Point-contact Andreev reflection spectroscopy on Re<sub>3</sub>W superconductor

Wang Zong; Hou Xing-Yuan; Pan Bo-Jin; Gu Ya-Dong; Zhang Meng-Di; Zhang Fan; Chen Gen-Fu; Ren Zhi-An; Shan Lei

doi:10.7498/aps.68.20181996

Abstract

Non-centrosymmetric superconductors have received considerable attention because of their possible possession of unconventional spin-triplet pairing.For this reason,the non-centrosymmetric Re₃W with α -Mn structure has been widely concerned.However,almost all the previous studies support that the non-centrosymmetric phase of Re₃W is a conventional weak-coupling s-wave superconductor.Later on,it is proved that Re₃W has two different superconducting phases,one is the non-centrosymmetric phase and the other has a centrosymmetric hexagonal structure.Thus,a comparative study of these two superconducting phases could provide more information about the effect of non-centrosymmetric structure on the pairing symmetry of Re₃W.
In this paper,point-contact Andreev reflection experiments are carried out on Re₃W/Au and the data can be well fitted by isotropic s-wave Blonder-Tinkham-Klapwijk (BTK) theory.In combination with our previous researches,we find that both centrosymmetric and non-centrosymmetric phases have similar temperature dependence of superconducting gap (△) with almost the same gap ratio of △/T_c.These results present strong evidence that both phases of Re₃W are weak coupling Bardeen-Cooper-Schrieffer superconductors.
Another interesting finding is that both phases of Re₃W could easily form an ideal point-contact junction (i.e.,inelastic scatterings at the interface can be ignored) with a normal metal tip.This is manifested as an extremely small broadening factor (Γ) used in the fitting process,and indicates a clean (and possibly transparent) interface.Keeping this in mind,we can assume that the effective barrier (Z) at the interface mainly comes from the mismatch between the Fermi velocity of the superconductor and that of the normal metal,which can be estimated from the formula Z²=(1-r)²/4r,where r is the ratio between those two Fermi velocities.From this formula,we can obtain the Fermi velocity of Re₃W by using the known value of Au's Fermi velocity and the fitting parameter Z for the Re₃W/Au point contacts.It is interesting to find that the chemical property of Re₃W is stable in the atmospheric environment.Even if the samples are exposed to the atmospheric environment for nearly six months,the inelastic scatterings are still very weak,and the superconducting properties are unchanged.
Such an exceptional performance of Re₃W can be utilized to study the physical properties of its counter electrode in a point contact.As an attempt,we build a point contact between Re₃W and a ferromagnetic Ni tip,and measure its Andreev reflection spectra which are then fitted with a modified BTK model by considering spin polarization.The determined spin polarization of Ni is in good agreement with previously reported result. Moreover,using the Fermi velocities of Re₃W and Ni,we can calculate the effective barrier to be around 0.3 in the Re₃W/Ni interface,which coincides with the fitting parameter Z.These results self-consistently demonstrate the validity of the determination of Re₃W's Fermi velocity and the cleanness/transparency of the studied point-contact interface.

Keywords:

PACS:

07.05.Tp	(Computer modeling and simulation)
41.20.Gz	(Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems)
41.90.+e	(Other topics in electromagnetism; electron and ion optics)

Authors and contacts

1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Collaborative Innovation Center of Quantum Matter, Beijing 100190, China;
4. Institute of Physical Science and Information Technology, Anhui University, Hefei 230601, China

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其他类型引用(16)

[1]	Bauer E, Hilscher G, Michor H, Paul C, Scheidt E W, Gribanov A, Seropegin Y, Noël H, Sigrist M, Rogl P 2004 Phys. Rev. Lett. 92 027003
[2]	Gor'kov L P, Rashba E I 2001 Phys. Rev. Lett. 87 037004
[3]	Frigeri P A, Agterberg D F, Koga A, Sigrist M 2004 Phys. Rev. Lett. 92 097001
[4]	Bauer E, Sigrist M 2012 Non-Centrosymmetric Superconductors: Introduction and Overview (Berlin Heidelberg: Springer Verlag) pp4-5
[5]	Izawa K, Kasahara Y, Matsuda Y, Behnia K, Yasuda T, Settai R, Onuki Y 2005 Phys. Rev. Lett. 94 197002
[6]	Bonalde I, Brämer-Escamilla W, Bauer E 2005 Phys. Rev. Lett. 94 207002
[7]	Yuan H Q, Agterberg D F, Hayashi N, Badica P, Vandervelde D, Togano K, Sigrist M, Salamon M B 2006 Phys. Rev. Lett. 97 017006
[8]	Sato M, Fujimoto S 2009 Phys. Rev. B 79 094504
[9]	Chadov S, Qi X L, Kübler J, Fecher G H, Felser C, Zhang S C 2010 Nat. Mater. 9 541
[10]	Blaugher R D, Hulm J K 1961 J. Phys. Chem. Solids 19 134
[11]	Blaugher R D, Taylor A, Hulm J K 1962 IBM J. Res. Dev. 6 116
[12]	Zuev Y L, Kuznetsova V A, Prozorov R, Vannette M D, Lobanov M V, Christen D K, Thompson J R 2007 Phys. Rev. B 76 132508
[13]	Huang Y, Yan J, Wang Y L, Shan L, Luo Q, Wang W H, Wen H H 2008 Supercond. Sci. Technol. 21 075011
[14]	Blonder G E, Tinkham M, Klapwijk T M 1982 Phys. Rev. B 25 4515
[15]	Biswas P K, Lees M R, Hillier A D, Smith R I, Marshall W G, Paul D M 2011 Phys. Rev. B 84 184529
[16]	Chu C W, McMillan W L, Luo H L 1971 Phys. Rev. B 3 3757
[17]	Dynes R C, Narayanamurti V, Garno J P 1978 Phys. Rev. Lett. 41 1509
[18]	Dynes R C, Garno J P, Hertel G B, Orlando T P 1984 Phys. Rev. Lett. 53 2437
[19]	Plecenik A, Grajcar M, Beňačka Š, Seidel P, Pfuch A 1994 Phys. Rev. B 49 10016
[20]	Soulen R J, Byers J M, Osofsky M S, Nadgorny B, Ambrose T, Cheng S F, Broussard P R, Tanaka C T, Nowak J, Moodera J S, Barry A, Coey J M D 1998 Science 282 85
[21]	Nadgorny B, Soulen Jr R J, Osofsky M S, Mazin I I, Laprade G, van de Veerdonk R J M, Smits A A, Cheng S F, Skelton E F, Qadri S B 2000 Phys. Rev. B 61 3788
[22]	Ji Y, Strijkers G J, Yang F Y, Chien C L, Byers J M, Anguelouch A, Xiao G, Gupta A 2001 Phys. Rev. Lett. 86 5585
[23]	Panguluri R P, Tsoi G, Nadgorny B, Chun S H, Samarth N, Mazin I I 2003 Phys. Rev. B 68 201307
[24]	Clowes S K, Miyoshi Y, Bugoslavsky Y, Branford W R, Grigorescu C, Manea S A, Monnereau O, Cohen L F 2004 Phys. Rev. B 69 214425
[25]	Biswas P K, Hillier A D, Lees M R, Paul D M 2012 Phys. Rev. B 85 134505
[26]	Daghero D, Gonnelli R S 2010 Supercond. Sci. Technol. 23 043001
[27]	Gall D 2016 J. Appl. Phys. 119 85101
[28]	Mazin I I, Golubov A A, Nadgorny B 2001 J. Appl. Phys. 89 7576
[29]	Moodera J S, Mathon G 1999 J. Magn. Magn. Mater. 200 248
[30]	Strijkers G J, Ji Y, Yang F Y, Chien C L, Byers J M 2001 Phys. Rev. B 63 104510

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2.	孙会琴，王思飞，田铮. 孔阵腔体屏蔽效能BLT方程修正与拓展分析. 电光与控制. 2023(07): 100-105 . 百度学术
3.	张晗，李常贤. 高频有损斜开孔腔体屏蔽效能研究. 微波学报. 2023(06): 12-17+34 . 百度学术
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Point-contact Andreev reflection spectroscopy on Re₃W superconductor

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Point-contact Andreev reflection spectroscopy on Re3W superconductor

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Point-contact Andreev reflection spectroscopy on Re₃W superconductor