Evolution of Superconducting and Hidden Order Phases in URu2Si2 Under Applied Pressure

AbstractElectrical resistivity measurements performed under applied hydrostatic pressure and in magnetic fields have been used to probe the hidden order (HO) and superconducting (SC) states of URu2Si2, which have ambient-pressure transition temperatures TO = 17.5 K and Tc = 1.5 K, respectively. TO increases with applied pressure and a distinct kink in its pressure dependence is observed at 15 kbar; this feature is associated with the onset of antiferromagnetism. The pressure dependence of the SC upper critical field has been measured with the external field aligned parallel to both crystalline axes. The SC phase is smoothly suppressed to a critical pressure of about 15 kbar and no qualitative change in the critical field curves is observed. The co-evolution of the HO and SC phases is discussed within the context of a model in which the two phases compete for Fermi surface fraction.

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Upward Curvature of the Upper Critical Field and the V-Shaped Pressure Dependence of T c in the Noncentrosymmetric Superconductor PbTaSe2

Journal of Superconductivity and Novel Magnetism ◽

10.1007/s10948-015-3177-4 ◽

2015 ◽

Vol 28 (11) ◽

pp. 3173-3178 ◽

Cited By ~ 11

Author(s):

Jianrui Wang ◽

Xiaofeng Xu ◽

Nan Zhou ◽

Lin Li ◽

Xiaozhi Cao ◽

...

Keyword(s):

Critical Field ◽

Pressure Dependence ◽

Upper Critical Field ◽

Noncentrosymmetric Superconductor ◽

Upward Curvature

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Coexistence of superconductivity and spin density wave orderings in Bechgaard and Fabre salts

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:20020394 ◽

2002 ◽

Vol 12 (9) ◽

pp. 197-200

Author(s):

C. Pasquier ◽

P. Auban-Senzier ◽

T. Vuletic ◽

S. Tomic ◽

M. Heritier ◽

...

Keyword(s):

Magnetic Field ◽

Spin Density ◽

Critical Field ◽

Density Wave ◽

Spin Density Wave ◽

Upper Critical Field ◽

Small Range ◽

Zero Field ◽

Pressure Independent ◽

Two Phases

In a small range of pressure, superconductivity (SC) and Spin Density Wave (SDW) states are shown to coexist in the Bechgaard salt (TMTSF)2PF6 and the Fabre salt (TMTTF)2BF4. In (TMTSF)2PF6, a precise investigation of the (P,T) phase diagram has led us to demonstrate the coexistence of the two phases with a superconducting critical temperature which is pressure independent while the critical current at zero field is strongly depressed as the pressure is decreased. In (TMTTF)2BF4, using non-linear transport measurements, we present the signature of the presence of 1D superconducting filaments in a small range of pressure. We also investigate the compound under a magnetic field applied along the c*-axis: the upper critical field is more or less pressure independent and is about 2 Tesla (at zero temperature). We suggest that such a high critical field is compatible with the penetration of the magnetic field in the insulating regions of the compound in a similar way of Josephson vortices in layered superconductors.

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Pressure dependence of the upper critical field ofMgB2and ofYNi2B2C

Physical Review B ◽

10.1103/physrevb.70.134518 ◽

2004 ◽

Vol 70 (13) ◽

Cited By ~ 40

Author(s):

H. Suderow ◽

V. G. Tissen ◽

J. P. Brison ◽

J. L. Martínez ◽

S. Vieira ◽

...

Keyword(s):

Critical Field ◽

Pressure Dependence ◽

Upper Critical Field

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Pressure Dependence of Upper Critical Field in β-Pyrochlore Oxides

Journal of the Physical Society of Japan ◽

10.1143/jpsjs.80sa.sa040 ◽

2011 ◽

Vol 80 (Suppl.A) ◽

pp. SA040 ◽

Cited By ~ 3

Author(s):

D. Iguchi ◽

T. Isono ◽

Y. Machida ◽

K. Izawa ◽

B. Salce ◽

...

Keyword(s):

Critical Field ◽

Pressure Dependence ◽

Upper Critical Field ◽

Pyrochlore Oxides

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Pressure Dependence of the Upper Critical Field of the Heavy Fermion SuperconductorUBe13

Physical Review Letters ◽

10.1103/physrevlett.82.169 ◽

1999 ◽

Vol 82 (1) ◽

pp. 169-172 ◽

Cited By ~ 27

Author(s):

L. Glémot ◽

J. P. Brison ◽

J. Flouquet ◽

A. I. Buzdin ◽

I. Sheikin ◽

...

Keyword(s):

Critical Field ◽

Pressure Dependence ◽

Heavy Fermion ◽

Upper Critical Field

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NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe3

International Journal of Modern Physics B ◽

10.1142/s0217979207044287 ◽

2007 ◽

Vol 21 (18n19) ◽

pp. 3238-3245 ◽

Cited By ~ 29

Author(s):

R. SETTAI ◽

Y. OKUDA ◽

I. SUGITANI ◽

Y. ŌNUKI ◽

T. D. MATSUDA ◽

...

Keyword(s):

Crystal Structure ◽

Electrical Resistivity ◽

Critical Field ◽

Heavy Fermion ◽

Ambient Pressure ◽

Upper Critical Field ◽

Inversion Symmetry ◽

Tetragonal Crystal ◽

Tetragonal Crystal Structure ◽

Heavy Fermion Superconductivity

We measured the electrical resistivity under pressure for an antiferromagnet CeCoGe 3 without inversion symmetry in the tetragonal crystal structure. The Néel temperature T N1 = 21 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero at about 5.5 GPa. Superconductivity appears above 4.3 GPa, with a superconduting transition temperature T sc = 0.72 K and a large upper critical field H c2 (0) = 7 T at 5.6 GPa. The large upper critical field H c2 (0)= 7 T exceeds the Pauli limitting field H p (≃ 1.86T sc )=1.3 T as in CePt 3 Si , CeRhSi 3 and CeIrSi 3. The large slope of H c2 at T sc , -dH c2 /dT = 18 T/K , at 5.6 GPa indicates the heavy-fermion superconductivity in CeCoGe 3.

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Tuning of Hidden Order and Superconductivity in URu2Si2 by Applied Pressure and Re Substitution

MRS Proceedings ◽

10.1557/proc-986-0986-oo02-03 ◽

2006 ◽

Vol 986 ◽

Author(s):

Nicholas P. Butch ◽

Jason R. Jeffries ◽

Benjamin T. Yukich ◽

M. Brian Maple

Keyword(s):

Single Crystals ◽

Critical Field ◽

Electrical Transport ◽

Critical Pressure ◽

Applied Pressure ◽

Ferromagnetic Phase ◽

Zero Temperature ◽

Czochralski Technique ◽

Transport Studies ◽

Hidden Order

AbstractSingle crystals of URu2-xRexSi2 have been grown via the Czochralski technique. Detailed electrical transport studies under pressure on single crystals of URu2Si2 confirm that the zero-temperature critical field is suppressed smoothly towards an extrapolated critical pressure of 15 kbar, which also corresponds to the accepted critical pressure of the hidden order phase. Improving on previous work on polycrystalline samples, studies of single crystals of URu2-xRexSi2 have provided more precise tracking of the suppression of both the hidden order phase at low doping and the ferromagnetic phase at intermediate Re concentrations.

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