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Your search keyword '"Young, B. L."' showing total 5 results
Start Over Author "Young, B. L." Topic superconductivity
5 results on '"Young, B. L."'

1. Coexistence of antiferromagnetism and superconductivity in CeCo(In0.9Cd0.1)5: A spin lattice relaxation study

Author

Urbano, RR, Young, B-L, Curro, NJ, Thompson, JD, Pham, LD, and Fisk, Z

Subjects
heavy fermions, magnetism, superconductivity, NMR, Condensed Matter Physics, Quantum Physics, Macromolecular and Materials Chemistry, General Physics
Abstract

We present an In(1) NQR study on the heavy-fermion (HF) compound CeCo(In1-xCdx)5(x = 0.10) . Bulk measurements indicate that Cd doping acts as an electronic tuning agent in CeCoIn5, and that superconductivity (SC) and antiferromagnetism (AFM) may coexist at ambient pressure for 0.05 < x < 0.15. For x = 0.10, the nuclear spin lattice relaxation rate shows a broad peak at the Néel temperature TN = 2.8 K, with a subsequent onset of SC at Tc ≃ 1.2 K. Our results provide strong evidence for microscopic coexistence of these two ground states. The nuclear magnetization recovery curves in both the ordered and mixed states reveal a single T1-component, which suggests a homogeneous nature of the Ce-4f1 electronic state. © 2007 Elsevier B.V. All rights reserved.

Published
2008

3. Interplay Of Magnetism And Superconductivity In Cecoin5.

Author

Movshovich, R., Tokiwa, Y., Ronning, F., Bianchi, A., Capan, C., Young, B. L., Urbano, R. R., Curro, N. J., Park, T., Thompson, J. D., Bauer, E., and Sarrao, J. L.

Abstract

CeCoIn5 is a heavy fermion superconductor which appears to be straddling the boundary between the superconducting and magnetic ground states. At the superconducting critical field Hc2 this material displays NFL behavior in transport and thermodynamic properties, pointing at a Quantum Critical Point (QCP) at Hc2, and hinting at the presence of magnetic fluctuations, probably due to an AFM order superseded by the superconductivity. In the High-Field-Low-Temperature (HFLT) corner of the superconducting phase of CeCoIn5, within 20% off Hc2, an additional phase appears within the superconducting phase, and the normal-to-superconducting transition itself becomes first order. This behavior is consistent with a strong Pauli limited superconductivity, and the low temperature high field phase being an inhomogeneous superconducting FFLO phase. Recent NMR experiments, however, point to a long range magnetic order within HFLT state. Experiments on CeRhIn5 under pressure show magnetic field induced AFM order within the superconducting phase, with some similarities to the phase diagram of CeCoIn5. Could the HFLT phase transition be due to magnetic order? Importantly, the HFLT phase does not extend into the normal state above Hc2. We need a picture of a magnetism ˵attracted″ to superconductivity to explain the data on the HFLT phase in CeCoIn5. [ABSTRACT FROM AUTHOR]

Published
2009
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4. Coexistence of antiferromagnetism and superconductivity in CeCo(In0.9Cd0.1)5: A spin lattice relaxation study

Author

Urbano, R.R., Young, B.-L., Curro, N.J., Thompson, J.D., Pham, L.D., and Fisk, Z.

Subjects
*ANTIFERROMAGNETISM, *SUPERCONDUCTIVITY, *FERMIONS, *SEMICONDUCTOR doping
Abstract

Abstract: We present an In(1) NQR study on the heavy-fermion (HF) compound CeCo(In1−x Cd x )5 . Bulk measurements indicate that Cd doping acts as an electronic tuning agent in CeCoIn5, and that superconductivity (SC) and antiferromagnetism (AFM) may coexist at ambient pressure for . For , the nuclear spin lattice relaxation rate shows a broad peak at the Néel temperature , with a subsequent onset of SC at . Our results provide strong evidence for microscopic coexistence of these two ground states. The nuclear magnetization recovery curves in both the ordered and mixed states reveal a single -component, which suggests a homogeneous nature of the Ce-4f1 electronic state. [Copyright &y& Elsevier]

Published
2008
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5. Probing the magnetism in the CeMIn5 heavy fermion systems by NMR

Author

Curro, N.J., Urbano, R.R., and Young, B.-L.

Subjects
*FERMIONS, *MAGNETISM, *ANTIFERROMAGNETISM, *NUCLEAR magnetic resonance
Abstract

Abstract: The heavy fermion system exhibits antiferromagnetism for both and . is antiferromagnetic at ambient pressure and superconducting under hydrostatic pressure, whereas is superconducting at ambient pressure, but becomes antiferromagnetic with substitution of In by a few percent of Cd. Pure exhibits a field-induced magnetic phase that coexists with the superconductivity. Nuclear magnetic resonance (NMR) and nuclear quadrupolar resonance (NQR) studies of the In(1), In(2) and Co sites reveal similar features in the magnetic states of these systems. [Copyright &y& Elsevier]

Published
2008
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