Low-temperature anomalies of the superconducting properties of Nd1.85Ce0.15CuO4-y

L. Alff; S. Meyer; S. Kleefisch; U. Schoop; K. Sengebusch; A. Marx; H. Sato; M. Naito; R. Gross

doi:10.1016/S0921-4526(99)02341-8

Low-temperature anomalies of the superconducting properties of Nd_1.85Ce_0.15CuO_4-y

L. Alff
, S. Meyer
, S. Kleefisch
, U. Schoop
, K. Sengebusch
, A. Marx
, H. Sato
, M. Naito
, R. Gross

University of Cologne
NTT Basic Research Laboratories

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

Abstract

We have measured the temperature dependence of the change Δλ_ab(T) = λ_ab(T) - λ_ab(T = 0) of the in-plane London penetration depth λ_ab in the electron-doped cuprate superconductor Nd_1.85Ce_0.15CuO_4-y (NCCO). An anomalous temperature dependence below about 4 K is observed. In contrast to the expected monotonous decrease of λ_ab(T) with decreasing temperature, λ_ab(T) is found to increase with decreasing temperature below 4 K resulting in a non-monotonous overall temperature dependence. This anomalous behavior was found to be absent in analogous measurements performed on Pr_1.85Ce_0.15CuO_4-y, (PCCO). From this, we conclude that the anomalous behavior of NCCO is caused by the influence of the Nd³⁺ magnetic moments. Correcting for the temperature-dependent susceptibility due to the Nd³⁺ moments, an exponential λ_ab(T) dependence is obtained indicating s-wave pairing in the electron-doped superconductors.

Original language	English
Pages (from-to)	999-1000
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	284-288
Issue number	PART I
DOIs	https://doi.org/10.1016/S0921-4526(99)02341-8
State	Published - 2000
Externally published	Yes

Keywords

Effects of doping and substitution
Magnetic properties
NdCeCuO
Penetration depth
PrCeCuO
Symmetry of the order parameter

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10.1016/S0921-4526(99)02341-8

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title = "Low-temperature anomalies of the superconducting properties of Nd1.85Ce0.15CuO4-y",

abstract = "We have measured the temperature dependence of the change Δλab(T) = λab(T) - λab(T = 0) of the in-plane London penetration depth λab in the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4-y (NCCO). An anomalous temperature dependence below about 4 K is observed. In contrast to the expected monotonous decrease of λab(T) with decreasing temperature, λab(T) is found to increase with decreasing temperature below 4 K resulting in a non-monotonous overall temperature dependence. This anomalous behavior was found to be absent in analogous measurements performed on Pr1.85Ce0.15CuO4-y, (PCCO). From this, we conclude that the anomalous behavior of NCCO is caused by the influence of the Nd3+ magnetic moments. Correcting for the temperature-dependent susceptibility due to the Nd3+ moments, an exponential λab(T) dependence is obtained indicating s-wave pairing in the electron-doped superconductors.",

keywords = "Effects of doping and substitution, Magnetic properties, NdCeCuO, Penetration depth, PrCeCuO, Symmetry of the order parameter",

author = "L. Alff and S. Meyer and S. Kleefisch and U. Schoop and K. Sengebusch and A. Marx and H. Sato and M. Naito and R. Gross",

year = "2000",

doi = "10.1016/S0921-4526(99)02341-8",

language = "English",

volume = "284-288",

pages = "999--1000",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

number = "PART I",

}

TY - JOUR

T1 - Low-temperature anomalies of the superconducting properties of Nd1.85Ce0.15CuO4-y

AU - Alff, L.

AU - Meyer, S.

AU - Kleefisch, S.

AU - Schoop, U.

AU - Sengebusch, K.

AU - Marx, A.

AU - Sato, H.

AU - Naito, M.

AU - Gross, R.

PY - 2000

Y1 - 2000

N2 - We have measured the temperature dependence of the change Δλab(T) = λab(T) - λab(T = 0) of the in-plane London penetration depth λab in the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4-y (NCCO). An anomalous temperature dependence below about 4 K is observed. In contrast to the expected monotonous decrease of λab(T) with decreasing temperature, λab(T) is found to increase with decreasing temperature below 4 K resulting in a non-monotonous overall temperature dependence. This anomalous behavior was found to be absent in analogous measurements performed on Pr1.85Ce0.15CuO4-y, (PCCO). From this, we conclude that the anomalous behavior of NCCO is caused by the influence of the Nd3+ magnetic moments. Correcting for the temperature-dependent susceptibility due to the Nd3+ moments, an exponential λab(T) dependence is obtained indicating s-wave pairing in the electron-doped superconductors.

AB - We have measured the temperature dependence of the change Δλab(T) = λab(T) - λab(T = 0) of the in-plane London penetration depth λab in the electron-doped cuprate superconductor Nd1.85Ce0.15CuO4-y (NCCO). An anomalous temperature dependence below about 4 K is observed. In contrast to the expected monotonous decrease of λab(T) with decreasing temperature, λab(T) is found to increase with decreasing temperature below 4 K resulting in a non-monotonous overall temperature dependence. This anomalous behavior was found to be absent in analogous measurements performed on Pr1.85Ce0.15CuO4-y, (PCCO). From this, we conclude that the anomalous behavior of NCCO is caused by the influence of the Nd3+ magnetic moments. Correcting for the temperature-dependent susceptibility due to the Nd3+ moments, an exponential λab(T) dependence is obtained indicating s-wave pairing in the electron-doped superconductors.

KW - Effects of doping and substitution

KW - Magnetic properties

KW - NdCeCuO

KW - Penetration depth

KW - PrCeCuO

KW - Symmetry of the order parameter

UR - https://www.scopus.com/pages/publications/0033717142

U2 - 10.1016/S0921-4526(99)02341-8

DO - 10.1016/S0921-4526(99)02341-8

M3 - Article

AN - SCOPUS:0033717142

SN - 0921-4526

VL - 284-288

SP - 999

EP - 1000

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - PART I

ER -

Low-temperature anomalies of the superconducting properties of Nd_1.85Ce_0.15CuO_4-y

Abstract

Keywords

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