Superconductivity in W5SiB2 with the T2 phase structure

Michinori Fukuma; Kenji Kawashima; Masaki Maruyama; Jun Akimitsu

doi:10.1143/JPSJ.80.024702

Superconductivity in W₅SiB₂ with the T₂ phase structure

Michinori Fukuma, Kenji Kawashima, Masaki Maruyama, Jun Akimitsu

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We report here the superconducting properties of W₅SiB ₂. W5SiB₂ has a T₂ phase structure with the space group I4/mcm. Magnetic susceptibility, electrical resistivity, and specific heat data show that W₅SiB₂ is a superconductor with a transition temperature (T_c) of 5.8 K. The magnetization versus magnetic field (M-H) curve shows the typical type-II superconducting behavior. The estimated lower critical field H_c1(0) and upper critical field H_c2(0) are about 120 and 5200 Oe, respectively. The penetration depth λ and coherence length ξ are calculated to be approximately 210 and 25 nm, respectively, using Ginzburg-Landau (GL) equations. The estimated Sommerfeld coefficient γ_N is 12.8 mJ/(molK²). The normalized specific heat jump ΔC/γ_NT_c is estimated to be about 1.49, which is near the value predicted by the BCS theory in the weak-coupling limit, i.e., ΔC/γ_NT_c = 1:43. This finding indicates that superconductivity in W₅SiB ₂ exists within the week-coupling regime.

Original language	English
Article number	024702
Journal	journal of the physical society of japan
Volume	80
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.80.024702
Publication status	Published - Feb 2011
Externally published	Yes

Keywords

Superconductivity
T phase
WSiB

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Superconductivity in W5SiB2 with the T2 phase structure",

abstract = "We report here the superconducting properties of W5SiB 2. W5SiB2 has a T2 phase structure with the space group I4/mcm. Magnetic susceptibility, electrical resistivity, and specific heat data show that W5SiB2 is a superconductor with a transition temperature (Tc) of 5.8 K. The magnetization versus magnetic field (M-H) curve shows the typical type-II superconducting behavior. The estimated lower critical field Hc1(0) and upper critical field Hc2(0) are about 120 and 5200 Oe, respectively. The penetration depth λ and coherence length ξ are calculated to be approximately 210 and 25 nm, respectively, using Ginzburg-Landau (GL) equations. The estimated Sommerfeld coefficient γN is 12.8 mJ/(molK2). The normalized specific heat jump ΔC/γNTc is estimated to be about 1.49, which is near the value predicted by the BCS theory in the weak-coupling limit, i.e., ΔC/γNTc = 1:43. This finding indicates that superconductivity in W5SiB 2 exists within the week-coupling regime.",

keywords = "Superconductivity, T phase, WSiB",

author = "Michinori Fukuma and Kenji Kawashima and Masaki Maruyama and Jun Akimitsu",

year = "2011",

month = feb,

doi = "10.1143/JPSJ.80.024702",

language = "English",

volume = "80",

journal = "Journal of the Physical Society of Japan",

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TY - JOUR

T1 - Superconductivity in W5SiB2 with the T2 phase structure

AU - Fukuma, Michinori

AU - Kawashima, Kenji

AU - Maruyama, Masaki

AU - Akimitsu, Jun

PY - 2011/2

Y1 - 2011/2

N2 - We report here the superconducting properties of W5SiB 2. W5SiB2 has a T2 phase structure with the space group I4/mcm. Magnetic susceptibility, electrical resistivity, and specific heat data show that W5SiB2 is a superconductor with a transition temperature (Tc) of 5.8 K. The magnetization versus magnetic field (M-H) curve shows the typical type-II superconducting behavior. The estimated lower critical field Hc1(0) and upper critical field Hc2(0) are about 120 and 5200 Oe, respectively. The penetration depth λ and coherence length ξ are calculated to be approximately 210 and 25 nm, respectively, using Ginzburg-Landau (GL) equations. The estimated Sommerfeld coefficient γN is 12.8 mJ/(molK2). The normalized specific heat jump ΔC/γNTc is estimated to be about 1.49, which is near the value predicted by the BCS theory in the weak-coupling limit, i.e., ΔC/γNTc = 1:43. This finding indicates that superconductivity in W5SiB 2 exists within the week-coupling regime.

AB - We report here the superconducting properties of W5SiB 2. W5SiB2 has a T2 phase structure with the space group I4/mcm. Magnetic susceptibility, electrical resistivity, and specific heat data show that W5SiB2 is a superconductor with a transition temperature (Tc) of 5.8 K. The magnetization versus magnetic field (M-H) curve shows the typical type-II superconducting behavior. The estimated lower critical field Hc1(0) and upper critical field Hc2(0) are about 120 and 5200 Oe, respectively. The penetration depth λ and coherence length ξ are calculated to be approximately 210 and 25 nm, respectively, using Ginzburg-Landau (GL) equations. The estimated Sommerfeld coefficient γN is 12.8 mJ/(molK2). The normalized specific heat jump ΔC/γNTc is estimated to be about 1.49, which is near the value predicted by the BCS theory in the weak-coupling limit, i.e., ΔC/γNTc = 1:43. This finding indicates that superconductivity in W5SiB 2 exists within the week-coupling regime.

KW - Superconductivity

KW - T phase

KW - WSiB

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