Josephson plasma resonance in the mixed state of the organic superconductor κ-(BEDT-TTF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Cu(NCS<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Shibauchi, T.; Sato, Munehiko; Mashio, Asami S.; Tamegai, T.; Mori, H.; Tajima, S.; Tanaka, Shōji

doi:10.1103/physrevb.55.r11977

Cited by 50 publications

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“…As λ ⊥ (0) is large we are able to determine its absolute value directly from our measurements. We obtain λ ⊥ (0) = 100 ± 20µm which is comparable to previous measurements [17,32,33]. As shown in the figure, ρ ⊥ is also strongly temperature dependent at low temperature.…”

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confidence: 76%

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2
Carrington
¹
,
Bonalde
²
,
Prozorov
³

et al. 1999
Phys. Rev. Lett.
144
19
122
0
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We present high precision measurements of the penetration depth of single crystals of κ−(ET)2Cu[N(CN)2]Br and κ−(ET)2Cu(NCS)2 at temperatures down to 0.4 K. We find that, at low temperatures, the in-plane penetration depth (λ ) varies as a fractional power law, λ ∼ T 3 2 . Whilst this may be taken as evidence for novel pair excitation processes, we show that the data are also consistent with a quasilinear variation of the superfluid density, as is expected for a d-wave superconductor with impurities or a small residual gap. Our data for the interplane penetration depth show similar features and give a direct measurement of the absolute value, λ ⊥ (0) = 100 ± 20 µm.PACS numbers: 74.70. Kn, 74.25.Nf Compounds of the family κ−(ET) 2 X have the highest transition temperatures of all organic superconductors known to date [1]. They have recently attracted considerable attention because of their similarity to the high T c cuprates and the possibility that they may also have a non-conventional paring state [2]. The two materials studied here, κ−(ET) 2 Cu[N(CN) 2 ]Br (T c ∼ 11.6 K) and κ−(ET) 2 Cu(NCS) 2 (T c ∼ 9.6 K), are highly anisotropic, layered, extreme type II superconductors. As in the cuprates, the superconducting phase in these materials is in close proximity to an antiferromagnetic phase. Both antiferromagnetic spin fluctuations and a pseudogap have been detected in NMR measurements in the normal state [3]. Neither the underlying pairing mechanism nor the symmetry of the order parameter has been conclusively established. Although NMR [4,5], specific heat [6] and thermal conductivity [7] measurements all suggest a non-conventional pairing state, results of penetration depth measurements have been inconsistent, with evidence for both conventional [8,9] and non-conventional [10][11][12] behavior. However, none of these penetration depth measurements have been performed over a temperature range (T /T c ) and a precision, comparable to those in the cuprates [13]. In this Letter, we present measurements of both the in-plane λ , and the interplane, λ ⊥ , penetration depths in κ−(ET) 2 Cu[N(CN) 2 ]Br and κ−(ET) 2 Cu(NCS) 2 at temperatures down to 0.4 K.Our measurements were performed on single crystals of κ−(ET) 2 Cu[N(CN) 2 ]Br and κ−(ET) 2 Cu(NCS) 2 which were grown at Argonne National Laboratory. Details of the growth procedures have been given elsewhere [14]. Penetration depth measurements were performed using a 13 MHz tunnel diode oscillator [15] mounted on a 3 He refrigerator. The low noise level [ ∆F F0 ≃ 10 −9 ], and low drift of the oscillator allows us to obtain high resolution data with a very small temperature spacing interval. The samples were attached, with a small amount of vacuum grease, to a sapphire rod which fitted inside the copper sense coil. The sense coil was calibrated using spheres of Aluminum. The sample temperature was measured with a calibrated Cernox thermometer attached to the other end of the sapphire rod. The samples were cooled slowly (0.1-1.0 K/min) to avoid introducing disorder [1...

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confidence: 76%

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2
Carrington
¹
,
Bonalde
²
,
Prozorov
³

et al. 1999
Phys. Rev. Lett.
144
19
122
0
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“…Bi 2 (Sr,La) 2 CuO 6+δ (Bi2201), 17 YBa 2 Cu 3 O 7−δ (YBCO), 18 and BEDT-TTF salts, 19 in which the Josephson plasma resonance (edge) is less clear.…”

mentioning

confidence: 99%

Two phase collective modes in a Josephson vortex lattice in the intrinsic Josephson junctionBi2Sr2CaCu2O
Kakeya
¹
,
Wada
²
,
Nakamura
³

et al. 2005
Phys. Rev. B
15
2
17
1
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Josephson plasma excitations in the high Tc superconductor Bi2Sr2CaCu2O 8+δ have been investigated in a wide microwave frequency region (9.8 -75 GHz), in particular, in magnetic field applied parallel to the ab plane of the single crystal. In sharp contrast to the case for magnetic fields parallel to the c axis or tilted from the ab plane, it was found that there are two kinds of resonance modes, which are split in energy and possess two distinctly different magnetic field dependences. One always lies higher in energy than the other and has a shallow minimum at about 0.8 kOe, then increases linearly with magnetic field. On the other hand, another mode begins to appear only in a magnetic field (from a few kOe and higher) and has a weakly decreasing tendency with increasing magnetic field. By comparing with a recent theoretical model the higher energy mode can naturally be attributed to the Josephson plasma resonance mode propagating along the primitive reciprocal lattice vector of the Josephson vortex lattice, whereas the lower frequency mode is assigned to the novel phase collective mode of the Josephson vortex lattice, which has never been observed before.

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“…In the past decade, an interlayer Josephson plasma resonance (JPR) has been observed in many layered superconductors, including the title compound [4,5], the HTS [6][7][8], and other organic conductors [9]. This JPR has been used extensively to investigate the Q2D vortex phase diagram, since the JPR frequency is strongly influenced by the interlayer spatial correlations between pancake vortices.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of the Josephson plasma resonance between vortex phases in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

Benjamin

Takahashi

Hill

et al. 2004

Solid State Communications

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Josephson plasma resonance in the mixed state of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

Cited by 50 publications

References 0 publications

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2
Carrington
¹
,
Bonalde
²
,
Prozorov
³

et al. 1999
Phys. Rev. Lett.
144
19
122
0
View full text Add to dashboard Cite

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2
Carrington
¹
,
Bonalde
²
,
Prozorov
³

et al. 1999
Phys. Rev. Lett.
144
19
122
0
View full text Add to dashboard Cite

Two phase collective modes in a Josephson vortex lattice in the intrinsic Josephson junctionBi2Sr2CaCu2O
Kakeya
¹
,
Wada
²
,
Nakamura
³

et al. 2005
Phys. Rev. B
15
2
17
1
View full text Add to dashboard Cite

Temperature dependence of the Josephson plasma resonance between vortex phases in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

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Josephson plasma resonance in the mixed state of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

Cited by 50 publications

References 0 publications

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2Carrington1, Bonalde2, Prozorov3 et al. 1999Phys. Rev. Lett.144191220View full textAdd to dashboardCite

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2Carrington1, Bonalde2, Prozorov3 et al. 1999Phys. Rev. Lett.144191220View full textAdd to dashboardCite

Two phase collective modes in a Josephson vortex lattice in the intrinsic Josephson junctionBi2Sr2CaCu2OKakeya1, Wada2, Nakamura3 et al. 2005Phys. Rev. B152171View full textAdd to dashboardCite

Temperature dependence of the Josephson plasma resonance between vortex phases in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2

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Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2
Carrington
¹
,
Bonalde
²
,
Prozorov
³

et al. 1999
Phys. Rev. Lett.
144
19
122
0
View full text Add to dashboard Cite

Low-Temperature Penetration Depth ofκ−(ET)2Cu[N(CN)2
Carrington
¹
,
Bonalde
²
,
Prozorov
³

et al. 1999
Phys. Rev. Lett.
144
19
122
0
View full text Add to dashboard Cite

Two phase collective modes in a Josephson vortex lattice in the intrinsic Josephson junctionBi2Sr2CaCu2O
Kakeya
¹
,
Wada
²
,
Nakamura
³

et al. 2005
Phys. Rev. B
15
2
17
1
View full text Add to dashboard Cite