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SCIENCE CHINA Physics, Mechanics & Astronomy
2016, Vol. 59, No. 5
Online Publication Date: 01 April 2016

The picture on the cover shows the schematic structure and some photos taken by the scanning electron microscope (SEM) of the newly discovered superconductor (Li1-xFex)OHFeSe with a superconducting transition temperature of about 39 K. The main skeleton here gives the structure, the background photos are the SEM images after cleaving the sample. Sometimes, the sample is composed by many random grown tiny plates like crystals with the lateral surface of about 5-10 μm (left bottom part of the background). Sometimes, the sample can have a larger flat surface constructed by many plates like crystals which grow in a textured way (r ...                  Show All


Hot Paper More»   
Effect of impurity scattering on superconductivity in K2Cr3As3
Yi Liu, Jin-Ke Bao, Hao-Kun Zuo, Abduweli Ablimit, Zhang-Tu Tang, Chun-Mu Feng, Zeng-Wei Zhu, Guang-Han Cao
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): (5): 657402
31P NMR study of magnetic phase transitions of MnP single crystal under 2 GPa pressure
GuoZhi Fan, Bo Zhao, Wei Wu, Ping Zheng, JianLin Luo
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): (5): 657403
Robust superconductivity and transport properties in (Li1-xFex)OHFeSe single crystals
Hai Lin, Jie Xing, XiYu Zhu, Huan Yang, Hai-Hu Wen
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657404
Nodeless superconducting gaps in Ca10(Pt4-δAs8)((Fe1-xPtx)2As2)5probed by quasiparticle heat transport
Xun Qiu, LanPo He, XiaoChen Hong, Zhen Zhang, Jian Pan, XiaoPing Shen, DongLai Feng, ShiYan Li
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657405
Current Issue Archive Accepted Online First Special Topic View by Fields
  SCIENCE CHINA Physics, Mechanics & Astronomy--2016, 59(5)   Published: 01 April 2016
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Invited Review | Theoretical physics

Complex fields in heterogeneous materials under shock: modeling, simulation and analysis

AiGuo Xu, GuangCai Zhang, YangJun Ying, Cheng Wang
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 650501 | doi:10.1007/s11433-016-5801-0
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In this mini-review we summarize the progress of modeling, simulation and analysis of shock responses of heterogeneous materials in our group in recent years. The basic methodology is as below. We first decompose the problem into different scales. Construct/Choose a model according to the scale and main mechanisms working at that scale. Perform numerical simulations using the relatively mature schemes. The physical information is transferred between neighboring scales in such a way: The statistical information of results in smaller scale contributes to establishing the constitutive equation in larger one. Except for the microscopic Molecular Dynamics (MD) model, both the mesoscopic and macroscopic models can be further classified into two categories, solidic and fluidic models, respectively. The basic ideas and key techniques of the MD, material point method and discrete Boltzmann method are briefly reviewed. Among various schemes used in analyzing the complex fields and structures, the morphological analysis and the home-built software, GISO, are briefly introduced. New observations are summarized for scales from the larger to the smaller.

Show PACS: 05.40.-a;62.50.Ef;81.05.Rm;81.05.Zx;62.20.mm
Invited Review | Nuclear Physics

A proposed direct measurement of cross section at Gamow window for key reaction 19F(p,α)16O in Asymptotic Giant Branch stars with a planned accelerator in CJPL

JianJun He, ShiWei Xu, ShaoBo Ma, Jun Hu, LiYong Zhang, ChangBo Fu, NingTao Zhang, Gang Lian, Jun Su, YunJu Li, ShengQuan Yan, YangPing Shen, SuQing Hou, BaoLu Jia, Tao Zhang, XiaoPeng Zhang, Bing Guo, Shigeru Kubono, WeiPing Liu
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 652001 | doi:10.1007/s11433-016-5797-5
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In 2014, the National Natural Science Foundation of China (NSFC) approved the Jinping Underground Nuclear Astrophysics laboratory (JUNA) project, which aims at direct cross-section measurements of four key stellar nuclear reactions right down to the Gamow windows. In order to solve the observed fluorine overabundances in Asymptotic Giant Branch (AGB) stars, measuring the key19F(p,α)16O reaction at effective burning energies (i.e., at Gamow window) is established as one of the scientific research sub-projects. The present paper describes this sub-project in details, including motivation, status, experimental setup, yield and background estimation, aboveground test, as well as other relevant reactions.

Show PACS: 26.20.+f;26.30.+k;25.40.Ny;27.20.+n
Invited Review | Nuclear Physics

A proposed direct measurement of cross section at Gamow window for key reaction 19F(p,α)16O in Asymptotic Giant Branch stars with a planned accelerator in CJPL

JianJun He, ShiWei Xu, ShaoBo Ma, Jun Hu, LiYong Zhang, ChangBo Fu, NingTao Zhang, Gang Lian, Jun Su, YunJu Li, ShengQuan Yan, YangPing Shen, SuQing Hou, BaoLu Jia, Tao Zhang, XiaoPeng Zhang, Bing Guo, Shigeru Kubono, WeiPing Liu
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 652001 | doi:10.1007/s11433-016-5797-5
Full Text: PDF (0KB)
Show Abstract

In 2014, the National Natural Science Foundation of China (NSFC) approved the Jinping Underground Nuclear Astrophysics laboratory (JUNA) project, which aims at direct cross-section measurements of four key stellar nuclear reactions right down to the Gamow windows. In order to solve the observed fluorine overabundances in Asymptotic Giant Branch (AGB) stars, measuring the key19F(p,α)16O reaction at effective burning energies (i.e., at Gamow window) is established as one of the scientific research sub-projects. The present paper describes this sub-project in details, including motivation, status, experimental setup, yield and background estimation, aboveground test, as well as other relevant reactions.

Show PACS: 26.20.+f;26.30.+k;25.40.Ny;27.20.+n
Articles | Nuclear Physics

Effect of time-odd fields on odd-even mass differences of semi-magic nuclei

Kun Yu, XianRong Zhou, JiWei Cui, H. Sagawa
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 652002 | doi:10.1007/s11433-016-5796-6
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The effect of time-odd fields of Skyrme interaction on neutron odd-even mass differences is studied in the framework of axially deformed Skyrme Hartree-Fock (DSHF)+BCS model. To this end, we take into account both the time-even and time-odd fields to calculate the one-neutron and two-neutron separation energies and pairing gaps of semi-magic Ca, Ni, and Sn isotopic chains. In the calculations, a surface-type pairing interaction (IS pairing) and an isospin dependent contact pairing interaction (IS+IV pairing) are adopted on top of Skyrme interactions SLy4, SLy6 and SkM*, respectively. We find that the time-odd fields have in general small effects on pairing gaps, but achieve better agreement with experimental data using SLy4 and Sly6 interactions, respectively. It is also shown that the calculations with IS+IV pairing reproduce the one-neutron separation energies of Sn isotopes better than those with the IS pairing interaction when the contributions of the time-odd fields are included.

Show PACS: 21.10.Dr;21.30.Fe;27.30.+t;27.50.+e
Special Topic: New Unconventional Superconductors and Weyl Semimetal

Editorial

Hai-Hu Wen
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657401 | doi:10.1007/s11433-016-0096-8
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Special Topic: New Unconventional Superconductors and Weyl Semimetal

Effect of impurity scattering on superconductivity in K2Cr3As3 Hot!

Yi Liu, Jin-Ke Bao, Hao-Kun Zuo, Abduweli Ablimit, Zhang-Tu Tang, Chun-Mu Feng, Zeng-Wei Zhu, Guang-Han Cao
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657402 | doi:10.1007/s11433-016-5788-6
Full Text: PDF (1457KB)
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Impurity scattering in a superconductor may serve as an important probe for the nature of superconducting pairing state. Here we report the impurity effect on superconducting transition temperature Tc in the newly discovered Cr-based superconductor K2Cr3As3. The resistivity measurements show that the crystals prepared using high-purity Cr metal (>=99.99%) have an electron mean free path much larger than the superconducting coherence length. For the crystals prepared using impure Cr that contains various nonmagnetic impurities, however, the Tc decreases significantly, in accordance with the generalized Abrikosov-Gor'kov pair-breaking theory. This finding supports a non-s-wave superconductivity in K2Cr3As3.

Show PACS: 74.62.En;74.25.F-;74.70.Dd
Special Topic: New Unconventional Superconductors and Weyl Semimetal

31P NMR study of magnetic phase transitions of MnP single crystal under 2 GPa pressure Hot!

GuoZhi Fan, Bo Zhao, Wei Wu, Ping Zheng, JianLin Luo
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657403 | doi:10.1007/s11433-016-5783-y
Full Text: PDF (557KB)
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Superconductivity on the border of the long-range magnetic order has been discovered in MnP under high pressures. In order to investigate the nature of the magnetic properties adjacent to the superconducting state, we performed zero-field 31P NMR for MnP single crystal under ambient and hydrostatic pressure of 2 GPa, respectively. Radio frequency power level was used to determine whether NMR signal originates from a helical state or not. When 2 GPa pressure was applied, the signal from helical state exists even above 160 K, while that from the ferromagnetic phase was not observed. Our NMR results indicate that the magnetic phase which is adjacent to the superconducting state is in a helical magnetic structure.

Show PACS: 74.70.-b;75.30.Kz;76.60.-k
Special Topic: New Unconventional Superconductors and Weyl Semimetal

Robust superconductivity and transport properties in (Li1-xFex)OHFeSe single crystals Hot!

Hai Lin, Jie Xing, XiYu Zhu, Huan Yang, Hai-Hu Wen
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657404 | doi:10.1007/s11433-016-5782-z
Full Text: PDF (1597KB)
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The recently discovered (Li1-xFex)OHFeSe superconductor with Tc about 40 K provides a good platform for investigating the magnetization and electrical transport properties of FeSe-based superconductors. By using a hydrothermal ion-exchange method, we have successfully grown crystals of (Li1-xFex)OHFeSe. X-ray diffraction on the sample shows the single crystalline PbO-type structure with the c-axis preferential orientation. Magnetic susceptibility and resistivemeasurements show an onset superconducting transition at around Tc=38.3 K. Using the magnetization hysteresis loops and Bean critical state model, a large critical current Js is observed in low temperature region. The critical current density is suppressed exponentially with increasing magnetic field. Temperature dependencies of resistivity under various currents and fields are measured, revealing a robust superconducting current density and bulk superconductivity.

Show PACS: 74.25.F-;74.25.Sv;74.25.Ha;74.25.Fy
Special Topic: New Unconventional Superconductors and Weyl Semimetal

Nodeless superconducting gaps in Ca10(Pt4-δAs8)((Fe1-xPtx)2As2)5probed by quasiparticle heat transport Hot!

Xun Qiu, LanPo He, XiaoChen Hong, Zhen Zhang, Jian Pan, XiaoPing Shen, DongLai Feng, ShiYan Li
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657405 | doi:10.1007/s11433-016-5780-1
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The in-plane thermal conductivity of the iron-based superconductor Ca10(Pt4-δAs8)((Fe1-xPtx)2As2)5 single crystal ("10-4-8", Tc= 22 K) was measured down to 80 mK. In a zero field, the residual linear term κ0/T is negligible, suggesting the nodeless superconducting gaps in this multiband compound. In the magnetic fields, κ0/T increases rapidly, which mimics the multiband superconductor NbSe2 and LuNi2B2C with highly anisotropic gap. Such a field dependence of κ0/T is an evidence for the multiple superconducting gaps with quite different magnitudes or highly anisotropic gap. Compared with the London penetration depth results of the Ca10(Pt3As8)((Fe1-xPtx)2As2)5 ("10-3-8") compound, the 10-4-8 and 10-3-8 compounds may have a similar superconducting gap structure.

Show PACS: 74.70.Dd;74.25.Fy;74.25.Op
Special Topic: New Unconventional Superconductors and Weyl Semimetal

Large unsaturated positive and negative magnetoresistance in Weyl semimetal TaP Hot!

JianHua Du, HangDong Wang, Qin Chen, QianHui Mao, Rajwali Khan, BinJie Xu, YuXing Zhou, YanNan Zhang, JinHu Yang, Bin Chen, ChunMu Feng, and MingHu Fang
SCIENCE CHINA Physics, Mechanics & Astronomy, 2016, 59(5): 657406 | doi:10.1007/s11433-016-5798-4
Full Text: PDF (2080KB)
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After successfully growing single-crystal TaP, we measured its longitudinal resistivity (ρxx) and Hall resistivity (ρyx) at magnetic fields up to 9 T in the temperature range of 2-300 K. At 8 T, the magnetoresistance (MR) reached 3.28 × 105% at 2 K, 176% at 300 K. Neither value appeared saturated. We confirmed that TaP is a hole-electron compensated semimetal with a low carrier concentration and high hole mobility of μh=3.71 × 105 cm2/V s, and found that a magnetic-field-induced metal-insulator transition occurs at room temperature. Remarkably, because a magnetic field (H) was applied in parallel to the electric field (E), a negative MR due to a chiral anomaly was observed and reached -3000% at 9 T without any sign of saturation, either, which is in contrast to other Weyl semimetals (WSMs). The analysis of the Shubnikov-de Haas (SdH) oscillations superimposed on the MR revealed that a nontrivial Berry's phase with a strong offset of 0.3958, which is the characteristic feature of charge carriers enclosing a Weyl node. These results indicate that TaP is a promising candidate not only for revealing fundamental physics of the WSM state but also for some novel applications.

Show PACS: 71.30.+h;73.43.Qt;72.20.Jv
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