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Publication Date

2025-5

First Advisor

Nathanael A. Fortune

Document Type

Honors Project

Degree Name

Bachelor of Arts

Department

Physics

Keywords

specific heat, magnetic fields, condensed matter physics, experimental condensed matter, superconductivity, organic superconductors

Abstract

We present a combined thermodynamic and electromagnetic study of the quasi-two-dimensional organic superconductor β′′-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2. Using specific heat and tunnel diode oscillator (TDO) measurements, we probe the material’s low-temperature behavior under applied magnetic fields. Anomalies in the heat capacity near 6 K and 8 K are consistent with superconducting and charge-order transitions, respectively. Field-dependent measurements reveal the suppression of superconductivity and the emergence of a high-field metallic state, with at least two intermediate phases suggested by distinct thermodynamic signatures. Additional features observed in the TDO frequency response provide complementary evidence for changes in the electronic state across these transitions. The appearance of magnetic quantum oscillations above 10 T confirms the formation of a coherent metallic ground state. Taken together, our results define a complex field–temperature phase diagram and highlight the utility of TDO and calorimetric techniques in resolving subtle phase behavior in low-dimensional organic conductors.

Rights

©2025 Lily Phillips. Access limited to the Smith College community and other researchers while on campus. Smith College community members also may access from off-campus using a Smith College log-in. Other off-campus researchers may request a copy through Interlibrary Loan for personal use.

Comments

v, 64 pages : color illustrations, charts. Includes bibliographical references (pages 62-64).

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