTe2 铁掺杂可能的Weyl半金属WTe2的磁性研究

IF 1.7

Condensed Matter Pub Date : 2023-01-06 DOI: 10.3390/condmat8010006

Andranik Khachatryan, E. Charnaya, M. Likholetova, E. Shevchenko, M. Lee, L. Chang, S. Naumov, A. Perevalova, E. Marchenkova, V. Marchenkov

{"title":"Magnetic Studies of Iron-Doped Probable Weyl Semimetal WTe2","authors":"Andranik Khachatryan, E. Charnaya, M. Likholetova, E. Shevchenko, M. Lee, L. Chang, S. Naumov, A. Perevalova, E. Marchenkova, V. Marchenkov","doi":"10.3390/condmat8010006","DOIUrl":"https://doi.org/10.3390/condmat8010006","url":null,"abstract":"The non-trivial topology of electronic bands in Weyl semimetals originates from band inversion due to strong spin–orbit coupling. The Weyl semimetals have pairs of Weyl gap-less nodes in the bulk Brillouin zone. The tungsten ditelluride WTe2 likely belongs to type II Weyl semimetals. Doping WTe2 with magnetic ions could induce magnetic ordering in this crystal, which provides prospects for practical applications. We studied the magnetic properties of the iron-doped single crystals Fe0.03W0.97Te2, annealed and unannealed, in comparison with the undoped WTe2. Measurements of the dc magnetization were carried out from 1.8 to 400 K. We revealed pronounced ferromagnetic ordering that was affected by annealing. Anomalies associated with antiferromagnetism and paramagnetism were also found. The magnetic order was suppressed by a field of 60 kOe. The rise in susceptibility with increasing temperature was observed at high temperatures in all samples and was treated using a model developed for Weyl semimetals. The Curie–Weiss law fit at 60 kOe showed that the effective magnetic moment was close to that of Fe2+. Metamagnetism was demonstrated for the unannealed doped WTe2 crystal. The data for the heat capacity of the iron-doped sample agreed with results for the undoped WTe2.","PeriodicalId":10665,"journal":{"name":"Condensed Matter","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48805129","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

Charge–Phase Duality and Cotunneling of Fluxons in SQUID-like Nanorings 鱿鱼状纳米结构中通量子的电荷-相对偶性和共隧穿

IF 1.7

Condensed Matter Pub Date : 2022-12-31 DOI: 10.3390/condmat8010005

A. Latyshev, A. G. Semenov, A. Zaikin

引用次数: 0

Destructive Interference of the Superconducting Subband Condensates in the Quasi-1D Multigap Material Nanostructures 准一维多间隙材料纳米结构中超导子带凝聚的破坏性干涉

IF 1.7

Condensed Matter Pub Date : 2022-12-28 DOI: 10.3390/condmat8010004

W. Pasek, M. H. Degani, M. Z. Maialle

引用次数: 0