Pressure tuning of the double transition in thoriated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UBe</mml:mi></mml:mrow><mml:mrow><mml:mn>13</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Zieve, R. J.; Jin, Duo; Rosenbaum, T. F.; Kim, J. S.; Stewart, G. R.

doi:10.1103/physrevlett.72.756

Cited by 19 publications

(11 citation statements)

References 19 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We compare the behavior of the single transition in pure UBe 13 with that of both the upper and the lower transitions in U 0.97 Th 0.03 Be 13 . Debate continues on the nature of the lower thoriated transition, and on which (if either) of the thoriated transitions can be viewed as an extension of the single pure transition [1][2][3][4]. Our present measurements support identifying the lower thoriated transition with that of pure UBe 13 .…”

supporting

confidence: 51%

“…These values suggest that the lower transition in thoriated UBe 13 is a continuation of the phase boundary in the pure material. Work on the pressure-dependence of the transitions also supported this conclusion [2,3], although recent thermal expansion measurements did not [4]. The generally similar behavior of all three transitions is also evidence that the lower transition in U 0.97 Th 0.03 Be 13 is a superconducting transition.…”

mentioning

confidence: 85%

See 1 more Smart Citation

Reduction of critical temperatures in pure and thoriated UBe13 by columnar defects

Radovan

Behne

Zieve

et al. 2000

Physica C: Superconductivity

View full text Add to dashboard Cite

show abstract

supporting

confidence: 51%

mentioning

confidence: 85%

Reduction of critical temperatures in pure and thoriated UBe13 by columnar defects

Radovan

Behne

Zieve

et al. 2000

Physica C: Superconductivity

View full text Add to dashboard Cite

show abstract

“…Likewise, this could explain the increase in the lower critical field, B c1 , upon cooling through T c2 [26] as observed in the critical concentration range [10]. The additional phase boundary inferred from specific-heat measurements as a function of pressure [8] would then mark the onset of long-range order at x . x cr in accordance with the interpretation given in [9].…”

mentioning

confidence: 98%

Revision of the Phase Diagram of SuperconductingU1−xThx
Kromer
¹
,
Helfrich
²
,
Lang
³

et al. 1998
Phys. Rev. Lett.
Self Cite
68
5
79
1
View full text Add to dashboard Cite

Low-temperature specific-heat and thermal-expansion measurements on a single crystal of the heavyfermion superconductor UBe 13 reveal an anomaly in the superconducting state. The evolution of this feature is studied as a function of Th doping on several U 12x Th x Be 13 polycrystals (x # 0.03), giving rise to a new "line of anomalies," T L ͑x͒, in the T -x diagram. The anomaly at T L ͑x͒ marks the precursor of the lower of the two phase transitions at x . x cr ഠ 0.019. Implications for the interpretation of the phase diagram of superconducting U 12x Th x Be 13 are addressed. [S0031-9007(98)

show abstract

“…The earlier heat capacity measurements under pressure [19] drove the sample around rather than across the phase boundary: pressure was always changed at room temperature, with the sample then cooled into one phase or the other. Our bellows pressure cell allows us to change pressure while cold, thereby crossing the transition directly.…”

mentioning

confidence: 99%

Pressure and linear heat capacity in the superconducting state of thoriatedUBe13

2004

Self Cite

View full text Add to dashboard Cite

Even well below Tc, the heavy-fermion superconductor (U,Th)Be13 has a large linear term in its specific heat. We show that under uniaxial pressure, the linear heat capacity increases in magnitude by more than a factor of two. The change is reversible and suggests that the linear term is an intrinsic property of the material. In addition, we find no evidence of hysteresis or of latent heat in the low-temperature and low-pressure portion of the phase diagram, showing that all transitions in this region are second order. PACS numbers: 74.70.Tx,74.25.Bt For the past two decades, heavy-fermion superconductors have revealed a variety of unusual behaviors that hint at unconventional superconductivity [1]. Many low-temperature properties such as specific heat and NMR relaxation rates have power law rather than exponential temperature dependences. Two compounds, UPt 3 and U 1−x Th x Be 13 for x between 0.02 and 0.04, each have two transitions leading to distinct superconducting phases. Further phase transitions appear with pressure or applied magnetic field. Yet no experiment has emerged that conclusively identifies the order parameters of the phases or even their symmetry.One potential clue to heavy-fermion order parameters is the significant linear term in the thermal properties within the superconducting state. In theory linear heat capacity and thermal conductivity are normal-state phenomena, which should disappear once the superconducting energy gap alters the excitation spectrum. Yet specific heat C(T ) = γ s T + C non−linear (T ) in the superconducting phase is a persistent feature in heavy-fermion superconductors. The coefficient γ s can reach over 50% of γ n , the normal-state value of C(T )/T just above the transition. First seen in UPt 3 [2], a large γ s and an analogous linear term in thermal conductivity are also found in CeCoIn 5 [3], URu 2 Si 2 [4, 5], and UPd 2 Al 3 [6, 7], among others.The linear term is sometimes viewed as stemming entirely or in part from imperfect samples. One simple explanation would be that some fraction of the material remains normal. Another heavily discussed alternative, resonant impurity scattering, combines impurity effects with intrinsic features of the order parameter [8,9,10]. For a d-wave superconductor, a very small impurity concentration could create finite ungapped regions on the Fermi surface and a constant density of states. The strength, phase shift, and anisotropy of the impurity scattering and the impurity density all factor into the normal-like behavior. Yet other scenarios treat the linear term as an intrinsic property. These include involvement of only part of the Fermi surface in superconductivity, and the more exotic odd-frequency pairing [11].

show abstract

Pressure tuning of the double transition in thoriatedUBe13

Cited by 19 publications

References 19 publications

Reduction of critical temperatures in pure and thoriated UBe13 by columnar defects

Reduction of critical temperatures in pure and thoriated UBe13 by columnar defects

Revision of the Phase Diagram of SuperconductingU1−xThx
Kromer
¹
,
Helfrich
²
,
Lang
³

et al. 1998
Phys. Rev. Lett.
Self Cite
68
5
79
1
View full text Add to dashboard Cite

Pressure and linear heat capacity in the superconducting state of thoriatedUBe13

Contact Info

Product

Resources

About

Pressure tuning of the double transition in thoriatedUBe13

Cited by 19 publications

References 19 publications

Reduction of critical temperatures in pure and thoriated UBe13 by columnar defects

Reduction of critical temperatures in pure and thoriated UBe13 by columnar defects

Revision of the Phase Diagram of SuperconductingU1−xThxKromer1, Helfrich2, Lang3 et al. 1998Phys. Rev. Lett.Self Cite685791View full textAdd to dashboardCite

Pressure and linear heat capacity in the superconducting state of thoriatedUBe13

Contact Info

Product

Resources

About

Revision of the Phase Diagram of SuperconductingU1−xThx
Kromer
¹
,
Helfrich
²
,
Lang
³

et al. 1998
Phys. Rev. Lett.
Self Cite
68
5
79
1
View full text Add to dashboard Cite