Screening of transverse ac fields and influence of supercurrent on NMR Knight shift in high-Tc crystals

F. Yang; C. J. van der Beek; T. Shibauchi; Y. Matsuda; B. Da̧browski

doi:10.1016/j.physc.2007.03.386

Screening of transverse ac fields and influence of supercurrent on NMR Knight shift in high-T_c crystals

F. Yang
, C. J. van der Beek
, T. Shibauchi
, Y. Matsuda
, B. Da̧browski

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

Abstract

In the nuclear magnetic resonance (NMR) configuration with perpendicular constant (dc) field and radiofrequency (rf) magnetic field, a strong screening supercurrent is generated by the rf field. In order to estimate this current which may influence Knight shift data, we performed a model experiment in the NMR configuration on a YBa₂Cu₄O₈ single crystal. The differential magneto-optical imaging technique is used to determine the ac screening current distribution in the sample. We find that at T > 20 K, NMR experiments can be straightforwardly interpreted. At T < 20 K, the rf field is completely excluded. In this situation, NMR only probes the crystal edges; moreover, the Knight shift may be affected by the supercurrent flow.

Original language	English
Pages (from-to)	929-930
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	460-462 II
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.physc.2007.03.386
Publication status	Published - 1 Sept 2007
Externally published	Yes

Keywords

Doppler shift
Knight shift
Superconductor
d-Wave

Access to Document

10.1016/j.physc.2007.03.386

Cite this

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title = "Screening of transverse ac fields and influence of supercurrent on NMR Knight shift in high-Tc crystals",

abstract = "In the nuclear magnetic resonance (NMR) configuration with perpendicular constant (dc) field and radiofrequency (rf) magnetic field, a strong screening supercurrent is generated by the rf field. In order to estimate this current which may influence Knight shift data, we performed a model experiment in the NMR configuration on a YBa2Cu4O8 single crystal. The differential magneto-optical imaging technique is used to determine the ac screening current distribution in the sample. We find that at T > 20 K, NMR experiments can be straightforwardly interpreted. At T < 20 K, the rf field is completely excluded. In this situation, NMR only probes the crystal edges; moreover, the Knight shift may be affected by the supercurrent flow.",

keywords = "Doppler shift, Knight shift, Superconductor, d-Wave",

author = "F. Yang and \{van der Beek\}, \{C. J.\} and T. Shibauchi and Y. Matsuda and B. D{\c a}browski",

year = "2007",

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language = "English",

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TY - JOUR

T1 - Screening of transverse ac fields and influence of supercurrent on NMR Knight shift in high-Tc crystals

AU - Yang, F.

AU - van der Beek, C. J.

AU - Shibauchi, T.

AU - Matsuda, Y.

AU - Da̧browski, B.

PY - 2007/9/1

Y1 - 2007/9/1

N2 - In the nuclear magnetic resonance (NMR) configuration with perpendicular constant (dc) field and radiofrequency (rf) magnetic field, a strong screening supercurrent is generated by the rf field. In order to estimate this current which may influence Knight shift data, we performed a model experiment in the NMR configuration on a YBa2Cu4O8 single crystal. The differential magneto-optical imaging technique is used to determine the ac screening current distribution in the sample. We find that at T > 20 K, NMR experiments can be straightforwardly interpreted. At T < 20 K, the rf field is completely excluded. In this situation, NMR only probes the crystal edges; moreover, the Knight shift may be affected by the supercurrent flow.

AB - In the nuclear magnetic resonance (NMR) configuration with perpendicular constant (dc) field and radiofrequency (rf) magnetic field, a strong screening supercurrent is generated by the rf field. In order to estimate this current which may influence Knight shift data, we performed a model experiment in the NMR configuration on a YBa2Cu4O8 single crystal. The differential magneto-optical imaging technique is used to determine the ac screening current distribution in the sample. We find that at T > 20 K, NMR experiments can be straightforwardly interpreted. At T < 20 K, the rf field is completely excluded. In this situation, NMR only probes the crystal edges; moreover, the Knight shift may be affected by the supercurrent flow.

KW - Doppler shift

KW - Knight shift

KW - Superconductor

KW - d-Wave

U2 - 10.1016/j.physc.2007.03.386

DO - 10.1016/j.physc.2007.03.386

M3 - Article

AN - SCOPUS:34548250563

SN - 0921-4534

VL - 460-462 II

SP - 929

EP - 930

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SPEC. ISS.