Normal and superconducting properties of the magnetic superconductor URu2Si2

Ōnuki, Yoshichika; Yamazaki, Takashi; Ukon, I.; Omi, T.; Komatsubara, T.; Sakamoto, Isao; Sugiyama, Y.; Onodera, Reisho; Yonemitsu, K.; Umezawa, A.; Kwok, W. K.; Crabtree, G. W.; Hinks, D.G.

doi:10.1016/0378-4363(87)90150-1

Cited by 15 publications

(10 citation statements)

References 14 publications

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“…URu 2 Si 2 is a HFS, with the superconducting transition temperature T c ∼ 1.5 K. In addition, it shows a hidden order HO transition at T 0 ∼ 17.5 K, of which order parameter is unknown. In previous works of PCS at ambient pressure [3][4][5], the nuclear lattice relaxation rate of NMR [6], Hall coeffecient [7], etc, it was reported that a change in the density of states arises at the Fermi surface in the HO phase. In this paper, we describe a development of a new method to perform PCS under pressure and the point-contact spectra of URu 2 Si 2 in the antiferromagnetic AFM phase, which exists only under pressure [8,9].…”

Section: Introductionmentioning

confidence: 98%

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

et al. 2012

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We have developed a new method to perform point-contact spectroscopy PCS under pressure, in which a thin-film deposition technique is used for making a point contact. We investigated a pressure dependence of the point-contact spectra of the heavy-fermion superconductor URu 2 Si 2 single crystal. In PCS of URu 2 Si 2 , two characteristic components evolve at low temperatures: one is a symmetric structure with respect to zero bias voltage suggesting a gap of the density of states at the Fermi surface, and the other is an anti-symmetric structure. We observed little change of two components between hidden order and antiferromagnetic phases.

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Section: Introductionmentioning

confidence: 98%

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

et al. 2012

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“…It was known early on that the HO transition temperature T 0 increases under applied hydrostatic pressure [22][23][24][25] and that the slope increases substantially at a critical pressure of about 12 kbar [25][26][27][28][29]. It was known early on that the HO transition temperature T 0 increases under applied hydrostatic pressure [22][23][24][25] and that the slope increases substantially at a critical pressure of about 12 kbar [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

The pressure-temperature phase diagram of URu₂Si₂ under hydrostatic conditions

et al. 2010

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The pressure dependence of the hidden order phase of the heavy fermion superconductor URu 2 Si 2 has been a subject of intense research since shortly after the discovery of the compound decades ago. Applied pressure increases the critical temperature of the paramagnetic / hidden order transition and brings about a transition to long-range antiferromagnetism. The reported pressures and temperatures of these phase boundaries vary between studies: 4 -7 kbar at low temperature and 12 -15 kbar at high temperature. We review experimental evidence that the measured values of pressure and temperature are very sensitive to the chosen pressure transmitting medium. Recent x-ray diffraction measurements suggest that the relative position of the silicon atom in the unit cell is changing as a function of pressure. Recent neutron diffraction measurements show that the zero-temperature limit of the hidden order / antiferromagnetic transition occurs at pressures greater than 7.5 kbar.

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“…In some reports, the pressure medium was not disclosed [9,10,13,18,23,29,31,40,30]. It is remarkable that through the recent development of the T − P phase diagram of URu 2 Si 2 , one fact has remained mostly overlooked: the pressure studies upon which the phase diagram are based are almost exclusively performed using a 1:1 mixture of Fluorinert FC70 and FC77 that is hydrostatic only below a modest pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Despite two decades of research, current understanding of the T − P phase diagram of URu 2 Si 2 remains incomplete. Early measurements established that the HO transition temperature T 0 increases under applied hydrostatic pressure [7,8,9,10] and that the rate of change ∂T0 ∂P increases substantially at a critical pressure P c ≈ 12 kbar [3,11,12,13,14]. In contrast, the SC critical temperature T c was found to be suppressed to 0 K at a similar P c .…”

Section: Introductionmentioning

confidence: 99%

“…A survey of publications indicates that the following media have been used in studies of URu 2 Si 2 : helium [7,8,25], 1:1 n-pentane/isoamyl alcohol [11,14,19,32,33], transformer oil/kerosene [12,34,35,36], 1:1 FC70/FC77 [15,16,17,20,21,22,25,26,27,34,35,36,37,38], 4:1 methanol/ethanol [39], argon [28], and Daphne oil [38]. In some reports, the pressure medium was not disclosed [9,10,13,18,23,29,31,40,30]. It is remarkable that through the recent development of the T − P phase diagram of URu 2 Si 2 , one fact has remained mostly overlooked: the pressure studies upon which the phase diagram are based are almost exclusively performed using a 1:1 mixture of Fluorinert FC70 and FC77 that is hydrostatic only below a modest pressure.…”

Section: Introductionmentioning

confidence: 99%

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Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu₂Si₂

Butch

Jeffries

Zocco

et al. 2009

High Pressure Research

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The pressure-dependence of the hidden order phase transition of URu2Si2 is shown to depend sensitively upon the quality of hydrostatic pressure conditions during electrical resistivity measurements. Hysteresis in pressure is demonstrated for two choices of pressure medium: the commonly-used mixture of 1:1 Fluorinert FC70/FC77 and pure FC75. In contrast, no hysteresis is observed when the pressure medium is a 1:1 mixture of n-pentane/isoamyl alcohol, as it remains hydrostatic over the entire studied pressure range. Possible ramifications for the interpretation of the temperature-pressure phase diagram of URu2Si2 are discussed.

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Normal and superconducting properties of the magnetic superconductor URu2Si2

Cited by 15 publications

References 14 publications

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

The pressure-temperature phase diagram of URu₂Si₂ under hydrostatic conditions

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu₂Si₂

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Normal and superconducting properties of the magnetic superconductor URu2Si2

Cited by 15 publications

References 14 publications

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

Development of Point-Contact Spectroscopy of Heavy-Fermion Superconductors under Pressure

The pressure-temperature phase diagram of URu2Si2 under hydrostatic conditions

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu2Si2

Contact Info

Product

Resources

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The pressure-temperature phase diagram of URu₂Si₂ under hydrostatic conditions

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu₂Si₂