Strong electron-Phonon coupling superconductivity induced by a low-Lying phonon in irGe

Daigorou Hirai; Mazhar N. Ali; Robert J. Cava

doi:10.7566/JPSJ.82.124701

Strong electron-Phonon coupling superconductivity induced by a low-Lying phonon in irGe

Daigorou Hirai, Mazhar N. Ali, Robert J. Cava

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

30 Scopus citations

Abstract

The physical properties of the previously reported superconductor IrGe and the Rh_1-xIr_xGe solid solution are investigated. IrGe has an exceptionally high superconducting transition temperature (T_c = 4.7 K) among the isostructural 1 : 1 late-metal germanides MGe (M 1/4 Rh, Pd, Ir, and Pt). Specific-heat measurements reveal that IrGe has an anomalously low Debye temperature, originating from a low-lying phonon, compared to the other MGe phases. A large jump at Tc in the specific-heat data clearly indicates that IrGe is a strong coupling superconductor. In the Rh_1-xIrxGe solid solution, a relationship between an anomalous change in lattice constants and the Debye temperature is observed. We conclude that the unusually high Tc for IrGe is likely due to strong electron-phonon coupling derived from the presence of a low-lying phonon.

Original language	English (US)
Article number	124701
Journal	Journal of the Physical Society of Japan
Volume	82
Issue number	12
DOIs	https://doi.org/10.7566/JPSJ.82.124701
State	Published - Dec 2013

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Keywords

IrGe
Low-Lying phonon
Strong electron-Phonon coupling
Superconductivity
Transition-Metal germanide

Access to Document

10.7566/JPSJ.82.124701

Cite this

@article{1747151079a74d269c94037f27ce9a58,

title = "Strong electron-Phonon coupling superconductivity induced by a low-Lying phonon in irGe",

abstract = "The physical properties of the previously reported superconductor IrGe and the Rh1-xIrxGe solid solution are investigated. IrGe has an exceptionally high superconducting transition temperature (Tc = 4.7 K) among the isostructural 1 : 1 late-metal germanides MGe (M 1/4 Rh, Pd, Ir, and Pt). Specific-heat measurements reveal that IrGe has an anomalously low Debye temperature, originating from a low-lying phonon, compared to the other MGe phases. A large jump at Tc in the specific-heat data clearly indicates that IrGe is a strong coupling superconductor. In the Rh1-xIrxGe solid solution, a relationship between an anomalous change in lattice constants and the Debye temperature is observed. We conclude that the unusually high Tc for IrGe is likely due to strong electron-phonon coupling derived from the presence of a low-lying phonon.",

keywords = "IrGe, Low-Lying phonon, Strong electron-Phonon coupling, Superconductivity, Transition-Metal germanide",

author = "Daigorou Hirai and Ali, {Mazhar N.} and Cava, {Robert J.}",

year = "2013",

month = dec,

doi = "10.7566/JPSJ.82.124701",

language = "English (US)",

volume = "82",

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

issn = "0031-9015",

publisher = "The Physical Society of Japan",

number = "12",

}

TY - JOUR

T1 - Strong electron-Phonon coupling superconductivity induced by a low-Lying phonon in irGe

AU - Hirai, Daigorou

AU - Ali, Mazhar N.

AU - Cava, Robert J.

PY - 2013/12

Y1 - 2013/12

N2 - The physical properties of the previously reported superconductor IrGe and the Rh1-xIrxGe solid solution are investigated. IrGe has an exceptionally high superconducting transition temperature (Tc = 4.7 K) among the isostructural 1 : 1 late-metal germanides MGe (M 1/4 Rh, Pd, Ir, and Pt). Specific-heat measurements reveal that IrGe has an anomalously low Debye temperature, originating from a low-lying phonon, compared to the other MGe phases. A large jump at Tc in the specific-heat data clearly indicates that IrGe is a strong coupling superconductor. In the Rh1-xIrxGe solid solution, a relationship between an anomalous change in lattice constants and the Debye temperature is observed. We conclude that the unusually high Tc for IrGe is likely due to strong electron-phonon coupling derived from the presence of a low-lying phonon.

AB - The physical properties of the previously reported superconductor IrGe and the Rh1-xIrxGe solid solution are investigated. IrGe has an exceptionally high superconducting transition temperature (Tc = 4.7 K) among the isostructural 1 : 1 late-metal germanides MGe (M 1/4 Rh, Pd, Ir, and Pt). Specific-heat measurements reveal that IrGe has an anomalously low Debye temperature, originating from a low-lying phonon, compared to the other MGe phases. A large jump at Tc in the specific-heat data clearly indicates that IrGe is a strong coupling superconductor. In the Rh1-xIrxGe solid solution, a relationship between an anomalous change in lattice constants and the Debye temperature is observed. We conclude that the unusually high Tc for IrGe is likely due to strong electron-phonon coupling derived from the presence of a low-lying phonon.

KW - IrGe

KW - Low-Lying phonon

KW - Strong electron-Phonon coupling

KW - Superconductivity

KW - Transition-Metal germanide

UR - http://www.scopus.com/inward/record.url?scp=84890951355&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84890951355&partnerID=8YFLogxK

U2 - 10.7566/JPSJ.82.124701

DO - 10.7566/JPSJ.82.124701

M3 - Article

AN - SCOPUS:84890951355

SN - 0031-9015

VL - 82

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 12

M1 - 124701

ER -

Strong electron-Phonon coupling superconductivity induced by a low-Lying phonon in irGe

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this