Magnetization study of the heavy fermion superconductor CeCoIn5

Tayama, Takashi; Harita, A.; Sakakibara, Toshiro; Haga, Yoshinori; Shishido, Hiroaki; Settai, Rikio; Ōnuki, Yoshichika

doi:10.1016/s0022-3697(02)00008-2

Cited by 7 publications

(8 citation statements)

References 15 publications

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“…2(c), where the normal-state magnetization has been subtracted. Similar behavior was already reported in both high-κ dirty Ti-V alloys (κ ≈ 68) 32 and clean CeCoIn 5 (κ ≈ 100) 29,30 and represent direct evidence for the existence of strong paramagnetic effects in KFe 2 As 2 which become more and more important with decreasing temperatures.…”

Section: B Reversible Magnetizationsupporting

confidence: 86%

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Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2
Philipp
¹
,
Hardy
²
,
Aoki
³

et al. 2013
Phys. Rev. B
41
3
42
0
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KFe2As2 single crystals are studied using specific-heat, high-resolution thermal-expansion, magnetization, and magnetostriction measurements. The magnetization and magnetostriction data provide clear evidence for strong Pauli limiting effects of the upper critical field for magnetic fields parallel to the FeAs planes, suggesting that KFe2As2 may be a good candidate to search for the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. Using standard thermodynamic relations, the uniaxial pressure derivatives of the critical temperature (Tc), the normal-state Sommerfeld coefficient (γn), the normal-state susceptibility (χ), and the thermodynamic critical field (Hc) are calculated from our data. We find that the close relationship between doping and pressure as found in other Fe-based systems does not hold for KFe2As2.

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Section: B Reversible Magnetizationsupporting

confidence: 86%

“…These curves clearly exhibit several features characteristic of strongly Pauli-limited superconductors. [29][30][31] First, M(H) is negative, i.e. diamagnetic, only in a narrow low field interval 0 < H/H c2 < 0.3 and positive, i.e.…”

Section: B Reversible Magnetizationmentioning

confidence: 99%

Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2
Philipp
¹
,
Hardy
²
,
Aoki
³

et al. 2013
Phys. Rev. B
41
3
42
0
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“…This is typical of the FFLO phase in one-band systems in absence of orbital effects, and was shown in a number of theoretical [8,7,17,75,76,77,78,79,80] and experimental works. [9,10,11,12,16,81,82] Moreover, in FeSC more than one phase transition can be experimentally observed in the FFLO phase regime -at low temperature and high magnetic field (LTHM), [40,83,84] however there is a lack of clear evidence on the order of these transitions.…”

Section: H-t Phase Diagram and Phase Transitionmentioning

confidence: 99%

“…CeCoIn 5 which is a strong candidate for exhibiting this state. [9,10,11,12,13] It is a clean system, [14] with a layered structure suggesting a quasi-2D nature of electrons [15] and the Maki parameter is estimated to be α ≃ 5. [16] Moreover, theoretical works suggest that this phase can exist in the presence of impurities [17,18,19,20,21] and incommensurate spin density waves, [22,23] which is consistent with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

Influence of s± symmetry on unconventional superconductivity in pnictides above the Pauli limit – two-band model study

Ptok

2014

Eur. Phys. J. B

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Abstract. The theoretical analysis of the Cooper pair susceptibility shows the two-band Fe-based superconductors (FeSC) to support the existence of the phase with nonzero Cooper pair momentum (called the Fulde-Ferrel-Larkin-Ovchinnikov phase or shortly FFLO), regardless of the order parameter symmetry. Moreover this phase for the FeSC model with s± symmetry is the ground state of the system near the Pauli limit. This article discusses the phase diagram h-T for FeSC in the two-band model and its physical consequences. We compare the results for the superconducting order parameter with s-wave and s±-wave symmetry -in first case the FFLO phase can occur in both bands, while in second case only in one band. We analyze the resulting order parameter in real space -showing that the FeSC with s±-wave symmetry in the Pauli limit have typical properties of one-band systems, such as oscillations of the order parameter in real space with constant amplitude, whereas with s-wave symmetry the oscillations have an amplitude modulation. Discussing the free energy in the superconducting state we show that in absence of orbital effects, the phase transition from the BCS to the FFLO state is always first order, whereas from the FFLO phase to normal state is second order.

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“…It can be accessed from the derivatives ∂S/∂p, or ∂S/∂B, the volume thermal-expansion coefficient β = −V −1 • ∂S/∂p (V = molar volume) and the magnetization ∂M/∂T = ∂S/∂B, respectively. Measurements of M point to quantum criticality directly at or below B 0 c2 [16]. In the vortex phase, however, M cannot be used to determine ∂S/∂B due to irreversible flux motion.…”

mentioning

confidence: 99%

Towards the Identification of a Quantum Critical Line in the (p,B) Phase Diagram ofCeCoIn5with Thermal-Expansion Measurements

et al. 2011

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The low-temperature thermal expansion of CeCoIn5 single crystals measured parallel and perpendicular to magnetic fields B oriented along the c axis yields the volume thermal-expansion coefficient β. Considerable deviations of β(T ) from Fermi-liquid behavior occur already within the superconducting region of the (B, T ) phase diagram and become maximal at the upper critical field B 0 c2 . However, β(T ) and the Grüneisen parameter Γ are incompatible with a quantum critical point (QCP) at B 0 c2 , but allow for a QCP shielded by superconductivity and extending to negative pressures for B < B 0 c2 . Together with literature data we construct a tentative (p, B, T ) phase diagram of CeCoIn5 suggesting a quantum critical line in the (p, B) plane.

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Magnetization study of the heavy fermion superconductor CeCoIn5

Cited by 7 publications

References 15 publications

Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2
Philipp
¹
,
Hardy
²
,
Aoki
³

et al. 2013
Phys. Rev. B
41
3
42
0
View full text Add to dashboard Cite

Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2
Philipp
¹
,
Hardy
²
,
Aoki
³

et al. 2013
Phys. Rev. B
41
3
42
0
View full text Add to dashboard Cite

Influence of s± symmetry on unconventional superconductivity in pnictides above the Pauli limit – two-band model study

Towards the Identification of a Quantum Critical Line in the (p,B) Phase Diagram ofCeCoIn5with Thermal-Expansion Measurements

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Magnetization study of the heavy fermion superconductor CeCoIn5

Cited by 7 publications

References 15 publications

Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2Philipp1, Hardy2, Aoki3 et al. 2013Phys. Rev. B413420View full textAdd to dashboardCite

Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2Philipp1, Hardy2, Aoki3 et al. 2013Phys. Rev. B413420View full textAdd to dashboardCite

Influence of s± symmetry on unconventional superconductivity in pnictides above the Pauli limit – two-band model study

Towards the Identification of a Quantum Critical Line in the (p,B) Phase Diagram ofCeCoIn5with Thermal-Expansion Measurements

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Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2
Philipp
¹
,
Hardy
²
,
Aoki
³

et al. 2013
Phys. Rev. B
41
3
42
0
View full text Add to dashboard Cite

Strong Pauli-limiting behavior ofHc2and uniaxial pressure dependencies in KFe2As2
Philipp
¹
,
Hardy
²
,
Aoki
³

et al. 2013
Phys. Rev. B
41
3
42
0
View full text Add to dashboard Cite