Field Dependence of the Ground State in the Exotic Superconductor CeCoIn${}_5$: a Nuclear Magnetic Resonance Investigation

Abstract

We report ${}^{115}$In nuclear magnetic resonance (NMR) measurements in CeCoIn${}_5$ at low temperature ($T\approx 70$ mK) as a function of magnetic field ($H_0$) from 2 T to 13.5 T applied perpendicular to the $\hat{c}$-axis. NMR line shift reveals that below 10 T the spin susceptibility increases as $\sqrt{H_0}$. We associate this with an increase of the density of states due to the Zeeman and Doppler-shifted quasiparticles extended outside the vortex cores in a d-wave superconductor. Above 10 T a new superconducting state is stabilized, possibly the modulated phase predicted by Fulde, Ferrell, Larkin and Ovchinnikov (FFLO). This phase is clearly identified by a strong and linear increase of the NMR shift with the field, before a jump at the first order transition to the normal state.

arXiv comment4 pages, to appear in Phys. Rev. Lett

References in corpus (18)

• Heavy-fermion superconductivity in CeCoIn5 at 2.3K
• Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in CeCoIn5
• Calorimetric Evidence for a Fulde-Ferrell-Larkin-Ovchinnikov Superconducting State in the Layered Organic Superconductor κ$-(BEDT-TTF)$_2$Cu(NCS)$_2$
• Microscopic evidence for field-induced magnetism in CeCoIn${}_5$
• Anomalous NMR Magnetic Shifts in CeCoIn_5
• Structure of the Fulde-Ferrell-Larkin-Ovchinnikov state in two-dimensional superconductors
• Unpaired Electrons in the Heavy-Fermion Superconductor CeCoIn_{5}
• Interacting Antiferromagnetic Droplets in Quantum Critical CeCoIn_5
• Vortex states in superconductors with strong Pauli-paramagnetic effect
• Anisotropic spin fluctuations in heavy-fermion superconductor CeCoIn5: In-NQR and Co-NMR studies
• Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn${}_5$
• Three-dimensionality of field-induced magnetism in a high-temperature superconductor
• Non-Locality and Strong Coupling in the Heavy Fermion Superconductor CeCoIn${}_5$: A Penetration Depth Study
• CeCoIn5 - a quantum critical superfluid
• Local tunneling spectroscopy as signatures of the Fulde-Ferrell-Larkin-Ovchinnikov state in s- and d-wave Superconductors
• Vortex state in a Fulde-Ferrell-Larkin-Ovchinnikov superconductor based on the quasiclassical theory
• Fermi-liquid effects in the Fulde-Ferrell-Larkin-Ovchinnikov state of two-dimensional d-wave superconductors
• Phase Diagram of CeCoIn_5 in the Vicinity of H_{c2} as Determined by NMR

Cited by in corpus (24)

• Field Evolution of Coexisting Superconducting and Magnetic Orders in CeCoIn${}_5$
• Antiferromagnetic Order and π-triplet Pairing in the Fulde-Ferrell-Larkin-Ovchinnikov State
• Nuclear magnetic resonance in the heavy fermion superconductors
• Antiferromagnetism and Superconductivity in Cerium based Heavy Fermion Compounds
• Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field
• Inherent spin density wave instability by vortices in superconductors with strong Pauli effects
• Evolution of the spin resonance in CeCoIn${}_5$ under magnetic field
• The ab initio study of unconventional superconductivity in CeCoIn${}_5$ and FeSe
• Coexistence of superconductivity and incommensurate magnetic order
• Population imbalanced lattice fermions near the BCS-BEC crossover: II. The FFLO regime and its thermal signatures
• Strong coupling s-wave superconductors in the extreme Pauli limit: I.The breached pair and metastable FFLO phases
• Population imbalanced lattice fermions near the BCS-BEC crossover: I.The breached pair and metastable FFLO phases
• Disordered Fulde-Ferrel-Larkin-Ovchinnikov State in d-wave Superconductors
• Anomalous transition temperature oscillations in LOFF state
• Field Evolution of the Fulde-Ferrell-Larkin-Ovchinnikov State in a Superconductor with Strong Pauli Effects
• Hyperfine fields and magnetic structure in the B phase of CeCoIn5
• Magnetic structure of antiferromagnetic Fulde-Ferrell-Larkin-Ovchinnikov state
• Knight shift spectrum in vortex states in s-wave and d-wave superconductors on the basis of Eilenberger theory
• Ginzburg-Landau Analysis for the Antiferromagnetic Order in the Fulde-Ferrell-Larkin-Ovchinnikov Superconductor
• Application of Surface Coil for Nuclear Magnetic Resonance Studies of Semi-conducting Thin Films
• Pauli limited d-wave superconductors: Quantum breached pair phase and thermal transitions
• Antiferromagnetic Phases in the Fulde-Ferrell-Larkin-Ovchinnikov State of CeCoIn_5
• NMR Studies of Field Induced Magnetism in CeCoIn${}_5$
• Dynamic Simulations of Strongly Coupled Spin Ensembles for Inferring Nature of Electronic Correlations from Nuclear Magnetic Resonance