Skip to content
DraconiticResearch
Search Sources API
201,818 studies31 sourcesUpdated 7 min ago
PreprintCC BY 4.0arXiv

Generic thermodynamics of condensates with extremely small superfluid density ---Application to UTe2 and hidden second phase transition---

  • Kazushige Machida
Open at sourcePDFDOICite

Abstract

Motivated by recent experimental findings on UTe2 via NMR and specific heat experiments, we theoretically explore the thermodynamic signatures of condensates with small superfluid density and characterize their physical properties. We identify the hidden superconducting phase A2 composed of spin-up Cooper pairs at lower temperature (T) and field (H) under ambient pressure of UTe2 and show that A2 reappears at higher H for all three principal field directions, a, b, and c-axis. The phase transition lines from the A1 phase with spin down pairs to the A2 phase in the H-T plane are all horizontal in common, implying a universal physical origin due to the originating from the magnetic-energy gain of the spin-up pairing state with increasing magnetic field. This multiple-phase diagram is extended to these under pressure (P), resulting in a simple picture based on non-unitary spin-triplet pairing symmetry 3B3u, which enables us to consistently capture the evolution of the superconducting phases throughout the entire H-T-P phase space.

Related

  1. Thermodynamics of two-flavor isospin-asymmetric superfluid quark matter at next-to-leading order
    Tim Rehberg-Juditzky, Andreas Geißel, Jens Braun
    arXivPreprintarXiv licenceFull textHigh-energy & particle physicsarXiv
  2. Quantum gravity phenomenology in quadrupolar Bose-Einstein condensates: Finite-temperature thermodynamics and projected bounds
    Asma Tahar Taiba, Abdelaali Boudjemaa
    arXivPreprintCC BY 4.0Full textAtomic, molecular & optical physicsCondensed matterarXiv
  3. Universal scaling of fluctuations and correlations across the superfluid transition
    Paul Paquiez, Géraud Dupuy, Maxime Allemand +6
    arXivPreprintCC BY 4.0Full textAtomic, molecular & optical physicsCondensed matterarXiv
  4. Surface-condition-mediated supercooling of the A-B transition in confined superfluid helium-3
    Daksh Malhotra, Aymar Muhikira, Alexander J. Shook +1
    arXivPreprintarXiv licenceFull textCondensed matterarXiv
  5. Fermionic superfluid transition and pairing scale separation in the kagome flat band
    Xiang Li, Yu Wang
    arXivPreprintarXiv licenceFull textAtomic, molecular & optical physicsCondensed matterarXiv

Cite

BibTeXRIS
BibTeX
@misc{machida2026generic,
  title = {{Generic thermodynamics of condensates with extremely small superfluid density ---Application to UTe$_2$ and hidden second phase transition---}},
  author = {Kazushige Machida},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.19834},
  eprint = {2609.19834},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.19834},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Generic thermodynamics of condensates with extremely small superfluid density ---Application to UTe_2 and hidden second phase transition---
AU  - Kazushige Machida
PY  - 2026
DA  - 2026/09/17
PB  - arXiv
DO  - 10.48550/arxiv.2609.19834
UR  - https://arxiv.org/abs/2609.19834
AB  - Motivated by recent experimental findings on UTe_2 via NMR and specific heat experiments, we theoretically explore the thermodynamic signatures of condensates with small superfluid density and characterize their physical properties. We identify the hidden superconducting phase A_2 composed of spin-up Cooper pairs at lower temperature (T) and field (H) under ambient pressure of UTe_2 and show that A_2 reappears at higher H for all three principal field directions, a, b, and c-axis. The phase transition lines from the A_1 phase with spin down pairs to the A_2 phase in the H-T plane are all horizontal in common, implying a universal physical origin due to the originating from the magnetic-energy gain of the spin-up pairing state with increasing magnetic field. This multiple-phase diagram is extended to these under pressure (P), resulting in a simple picture based on non-unitary spin-triplet pairing symmetry ^3B_3u, which enables us to consistently capture the evolution of the superconducting phases throughout the entire H-T-P phase space.
ER  -