Order parameter of MgB2: A fully gapped superconductor

H. D. Yang, J. Y. Lin, H. H. Li, F. H. Hsu, Chia-Jyi Liu, S. C. Li, R. C. Yu, C. Q. Jin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have measured the low-temperature specific heat C(T) for polycrystalline MgB2 prepared by high pressure synthesis. C(T) below 10 K vanishes exponentially, which unambiguously indicates a fully opened superconducting energy gap. However, this gap is found to be too small to account for Tc of MgB2. Together with the small specific heat jump ΔC/γnTc = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of γ(H) is neither linear for a fully gapped s-wave superconductor nor H1/2 for nodal order parameter. It seems that this intriguing behavior of γ(H) is associated with the intrinsic electronic properties other than flux pinning.

Original languageEnglish
JournalPhysical Review Letters
Volume87
Issue number16
DOIs
Publication statusPublished - 2001 Sep 26

Fingerprint

specific heat
flux pinning
synthesis
electronics
magnetic fields

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Yang, H. D., Lin, J. Y., Li, H. H., Hsu, F. H., Liu, C-J., Li, S. C., ... Jin, C. Q. (2001). Order parameter of MgB2: A fully gapped superconductor. Physical Review Letters, 87(16). https://doi.org/10.1103/PhysRevLett.87.167003
Yang, H. D. ; Lin, J. Y. ; Li, H. H. ; Hsu, F. H. ; Liu, Chia-Jyi ; Li, S. C. ; Yu, R. C. ; Jin, C. Q. / Order parameter of MgB2 : A fully gapped superconductor. In: Physical Review Letters. 2001 ; Vol. 87, No. 16.
@article{591be0ce17594cf6a0b5883e5f40364c,
title = "Order parameter of MgB2: A fully gapped superconductor",
abstract = "We have measured the low-temperature specific heat C(T) for polycrystalline MgB2 prepared by high pressure synthesis. C(T) below 10 K vanishes exponentially, which unambiguously indicates a fully opened superconducting energy gap. However, this gap is found to be too small to account for Tc of MgB2. Together with the small specific heat jump ΔC/γnTc = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of γ(H) is neither linear for a fully gapped s-wave superconductor nor H1/2 for nodal order parameter. It seems that this intriguing behavior of γ(H) is associated with the intrinsic electronic properties other than flux pinning.",
author = "Yang, {H. D.} and Lin, {J. Y.} and Li, {H. H.} and Hsu, {F. H.} and Chia-Jyi Liu and Li, {S. C.} and Yu, {R. C.} and Jin, {C. Q.}",
year = "2001",
month = "9",
day = "26",
doi = "10.1103/PhysRevLett.87.167003",
language = "English",
volume = "87",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "16",

}

Yang, HD, Lin, JY, Li, HH, Hsu, FH, Liu, C-J, Li, SC, Yu, RC & Jin, CQ 2001, 'Order parameter of MgB2: A fully gapped superconductor', Physical Review Letters, vol. 87, no. 16. https://doi.org/10.1103/PhysRevLett.87.167003

Order parameter of MgB2 : A fully gapped superconductor. / Yang, H. D.; Lin, J. Y.; Li, H. H.; Hsu, F. H.; Liu, Chia-Jyi; Li, S. C.; Yu, R. C.; Jin, C. Q.

In: Physical Review Letters, Vol. 87, No. 16, 26.09.2001.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Order parameter of MgB2

T2 - A fully gapped superconductor

AU - Yang, H. D.

AU - Lin, J. Y.

AU - Li, H. H.

AU - Hsu, F. H.

AU - Liu, Chia-Jyi

AU - Li, S. C.

AU - Yu, R. C.

AU - Jin, C. Q.

PY - 2001/9/26

Y1 - 2001/9/26

N2 - We have measured the low-temperature specific heat C(T) for polycrystalline MgB2 prepared by high pressure synthesis. C(T) below 10 K vanishes exponentially, which unambiguously indicates a fully opened superconducting energy gap. However, this gap is found to be too small to account for Tc of MgB2. Together with the small specific heat jump ΔC/γnTc = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of γ(H) is neither linear for a fully gapped s-wave superconductor nor H1/2 for nodal order parameter. It seems that this intriguing behavior of γ(H) is associated with the intrinsic electronic properties other than flux pinning.

AB - We have measured the low-temperature specific heat C(T) for polycrystalline MgB2 prepared by high pressure synthesis. C(T) below 10 K vanishes exponentially, which unambiguously indicates a fully opened superconducting energy gap. However, this gap is found to be too small to account for Tc of MgB2. Together with the small specific heat jump ΔC/γnTc = 1.09, scenarios such as anisotropic s-wave or multicomponent order parameter are called for. The magnetic field dependence of γ(H) is neither linear for a fully gapped s-wave superconductor nor H1/2 for nodal order parameter. It seems that this intriguing behavior of γ(H) is associated with the intrinsic electronic properties other than flux pinning.

UR - http://www.scopus.com/inward/record.url?scp=85038317451&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85038317451&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.87.167003

DO - 10.1103/PhysRevLett.87.167003

M3 - Article

AN - SCOPUS:85038317451

VL - 87

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 16

ER -