Observation of Two-Level Critical State in the Superconducting FeTe Thin Films
|
摘要
FeTe, a non-superconducting parent compound in the iron-chalcogenide family, becomes superconducting after annealing in oxygen. Under the presence of magnetism, spin-orbit coupling, inhomogeneity and lattice distortion,the nature of its superconductivity is not well understood. Here we combine the mutual inductance technique with magneto transport to study the magnetization and superconductivity of FeTe thin films. It is found that the films with the highest T_C show non-saturating superfluid density and a strong magnetic hysteresis distinct from that in a homogeneous superconductor. Such a hysteresis can be well explained by a two-level critical state model and suggests the importance of granularity to superconductivity in this compound.
FeTe, a non-superconducting parent compound in the iron-chalcogenide family, becomes superconducting after annealing in oxygen. Under the presence of magnetism, spin-orbit coupling, inhomogeneity and lattice distortion,the nature of its superconductivity is not well understood. Here we combine the mutual inductance technique with magneto transport to study the magnetization and superconductivity of FeTe thin films. It is found that the films with the highest T_C show non-saturating superfluid density and a strong magnetic hysteresis distinct from that in a homogeneous superconductor. Such a hysteresis can be well explained by a two-level critical state model and suggests the importance of granularity to superconductivity in this compound.
FeTe, a non-superconducting parent compound in the iron-chalcogenide family, becomes superconducting after annealing in oxygen. Under the presence of magnetism, spin-orbit coupling, inhomogeneity and lattice distortion,the nature of its superconductivity is not well understood. Here we combine the mutual inductance technique with magneto transport to study the magnetization and superconductivity of FeTe thin films. It is found that the films with the highest T_C show non-saturating superfluid density and a strong magnetic hysteresis distinct from that in a homogeneous superconductor. Such a hysteresis can be well explained by a two-level critical state model and suggests the importance of granularity to superconductivity in this compound.
引文
[1] Wang Q Y, Li Z, Zhang W H, Zhang Z C, Zhang J S, Li W, Ding H, Ou Y B, Deng P, Chang K, Wen J, Song C L,He K, Jia J F, Ji S H, Wang Y Y, Wang L L, Chen X, Ma X C and Xue Q K 2012 Chin. Phys. Lett. 29 037402
[2] Carlson E W, Kivelson S A, Orgad D and Emery V J 2004Concepts in High Temperature Superconductivity(Berlin:Springer)p 275
[3] Dai P 2015 Rev. Mod. Phys. 87 855
[4] Davis J C S and Lee D H 2013 Proc. Natl. Acad. Sci. USA110 17623
[5] Zhang P, Yaji K, Hashimoto T, Ota Y, Kondo T, Okazaki K, Wang Z, Wen J, Gu G D, Ding H and Shin S 2018 Science 360 182
[6] Yin J X, Wu Z, Wang J H, Ye Z Y, Gong J, Hou X Y, Shan L, Li A, Liang X J, Wu X X, Li J, Ting C S, Wang Z Q,Hu J P, Hor P H, Ding H and Pan S H 2015 Nat. Phys. 11543
[7] Nie Y, Telesca D, Budnick J I, Sinkovic B and Wells B O2010 Phys. Rev. B 82 020508(R)
[8] Si W, Jie Q, Wu L, Zhou J, Gu G, Johnson P D and Li Q2010 Phys. Rev. B 81 092506
[9] Hu H, Kwon J H, Zheng M, Zhang C, Greene L H, Eckstein J N and Zuo J M 2014 Phys. Rev. B 90 180504(R)
[10] Han Y, Li W Y, Cao L X, Wang X Y, Xu B, Zhao B R,Guo Y Q and Yang J L 2010 Phys. Rev. Lett. 104 017003
[11] Liu T J, Hu J, Qian B, Fobes D, Mao Z Q, Bao W, Reehuis M, Kimber S A J, ProkesK, Matas S, Argyriou D N, Hiess A, Rotaru A, Pham H, Spinu L, Qiu Y, Thampy V, Savici A T, Rodriguez J A and Broholm C 2010 Nat. Mater. 9718
[12] Logvenov G, Gozar A and Bozovic I 2009 Science 326 699
[13] Zhang Z, Wang Y H, Song Q, Liu C, Peng R, Moler K A,Feng D L and Wang Y Y 2015 Sci. Bull. 60 1301
[14] Bozovic I, He X, Wu J and Bollinger A T 2016 Nature 536309
[15] Fiory A T, Hebard A F, Eick R H, Mankiewich P M,Howard R E and O’Malley M L 1990 Phys. Rev. Lett. 653441
[16] Clem J R and Coffey M W 1992 Phys. Rev. B 46 14662
[17] Fiory A T, Hebard A F, Mankiewich P M and Howard R E 1988 Appl. Phys. Lett. 52 2165
[18] Deepwell D, Peets D C, Truncik C J S, Murphy N C, Kennett M P, Huttema W A, Liang R, Bonn D A, Hardy W N and Broun D M 2013 Phys. Rev. B 88 214509
[19] Ji L, Rzchowski M S, An, N and Tinkham M 1993 Phys.Rev. B 47 470
[20] Clem J R and Hao Z 1993 Phys. Rev. B 48 13774
[21] Nguyen P P, Oates D E, Dresselhaus G and Dresselhaus M S 1993 Phys. Rev. B 48 6400
[22] Kang M, Blumberg G, Klein M V and Kolesnikov N N 1996Phys. Rev. Lett. 77 4434
[23] Cohen R W and Abeles B 1968 Phys. Rev. 168 444
[24] Shalnikov A 1938 Nature 142 74
[2] Carlson E W, Kivelson S A, Orgad D and Emery V J 2004Concepts in High Temperature Superconductivity(Berlin:Springer)p 275
[3] Dai P 2015 Rev. Mod. Phys. 87 855
[4] Davis J C S and Lee D H 2013 Proc. Natl. Acad. Sci. USA110 17623
[5] Zhang P, Yaji K, Hashimoto T, Ota Y, Kondo T, Okazaki K, Wang Z, Wen J, Gu G D, Ding H and Shin S 2018 Science 360 182
[6] Yin J X, Wu Z, Wang J H, Ye Z Y, Gong J, Hou X Y, Shan L, Li A, Liang X J, Wu X X, Li J, Ting C S, Wang Z Q,Hu J P, Hor P H, Ding H and Pan S H 2015 Nat. Phys. 11543
[7] Nie Y, Telesca D, Budnick J I, Sinkovic B and Wells B O2010 Phys. Rev. B 82 020508(R)
[8] Si W, Jie Q, Wu L, Zhou J, Gu G, Johnson P D and Li Q2010 Phys. Rev. B 81 092506
[9] Hu H, Kwon J H, Zheng M, Zhang C, Greene L H, Eckstein J N and Zuo J M 2014 Phys. Rev. B 90 180504(R)
[10] Han Y, Li W Y, Cao L X, Wang X Y, Xu B, Zhao B R,Guo Y Q and Yang J L 2010 Phys. Rev. Lett. 104 017003
[11] Liu T J, Hu J, Qian B, Fobes D, Mao Z Q, Bao W, Reehuis M, Kimber S A J, ProkesK, Matas S, Argyriou D N, Hiess A, Rotaru A, Pham H, Spinu L, Qiu Y, Thampy V, Savici A T, Rodriguez J A and Broholm C 2010 Nat. Mater. 9718
[12] Logvenov G, Gozar A and Bozovic I 2009 Science 326 699
[13] Zhang Z, Wang Y H, Song Q, Liu C, Peng R, Moler K A,Feng D L and Wang Y Y 2015 Sci. Bull. 60 1301
[14] Bozovic I, He X, Wu J and Bollinger A T 2016 Nature 536309
[15] Fiory A T, Hebard A F, Eick R H, Mankiewich P M,Howard R E and O’Malley M L 1990 Phys. Rev. Lett. 653441
[16] Clem J R and Coffey M W 1992 Phys. Rev. B 46 14662
[17] Fiory A T, Hebard A F, Mankiewich P M and Howard R E 1988 Appl. Phys. Lett. 52 2165
[18] Deepwell D, Peets D C, Truncik C J S, Murphy N C, Kennett M P, Huttema W A, Liang R, Bonn D A, Hardy W N and Broun D M 2013 Phys. Rev. B 88 214509
[19] Ji L, Rzchowski M S, An, N and Tinkham M 1993 Phys.Rev. B 47 470
[20] Clem J R and Hao Z 1993 Phys. Rev. B 48 13774
[21] Nguyen P P, Oates D E, Dresselhaus G and Dresselhaus M S 1993 Phys. Rev. B 48 6400
[22] Kang M, Blumberg G, Klein M V and Kolesnikov N N 1996Phys. Rev. Lett. 77 4434
[23] Cohen R W and Abeles B 1968 Phys. Rev. 168 444
[24] Shalnikov A 1938 Nature 142 74