Chin. Phys. Lett.  2001, Vol. 18 Issue (6): 816-819    DOI:
Original Articles |
Strong Quantum Fluctuation of Vortices in Bulk Samples of the New Superconductor MgB2
WEN Hai-Hu;LI Shi-Liang;ZHAO Zhi-Wen;NI Yong-Ming;REN Zhi-An;CHE Guang-Can;YANG Hai-Peng;LIU Zhi-Yong;ZHAO Zhong-Xian
National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
Cite this article:   
WEN Hai-Hu, LI Shi-Liang, ZHAO Zhi-Wen et al  2001 Chin. Phys. Lett. 18 816-819
Download: PDF(501KB)  
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks
Abstract By using transport and magnetic measurement, the upper critical field Hc2(T) and the irreversibility line Hirr(T) has been determined. A big separation between Hc2(0) and Hirr(0) has been found showing the existence of a quantum vortex liquid state induced by quantum fluctuation of vortices in the new superconductor MgB2. Further investigation on the magnetic relaxation shows that both the quantum tunneling and the thermally activated flux creep depends weakly on temperature. However, when the melting field Hirr is approached, a drastic rise of the relaxation rate is observed. This may indicate that the melting of the vortex matter at a finite temperature is also induced by the quantum fluctuation of vortices.
Keywords: 74.25.Bt      74.20.Mn      74.40.+k      74.60.Ge     
Published: 01 June 2001
PACS:  74.25.Bt (Thermodynamic properties)  
  74.20.Mn (Nonconventional mechanisms)  
  74.40.+k  
  74.60.Ge  
TRENDMD:   
URL:  
https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2001/V18/I6/0816
Service
E-mail this article
E-mail Alert
RSS
Articles by authors
WEN Hai-Hu
LI Shi-Liang
ZHAO Zhi-Wen
NI Yong-Ming
REN Zhi-An
CHE Guang-Can
YANG Hai-Peng
LIU Zhi-Yong
ZHAO Zhong-Xian
Related articles from Frontiers Journals
[1] HUANG Bei-Bing, WAN Shao-Long. First and Second Sound Modes in a Uniform Fermi Gas[J]. Chin. Phys. Lett., 2009, 26(7): 816-819
[2] ZHU Wei-Ting, REN Qing-Bao, CHEN Qing-Hu,. Variational Study on a Dissipative Two-Level System[J]. Chin. Phys. Lett., 2008, 25(9): 816-819
[3] MU Gang, ZHU Xi-Yu, FANG Lei, SHAN Lei, REN Cong, WEN Hai-Hu. Nodal Gap in Fe-Based Layered Superconductor LaO0.9F0.1-δFeAs Probed by Specific Heat Measurements[J]. Chin. Phys. Lett., 2008, 25(6): 816-819
[4] LIU Guang-Tong, JIN Hao, LI Zheng, GENG Hong-Xia, CHE Guang-Can, JIN Duo, SUN Lian-Feng XIE Si-Shen, LUO Jian-Lin. Superconductivity in Mg-Doped Layered Intermetallic Compound NbB2[J]. Chin. Phys. Lett., 2008, 25(2): 816-819
[5] MA Lei. Kink Structures of Spin-Polarized Electrons due to Electron--Magnon Scattering in Ferromagnetic State[J]. Chin. Phys. Lett., 2007, 24(12): 816-819
[6] R. Afzali, A. T. Rezakhani,. Order Parameter of a Nanometre-Scale S-Wave Superconducting Grain in Quantum Tunnelling Process: Frequency Space Analysis[J]. Chin. Phys. Lett., 2006, 23(4): 816-819
[7] CHENG Kuan, LIU Yu-Liang. Numerical Study of Luttinger Liquid Regime of Two-Leg Hubbard Ladders[J]. Chin. Phys. Lett., 2005, 22(9): 816-819
[8] REN Qing-Bao, CHEN Qing-Hu. Two-Site Holstein Model: a Variational Wavefunction Analysis[J]. Chin. Phys. Lett., 2005, 22(11): 816-819
[9] WU Yan-Li, LIU Chuan, LUO Qiang,. Preliminary Monte Carlo Results for the Three-Dimensional Holstein Model[J]. Chin. Phys. Lett., 2003, 20(9): 816-819
[10] KOU Su-Peng. Fermion Bound States Around Skyrmions in Doped Antiferromagnets[J]. Chin. Phys. Lett., 2003, 20(8): 816-819
[11] YANG Hai-Peng, LU Xi-Feng, WEN Hai-Hu. Novel Transitions in Doped Mott-Insulator KxCoO2[J]. Chin. Phys. Lett., 2003, 20(5): 816-819
[12] WEN Hai-Hu, YANG Hai-Peng, LU Xi-Feng, YAN Jing. Superconductivity at 31 K in Alkaline Metal-Doped Cobalt Oxides[J]. Chin. Phys. Lett., 2003, 20(5): 816-819
[13] CHENG Nan-Pu, CHEN Zhi-Qian, CHEN-Hong. Level Statistics and Specific Heat of Metallic Nano-Particles[J]. Chin. Phys. Lett., 2003, 20(5): 816-819
[14] LUO Qiang, LIU Chuan. Mean-Field Calculations for the Three-Dimensional Holstein Model[J]. Chin. Phys. Lett., 2002, 19(8): 816-819
[15] ZHAO Li, LI Jian-Xin, GONG Chang-De, ZHAO Bai-Ru. Features in Quasi-particle Excitations and Tunneling Spectra due to Coupling to Spin Fluctuations in High-Tc Cuprates[J]. Chin. Phys. Lett., 2002, 19(7): 816-819
Viewed
Full text


Abstract