Change of superconducting character in 
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 induced by magnetic field

Kinjo, Katsuki; Fujibayashi, Hiroki; Kitagawa, Susumu; Ishida, K.; Tokunaga, Y.; Sakai, Hironori; Kambe, S.; Nakamura, Ai; Shimizu, Yusei; Homma, Yoshiya; X., Li, D.; Honda, Fuminori; Aoki, Dai; Hiraki, K.; Kimata, Motoi; Sasaki, T.

doi:10.1103/physrevb.107.l060502

Cited by 23 publications

(9 citation statements)

References 33 publications

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“…5B) ( 17 ). As mentioned above, K b is unchanged in the HFSC state ( 16 ), as shown in Fig. 5C, indicating that the SC spin aligns to the b axis.…”

Section: Resultssupporting

confidence: 52%

“…This corresponds to the SC spin pointing to the i direction. The possible SC phases at zero field are listed in table 1 of ( 16 ). Our findings indicate that the d vector has no b component (the SC spin is oriented to the b axis) in SC2 and has a finite b component in SC3, which is the same as that of SC1.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 85%

“…For H||b, T c first decreases with increasing H and shows a minimum at around 16 T and then T c increases up to 35 T (14). The bulk SC properties in the high-field SC (HFSC) phase were recently confirmed by thermodynamic and χ ac measurements (15,16), suggesting that the pairing interaction grows up above 16 T (15). Furthermore, recent nuclear magnetic resonance (NMR) measurements revealed a tiny change of spin susceptibility just below T c for H||b and H||c (17)(18)(19), and almost no change in the a axis spin susceptibility (20).…”

Section: Introductionmentioning

confidence: 90%

“…Furthermore, recent nuclear magnetic resonance (NMR) measurements revealed a tiny change of spin susceptibility just below T c for H||b and H||c (17)(18)(19), and almost no change in the a axis spin susceptibility (20). Above 14 T for H||b, spin susceptibility remains constant below T c (16,18). These results indicate that UTe 2 is a spin-triplet superconductor with spin degrees of freedom and SC order parameter d vector, which is perpendicular to the SC spin, having the b and c components in the low-field (LF) region.…”

Section: Introductionmentioning

confidence: 99%

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Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

et al. 2023

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Superconducting (SC) state has spin and orbital degrees of freedom, and spin-triplet superconductivity shows multiple SC phases because of the presence of these degrees of freedom. However, the observation of spin-direction rotation occurring inside the SC state (SC spin rotation) has hardly been reported. Uranium ditelluride, a recently found topological superconductor, exhibits various SC phases under pressure: SC state at ambient pressure (SC1), high-temperature SC state above 0.5 gigapascal (SC2), and low-temperature SC state above 0.5 gigapascal (SC3). We performed nuclear magnetic resonance (NMR) and ac susceptibility measurements on a single-crystal uranium ditelluride. The b axis spin susceptibility remains unchanged in SC2, unlike in SC1, and decreases below the SC2-SC3 transition with spin modulation. These unique properties in SC3 arise from the coexistence of two SC order parameters. Our NMR results confirm spin-triplet superconductivity with SC spin parallel to b axis in SC2 and unveil the remaining of spin degrees of freedom in SC uranium ditelluride.

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“…5B) ( 17 ). As mentioned above, K b is unchanged in the HFSC state ( 16 ), as shown in Fig. 5C, indicating that the SC spin aligns to the b axis.…”

Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

et al. 2023

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Kinjo

2024

Springer Theses

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Theoretical Studies on Off-Axis Phase Diagrams and Knight Shifts in UTe$$_2$$: Tetra-Critical Point, d-Vector Rotation, and Multiple Phases

Machida

2024

J Low Temp Phys

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Inspired by recent remarkable sets of experiments on UTe$$_2$$ 2 : discoveries of the fourth horizontal internal transition line running toward a tetra-critical point (TCP) at H = 15 T, the off-axis high-field phases, and abnormally large Knight shift (KS) drop below $$T_\textrm{c}$$ T c for $$H \parallel a$$ H ‖ a -magnetic easy axis, we advance further our theoretical work on the field (H)-temperature (T) phase diagram for $$H \parallel b$$ H ‖ b -magnetic hard axis which contains a positive sloped $$H_\textrm{c2}$$ H c2 departing from TCP. A nonunitary spin-triplet pairing with three components explains these experimental facts simultaneously and consistently by assuming that the underlying normal electron system with a narrow bandwidth characteristic to the Kondo temperature $$\sim$$ ∼ 30 K unsurprisingly breaks the particle-hole symmetry. This causes a special invariant term in Ginzburg–Landau (GL) free energy functional which couples directly with the 5f magnetic system, giving rise to the $$T_\textrm{c}$$ T c splitting and ultimately to the positive sloped $$H_\textrm{c2}$$ H c2 and the horizontal internal transition line connected to TCP. The large KS drop can be understood in terms of this GL invariance whose coefficient is negative and leads to a diamagnetic response where the Cooper pair spin is antiparallel to the applied field direction. The present scenario also accounts for the observed d-vector rotation phenomena and off-axis phase diagrams with extremely high $$H_\textrm{c2}$$ H c2 $$\gtrsim$$ ≳ 70 T found at angles in between the b- and c-axes and between the bc-plane and a-axis, making UTe$$_2$$ 2 a fertile playground for a possible topological superconductor.

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Change of superconducting character in UTe2 induced by magnetic field

Cited by 23 publications

References 33 publications

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

Results

Theoretical Studies on Off-Axis Phase Diagrams and Knight Shifts in UTe$$_2$$: Tetra-Critical Point, d-Vector Rotation, and Multiple Phases

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Change of superconducting character in UTe2 induced by magnetic field

Cited by 23 publications

References 33 publications

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe 2

Results

Theoretical Studies on Off-Axis Phase Diagrams and Knight Shifts in UTe$$_2$$: Tetra-Critical Point, d-Vector Rotation, and Multiple Phases

Contact Info

Product

Resources

About

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂

Superconducting spin reorientation in spin-triplet multiple superconducting phases of UTe ₂