77Se NMR study of the pairing symmetry and the spin dynamics in KyFe2-xSe2

Weiqiang Yu; L. Ma; J. B. He; D. M. Wang; T.-L. Xia; G. F. Chen; Wei Bao

doi:10.1103/PhysRevLett.106.197001

⁷⁷Se NMR study of the pairing symmetry and the spin dynamics in K_yFe_2-xSe₂

Weiqiang Yu^*, L. Ma, J. B. He, D. M. Wang, T.-L. Xia, G. F. Chen, Wei Bao

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

66 Citations (Scopus)

Abstract

We present a ⁷⁷Se NMR study of the newly discovered iron selenide superconductor K_yFe_2-xSe₂ , in which T_c =32K. Below T_c , the Knight shift ⁷⁷K drops sharply with temperature, providing strong evidence for singlet pairing. Above T_c , Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-T_c superconductivity in this iron selenide system.

Original language	English
Article number	197001
Journal	Physical Review Letters
Volume	106
Issue number	19
Online published	9 May 2011
DOIs	https://doi.org/10.1103/PhysRevLett.106.197001
Publication status	Published - 13 May 2011
Externally published	Yes

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title = "77Se NMR study of the pairing symmetry and the spin dynamics in KyFe2-xSe2",

abstract = "We present a 77Se NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2 , in which Tc =32K. Below Tc , the Knight shift 77K drops sharply with temperature, providing strong evidence for singlet pairing. Above Tc , Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-Tc superconductivity in this iron selenide system. ",

author = "Weiqiang Yu and L. Ma and He, {J. B.} and Wang, {D. M.} and T.-L. Xia and Chen, {G. F.} and Wei Bao",

year = "2011",

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language = "English",

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journal = "Physical Review Letters",

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T1 - 77Se NMR study of the pairing symmetry and the spin dynamics in KyFe2-xSe2

AU - Yu, Weiqiang

AU - Ma, L.

AU - He, J. B.

AU - Wang, D. M.

AU - Xia, T.-L.

AU - Chen, G. F.

AU - Bao, Wei

PY - 2011/5/13

Y1 - 2011/5/13

N2 - We present a 77Se NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2 , in which Tc =32K. Below Tc , the Knight shift 77K drops sharply with temperature, providing strong evidence for singlet pairing. Above Tc , Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-Tc superconductivity in this iron selenide system.

AB - We present a 77Se NMR study of the newly discovered iron selenide superconductor KyFe2-xSe2 , in which Tc =32K. Below Tc , the Knight shift 77K drops sharply with temperature, providing strong evidence for singlet pairing. Above Tc , Korringa-type relaxation indicates Fermi-liquid behavior. Our experimental results set strict constraints on the nature of possible theories for the mechanism of high-Tc superconductivity in this iron selenide system.

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U2 - 10.1103/PhysRevLett.106.197001

DO - 10.1103/PhysRevLett.106.197001

M3 - RGC 21 - Publication in refereed journal

SN - 0031-9007

VL - 106

JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

M1 - 197001

ER -